Python - Itertools Module : Iterator Functions for Efficient Looping

** Itertools Module : Iterator Functions for Efficient Looping

==========================================

import itertools

counter = itertools.count()

for num in counter:

print(num)

---------------------------------

0

1

2

3

... 정지 명령을 내릴때 까지 계속 1씩 증가

==========================================

==========================================

import itertools

counter = itertools.count()

print(next(counter))

---------------------------------

0

---------------------------------

import itertools

counter = itertools.count()

print(next(counter))

print(next(counter))

print(next(counter))

print(next(counter))

---------------------------------

0

1

2

3

==========================================

==========================================

import itertools

counter = itertools.count()

data = [100, 200, 300, 400]

daily_data = list(zip(itertools.count(), data))

print(daily_data)

---------------------------------

[(0, 100), (1, 200), (2, 300), (3, 400)]

==========================================

==========================================

import itertools

counter = itertools.count(start=5)

print(next(counter))

print(next(counter))

print(next(counter))

print(next(counter))

---------------------------------

5

6

7

8

---------------------------------

import itertools

counter = itertools.count(start=5, step=5)

print(next(counter))

print(next(counter))

print(next(counter))

print(next(counter))

---------------------------------

5

10

15

20

---------------------------------

import itertools

counter = itertools.count(start=5, step=-2.5)

print(next(counter))

print(next(counter))

print(next(counter))

print(next(counter))

---------------------------------

5

2.5

0.0

-2.5

==========================================

==========================================

import itertools

data = [100, 200, 300, 400]

daily_data = list(zip(range(10), data))

print(daily_data)

---------------------------------

[(0, 100), (1, 200), (2, 300), (3, 400)]

---------------------------------

import itertools

data = [100, 200, 300, 400]

daily_data = list(itertools.zip_longest(range(10), data))

print(daily_data)

---------------------------------

[(0, 100), (1, 200), (2, 300), (3, 400), (4, None), (5, None), (6, None), (7, 

None), (8, None), (9, None)]

==========================================

==========================================

import itertools

counter = itertools.cycle([1, 2, 3])

print(next(counter))

print(next(counter))

print(next(counter))

print(next(counter))

print(next(counter))

print(next(counter))

---------------------------------

1

2

3

1

2

3

---------------------------------

import itertools

counter = itertools.cycle(('On', 'Off'))

print(next(counter))

print(next(counter))

print(next(counter))

print(next(counter))

print(next(counter))

print(next(counter))

---------------------------------

On

Off

On

Off

On

Off

---------------------------------

import itertools

counter = itertools.repeat(2, times=3)

print(next(counter))

print(next(counter))

print(next(counter))

print(next(counter))

print(next(counter))

print(next(counter))

---------------------------------

2Traceback (most recent call last):

  File "C:\Users\purunet\Documents\py9\ii.py", line 9, in <module>

2

2

    print(next(counter))

StopIteration

==========================================

==========================================

import itertools

counter = itertools.repeat(2, times=3)

squares = map(pow, range(10), itertools.repeat(2))

print(list(squares))

---------------------------------

[0, 1, 4, 9, 16, 25, 36, 49, 64, 81]

---------------------------------

import itertools

counter = itertools.repeat(2, times=3)

squares = itertools.starmap(pow, [(0, 2), (1, 2), (2, 2)])

print(list(squares))

---------------------------------

[0, 1, 4]

==========================================

==========================================

import itertools

letters = ['a', 'b', 'c', 'd']

numbers = [0, 1, 2, 3]

names = ['LinuxerHAN', 'SeokDu']

result = itertools.combinations(letters, 2)

for item in result:

print(item)

---------------------------------

('a', 'b')

('a', 'c')

('a', 'd')

('b', 'c')

('b', 'd')

('c', 'd')

---------------------------------

import itertools

letters = ['a', 'b', 'c', 'd']

numbers = [0, 1, 2, 3]

names = ['LinuxerHAN', 'SeokDu']

result = itertools.permutations(letters, 2)

for item in result:

print(item)

---------------------------------

('a', 'b')

('a', 'c')

('a', 'd')

('b', 'a')

('b', 'c')

('b', 'd')

('c', 'a')

('c', 'b')

('c', 'd')

('d', 'a')

('d', 'b')

('d', 'c')

---------------------------------

import itertools

letters = ['a', 'b', 'c', 'd']

numbers = [0, 1, 2, 3]

names = ['LinuxerHAN', 'SeokDu']

result = itertools.product(numbers, repeat=4)

for item in result:

print(item)

---------------------------------

(0, 0, 0, 0)

(0, 0, 0, 1)

(0, 0, 0, 2)

(0, 0, 0, 3)

(0, 0, 1, 0)

(0, 0, 1, 1)

(0, 0, 1, 2)

(0, 0, 1, 3)

(0, 0, 2, 0)

(0, 0, 2, 1)

(0, 0, 2, 2)

(0, 0, 2, 3)

(0, 0, 3, 0)

(0, 0, 3, 1)

(0, 0, 3, 2)

(0, 0, 3, 3)

(0, 1, 0, 0)

(0, 1, 0, 1)

(0, 1, 0, 2)

(0, 1, 0, 3)

(0, 1, 1, 0)

(0, 1, 1, 1)

(0, 1, 1, 2)

(0, 1, 1, 3)

(0, 1, 2, 0)

(0, 1, 2, 1)

(0, 1, 2, 2)

(0, 1, 2, 3)

(0, 1, 3, 0)

(0, 1, 3, 1)

(0, 1, 3, 2)

(0, 1, 3, 3)

(0, 2, 0, 0)

(0, 2, 0, 1)

(0, 2, 0, 2)

(0, 2, 0, 3)

(0, 2, 1, 0)

(0, 2, 1, 1)

(0, 2, 1, 2)

(0, 2, 1, 3)

(0, 2, 2, 0)

(0, 2, 2, 1)

(0, 2, 2, 2)

(0, 2, 2, 3)

(0, 2, 3, 0)

(0, 2, 3, 1)

(0, 2, 3, 2)

(0, 2, 3, 3)

(0, 3, 0, 0)

(0, 3, 0, 1)

(0, 3, 0, 2)

(0, 3, 0, 3)

(0, 3, 1, 0)

(0, 3, 1, 1)

(0, 3, 1, 2)

(0, 3, 1, 3)

(0, 3, 2, 0)

(0, 3, 2, 1)

(0, 3, 2, 2)

(0, 3, 2, 3)

(0, 3, 3, 0)

(0, 3, 3, 1)

(0, 3, 3, 2)

(0, 3, 3, 3)

(1, 0, 0, 0)

(1, 0, 0, 1)

(1, 0, 0, 2)

(1, 0, 0, 3)

(1, 0, 1, 0)

(1, 0, 1, 1)

(1, 0, 1, 2)

(1, 0, 1, 3)

(1, 0, 2, 0)

(1, 0, 2, 1)

(1, 0, 2, 2)

(1, 0, 2, 3)

(1, 0, 3, 0)

(1, 0, 3, 1)

(1, 0, 3, 2)

(1, 0, 3, 3)

(1, 1, 0, 0)

(1, 1, 0, 1)

(1, 1, 0, 2)

(1, 1, 0, 3)

(1, 1, 1, 0)

(1, 1, 1, 1)

(1, 1, 1, 2)

(1, 1, 1, 3)

(1, 1, 2, 0)

(1, 1, 2, 1)

(1, 1, 2, 2)

(1, 1, 2, 3)

(1, 1, 3, 0)

(1, 1, 3, 1)

(1, 1, 3, 2)

(1, 1, 3, 3)

(1, 2, 0, 0)

(1, 2, 0, 1)

(1, 2, 0, 2)

(1, 2, 0, 3)

(1, 2, 1, 0)

(1, 2, 1, 1)

(1, 2, 1, 2)

(1, 2, 1, 3)

(1, 2, 2, 0)

(1, 2, 2, 1)

(1, 2, 2, 2)

(1, 2, 2, 3)

(1, 2, 3, 0)

(1, 2, 3, 1)

(1, 2, 3, 2)

(1, 2, 3, 3)

(1, 3, 0, 0)

(1, 3, 0, 1)

(1, 3, 0, 2)

(1, 3, 0, 3)

(1, 3, 1, 0)

(1, 3, 1, 1)

(1, 3, 1, 2)

(1, 3, 1, 3)

(1, 3, 2, 0)

(1, 3, 2, 1)

(1, 3, 2, 2)

(1, 3, 2, 3)

(1, 3, 3, 0)

(1, 3, 3, 1)

(1, 3, 3, 2)

(1, 3, 3, 3)

(2, 0, 0, 0)

(2, 0, 0, 1)

(2, 0, 0, 2)

(2, 0, 0, 3)

(2, 0, 1, 0)

(2, 0, 1, 1)

(2, 0, 1, 2)

(2, 0, 1, 3)

(2, 0, 2, 0)

(2, 0, 2, 1)

(2, 0, 2, 2)

(2, 0, 2, 3)

(2, 0, 3, 0)

(2, 0, 3, 1)

(2, 0, 3, 2)

(2, 0, 3, 3)

(2, 1, 0, 0)

(2, 1, 0, 1)

(2, 1, 0, 2)

(2, 1, 0, 3)

(2, 1, 1, 0)

(2, 1, 1, 1)

(2, 1, 1, 2)

(2, 1, 1, 3)

(2, 1, 2, 0)

(2, 1, 2, 1)

(2, 1, 2, 2)

(2, 1, 2, 3)

(2, 1, 3, 0)

(2, 1, 3, 1)

(2, 1, 3, 2)

(2, 1, 3, 3)

(2, 2, 0, 0)

(2, 2, 0, 1)

(2, 2, 0, 2)

(2, 2, 0, 3)

(2, 2, 1, 0)

(2, 2, 1, 1)

(2, 2, 1, 2)

(2, 2, 1, 3)

(2, 2, 2, 0)

(2, 2, 2, 1)

(2, 2, 2, 2)

(2, 2, 2, 3)

(2, 2, 3, 0)

(2, 2, 3, 1)

(2, 2, 3, 2)

(2, 2, 3, 3)

(2, 3, 0, 0)

(2, 3, 0, 1)

(2, 3, 0, 2)

(2, 3, 0, 3)

(2, 3, 1, 0)

(2, 3, 1, 1)

(2, 3, 1, 2)

(2, 3, 1, 3)

(2, 3, 2, 0)

(2, 3, 2, 1)

(2, 3, 2, 2)

(2, 3, 2, 3)

(2, 3, 3, 0)

(2, 3, 3, 1)

(2, 3, 3, 2)

(2, 3, 3, 3)

(3, 0, 0, 0)

(3, 0, 0, 1)

(3, 0, 0, 2)

(3, 0, 0, 3)

(3, 0, 1, 0)

(3, 0, 1, 1)

(3, 0, 1, 2)

(3, 0, 1, 3)

(3, 0, 2, 0)

(3, 0, 2, 1)

(3, 0, 2, 2)

(3, 0, 2, 3)

(3, 0, 3, 0)

(3, 0, 3, 1)

(3, 0, 3, 2)

(3, 0, 3, 3)

(3, 1, 0, 0)

(3, 1, 0, 1)

(3, 1, 0, 2)

(3, 1, 0, 3)

(3, 1, 1, 0)

(3, 1, 1, 1)

(3, 1, 1, 2)

(3, 1, 1, 3)

(3, 1, 2, 0)

(3, 1, 2, 1)

(3, 1, 2, 2)

(3, 1, 2, 3)

(3, 1, 3, 0)

(3, 1, 3, 1)

(3, 1, 3, 2)

(3, 1, 3, 3)

(3, 2, 0, 0)

(3, 2, 0, 1)

(3, 2, 0, 2)

(3, 2, 0, 3)

(3, 2, 1, 0)

(3, 2, 1, 1)

(3, 2, 1, 2)

(3, 2, 1, 3)

(3, 2, 2, 0)

(3, 2, 2, 1)

(3, 2, 2, 2)

(3, 2, 2, 3)

(3, 2, 3, 0)

(3, 2, 3, 1)

(3, 2, 3, 2)

(3, 2, 3, 3)

(3, 3, 0, 0)

(3, 3, 0, 1)

(3, 3, 0, 2)

(3, 3, 0, 3)

(3, 3, 1, 0)

(3, 3, 1, 1)

(3, 3, 1, 2)

(3, 3, 1, 3)

(3, 3, 2, 0)

(3, 3, 2, 1)

(3, 3, 2, 2)

(3, 3, 2, 3)

(3, 3, 3, 0)

(3, 3, 3, 1)

(3, 3, 3, 2)

(3, 3, 3, 3)

---------------------------------

import itertools

letters = ['a', 'b', 'c', 'd']

numbers = [0, 1, 2, 3]

names = ['LinuxerHAN', 'SeokDu']

result = itertools.combinations_with_replacement(numbers, 4)

for item in result:

print(item)

---------------------------------

(0, 0, 0, 0)

(0, 0, 0, 1)

(0, 0, 0, 2)

(0, 0, 0, 3)

(0, 0, 1, 1)

(0, 0, 1, 2)

(0, 0, 1, 3)

(0, 0, 2, 2)

(0, 0, 2, 3)

(0, 0, 3, 3)

(0, 1, 1, 1)

(0, 1, 1, 2)

(0, 1, 1, 3)

(0, 1, 2, 2)

(0, 1, 2, 3)

(0, 1, 3, 3)

(0, 2, 2, 2)

(0, 2, 2, 3)

(0, 2, 3, 3)

(0, 3, 3, 3)

(1, 1, 1, 1)

(1, 1, 1, 2)

(1, 1, 1, 3)

(1, 1, 2, 2)

(1, 1, 2, 3)

(1, 1, 3, 3)

(1, 2, 2, 2)

(1, 2, 2, 3)

(1, 2, 3, 3)

(1, 3, 3, 3)

(2, 2, 2, 2)

(2, 2, 2, 3)

(2, 2, 3, 3)

(2, 3, 3, 3)

(3, 3, 3, 3)

==========================================

==========================================

import itertools

letters = ['a', 'b', 'c', 'd']

numbers = [0, 1, 2, 3]

names = ['LinuxerHAN', 'SeokDu']

combined = itertools.chain(letters, numbers, names)

for item in combined:

print(item

---------------------------------

a

b

c

d

0

1

2

3

LinuxerHAN

SeokDu

==========================================

==========================================

import itertools

letters = ['a', 'b', 'c', 'd']

numbers = [0, 1, 2, 3]

names = ['LinuxerHAN', 'SeokDu']

result = itertools.islice(range(10), 5)

for item in result:

print(item)

---------------------------------

0

1

2

3

4

---------------------------------

import itertools

letters = ['a', 'b', 'c', 'd']

numbers = [0, 1, 2, 3]

names = ['LinuxerHAN', 'SeokDu']

result = itertools.islice(range(10), 1, 5)

for item in result:

print(item)

---------------------------------

0

1

2

3

4

---------------------------------

import itertools

letters = ['a', 'b', 'c', 'd']

numbers = [0, 1, 2, 3]

names = ['LinuxerHAN', 'SeokDu']

result = itertools.islice(range(10), 1, 5, 2)

for item in result:

print(item)

---------------------------------

1

3

==========================================

==========================================

import itertools

with open('test.log', 'r') as f:

header = itertools.islice(f, 3)

for line in header:

print(line)

---------test.log-------------------

Date: 2020-06-07

Author: LinuxerHAN

Description: This is a sample log file

Okay, so this is a sample entry.

I'm going to write a few more lines here.

For the sake of this video, let's pretend this log file is thousands 

and thousands of lines... okay?

---------------------------------

Date: 2020-06-07

Author: LinuxerHAN

Description: This is a sample log file

---------------------------------

import itertools

with open('test.log', 'r') as f:

header = itertools.islice(f, 3)

for line in header:

print(line)

---------test.log-------------------

Date: 2020-06-07

Author: LinuxerHAN

Description: This is a sample log file

Okay, so this is a sample entry.

I'm going to write a few more lines here.

For the sake of this video, let's pretend this log file is thousands 

and thousands of lines... okay?

---------------------------------

Date: 2020-06-07

Author: LinuxerHAN

Description: This is a sample log file

---------------------------------

import itertools

with open('test.log', 'r') as f:

header = itertools.islice(f, 3)

for line in header:

print(line, end='')

---------test.log-------------------

Date: 2020-06-07

Author: LinuxerHAN

Description: This is a sample log file

Okay, so this is a sample entry.

I'm going to write a few more lines here.

For the sake of this video, let's pretend this log file is thousands 

and thousands of lines... okay?

---------------------------------

Date: 2020-06-07

Author: LinuxerHAN

Description: This is a sample log file

==========================================

==========================================

import itertools

letters = ['a', 'b', 'c', 'd']

numbers = [0, 1, 2, 3]

names = ['LinuxerHAN', 'SeokDu']

selectors = [True, True, False, True]

result = itertools.compress(letters, selectors)

for item in result:

print(item)

---------------------------------

a

b

d

==========================================

==========================================

import itertools

def lt_2(n):

if n < 2:

return True

return False

letters = ['a', 'b', 'c', 'd']

numbers = [0, 1, 2, 3]

names = ['LinuxerHAN', 'SeokDu']

selectors = [True, True, False, True]

result = filter(lt_2, numbers)

for item in result:

print(item)

---------------------------------

0

1

---------------------------------

import itertools

def lt_2(n):

if n < 2:

return True

return False

letters = ['a', 'b', 'c', 'd']

numbers = [0, 1, 2, 3]

names = ['LinuxerHAN', 'SeokDu']

selectors = [True, True, False, True]

result = itertools.filterfalse(lt_2, numbers)

for item in result:

print(item)

---------------------------------

2

3

---------------------------------

import itertools

def lt_2(n):

if n < 2:

return True

return False

letters = ['a', 'b', 'c', 'd']

numbers = [0, 1, 2, 3, 2, 1, 0]

names = ['LinuxerHAN', 'SeokDu']

selectors = [True, True, False, True]

result = itertools.filterfalse(lt_2, numbers)

for item in result:

print(item)

---------------------------------

2

3

2

---------------------------------

import itertools

def lt_2(n):

if n < 2:

return True

return False

letters = ['a', 'b', 'c', 'd']

numbers = [0, 1, 2, 3, 2, 1, 0]

names = ['LinuxerHAN', 'SeokDu']

selectors = [True, True, False, True]

result = itertools.dropwhile(lt_2, numbers)

for item in result:

print(item)

---------------------------------

2

3

2

1

0

---------------------------------

import itertools

def lt_2(n):

if n < 2:

return True

return False

letters = ['a', 'b', 'c', 'd']

numbers = [0, 1, 2, 3, 2, 1, 0]

names = ['LinuxerHAN', 'SeokDu']

selectors = [True, True, False, True]

result = itertools.takewhile(lt_2, numbers)

for item in result:

print(item)

---------------------------------

0

1

==========================================

==========================================

import itertools

letters = ['a', 'b', 'c', 'd']

numbers = [0, 1, 2, 3, 2, 1, 0]

names = ['LinuxerHAN', 'SeokDu']

result = itertools.accumulate(numbers)

for item in result:

print(item)

---------------------------------

0

1

3

6

8

9

9

---------------------------------

import itertools

import operator

letters = ['a', 'b', 'c', 'd']

numbers = [1, 2, 3, 2, 1, 0]

names = ['LinuxerHAN', 'SeokDu']

result = itertools.accumulate(numbers, operator.mul)

for item in result:

print(item)

---------------------------------

1

2

6

12

12

0

==========================================

==========================================

import itertools

def get_state(person):

    return person['state']

people = [

    {

        'name': 'Linuxer HAN',

        'city': 'Gotham',

        'state': 'NY'

    },

    {

        'name': 'SeokDu HAN',

        'city': 'Kings Landing',

        'state': 'NY'

    },

    {

        'name': 'Corey Schafer',

        'city': 'Boulder',

        'state': 'CO'

    },

    {

        'name': 'Al Einstein',

        'city': 'Denver',

        'state': 'CO'

    },

    {

        'name': 'John Henry',

        'city': 'Hinton',

        'state': 'WV'

    },

    {

        'name': 'Randy Moss',

        'city': 'Rand',

        'state': 'WV'

    },

    {

        'name': 'Nicole K',

        'city': 'Asheville',

        'state': 'NC'

    },

    {

        'name': 'Jim Doe',

        'city': 'Charlotte',

        'state': 'NC'

    },

    {

        'name': 'Jane Taylor',

        'city': 'Faketown',

        'state': 'NC'

    }

]

person_group = itertools.groupby(people, get_state)

for key, group in person_group:

    print(key)

    for person in group:

        print(person)

    print()

---------------------------------

NY

{'name': 'Linuxer HAN', 'city': 'Gotham', 'state': 'NY'}

{'name': 'SeokDu HAN', 'city': 'Kings Landing', 'state': 'NY'}

CO

{'name': 'Corey Schafer', 'city': 'Boulder', 'state': 'CO'}

{'name': 'Al Einstein', 'city': 'Denver', 'state': 'CO'}

WV

{'name': 'John Henry', 'city': 'Hinton', 'state': 'WV'}

{'name': 'Randy Moss', 'city': 'Rand', 'state': 'WV'}

NC

{'name': 'Nicole K', 'city': 'Asheville', 'state': 'NC'}

{'name': 'Jim Doe', 'city': 'Charlotte', 'state': 'NC'}

{'name': 'Jane Taylor', 'city': 'Faketown', 'state': 'NC'}

---------------------------------

import itertools

def get_state(person):

    return person['state']

people = [

    {

        'name': 'Linuxer HAN',

        'city': 'Gotham',

        'state': 'NY'

    },

    {

        'name': 'SeokDu HAN',

        'city': 'Kings Landing',

        'state': 'NY'

    },

    {

        'name': 'Corey Schafer',

        'city': 'Boulder',

        'state': 'CO'

    },

    {

        'name': 'Al Einstein',

        'city': 'Denver',

        'state': 'CO'

    },

    {

        'name': 'John Henry',

        'city': 'Hinton',

        'state': 'WV'

    },

    {

        'name': 'Randy Moss',

        'city': 'Rand',

        'state': 'WV'

    },

    {

        'name': 'Nicole K',

        'city': 'Asheville',

        'state': 'NC'

    },

    {

        'name': 'Jim Doe',

        'city': 'Charlotte',

        'state': 'NC'

    },

    {

        'name': 'Jane Taylor',

        'city': 'Faketown',

        'state': 'NC'

    }

]

person_group = itertools.groupby(people, get_state)

for key, group in person_group:

    print(key, len(list(group)))

---------------------------------

NY 2

CO 2

WV 2

NC 3

==========================================

Python - Coding Problem: Creating Your Own Iterators

** Coding Problem: Creating Your Own Iterators


==========================================

my_sentence = Sentence('This is a test')

for word in my_sentence:
print(word)


# This should have the following output:
# This
# is
# a
# test

---------------------------------

class Sentence:

def __init__(self, sentence):
self.sentence = sentence
self.index = 0
self.words = self.sentence.split()

def __iter__(self):
return self

def __next__(self):
if self.index >= len(self.words):
raise StopIteration
index = self.index
self.index += 1
return self.words[index]


my_sentence = Sentence('This is a test')

for word in my_sentence:
print(word)

---------------------------------

This
is
a
test

==========================================
==========================================

class Sentence:

def __init__(self, sentence):
self.sentence = sentence
self.index = 0
self.words = self.sentence.split()

def __iter__(self):
return self

def __next__(self):
if self.index >= len(self.words):
raise StopIteration
index = self.index
self.index += 1
return self.words[index]


my_sentence = Sentence('This is a test')

print(next(my_sentence))
print(next(my_sentence))
print(next(my_sentence))
print(next(my_sentence))
print(next(my_sentence))

---------------------------------

is
a
test
    print(next(my_sentence))
  File "C:\Users\purunet\Documents\py9\ii.py", line 14, in __next__
    raise StopIteration
StopIteration

---------------------------------

class Sentence:

def __init__(self, sentence):
self.sentence = sentence
self.index = 0
self.words = self.sentence.split()

def __iter__(self):
return self

def __next__(self):
if self.index >= len(self.words):
raise StopIteration
index = self.index
self.index += 1
return self.words[index]

def sentence(sentence):
for word in sentence.split():
yield word


my_sentence = sentence('This is a test')


for word in my_sentence:
print(word)

---------------------------------

This
is
a
test

==========================================

Python - Iterators and Iterables : What Are They and How Do They Work?

**  Iterators and Iterables : What Are They and How Do They Work?

==========================================

nums = [1, 2, 3]

for num in nums:

print(num)

---------------------------------

1

2

3

==========================================

==========================================

nums = [1, 2, 3]

print(dir(nums))

---------------------------------

['__add__', '__class__', '__contains__', '__delattr__', '__delitem__', '__dir__', 

'__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getitem__', 

'__gt__', '__hash__', '__iadd__', '__imul__', '__init__', '__init_subclass__', 

'__iter__', '__le__', '__len__', '__lt__', '__mul__', '__ne__', '__new__', 

'__reduce__', '__reduce_ex__', '__repr__', '__reversed__', '__rmul__', 

'__setattr__', '__setitem__', '__sizeof__', '__str__', '__subclasshook__', 

'append', 'clear', 'copy', 'count', 'extend', 'index', 'insert', 'pop', 'remove', 

'reverse', 'sort']

==========================================

==========================================

nums = [1, 2, 3]

print(next(nums))

---------------------------------

  File "C:\Users\purunet\Documents\py9\ii.py", line 7, in <module>

    print(next(nums))

TypeError: 'list' object is not an iterator

==========================================

==========================================

nums = [1, 2, 3]

i_nums = nums.__iter__()

print(i_nums)

print(dir(i_nums))

---------------------------------

<list_iterator object at 0x02461D18>

['__class__', '__delattr__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', 

'__getattribute__', '__gt__', '__hash__', '__init__', '__init_subclass__', 

'__iter__', '__le__', '__length_hint__', '__lt__', '__ne__', '__new__', '__next__', 

'__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__setstate__', 

'__sizeof__', '__str__', '__subclasshook__']

==========================================

==========================================

nums = [1, 2, 3]

i_nums = iter(nums)

print(i_nums)

print(dir(i_nums))

---------------------------------

<list_iterator object at 0x00E51D18>

['__class__', '__delattr__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', 

'__getattribute__', '__gt__', '__hash__', '__init__', '__init_subclass__', 

'__iter__', '__le__', '__length_hint__', '__lt__', '__ne__', '__new__', '__next__', 

'__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__setstate__', 

'__sizeof__', '__str__', '__subclasshook__']

==========================================

==========================================

nums = [1, 2, 3]

i_nums = iter(nums)

print(next(i_nums))

---------------------------------

1

==========================================

==========================================

nums = [1, 2, 3]

i_nums = iter(nums)

print(next(i_nums))

print(next(i_nums))

print(next(i_nums))

---------------------------------

1

2

3

==========================================

==========================================

nums = [1, 2, 3]

i_nums = iter(nums)

print(next(i_nums))

print(next(i_nums))

print(next(i_nums))

print(next(i_nums))

---------------------------------

1Traceback (most recent call last):

  File "C:\Users\purunet\Documents\py9\ii.py", line 10, in <module>

2

3

    print(next(i_nums))

StopIteration

==========================================

==========================================

nums = [1, 2, 3]

i_nums = iter(nums)

while True:

try:

item = next(i_nums)

print(item)

except StopIteration:

break

---------------------------------

1

2

3

==========================================

==========================================

class MyRange:

def __init__(self, start, end):

self.value = start

self.end = end

def __iter__(self):

return self

def __next__(self):

if self.value >= self.end:

raise StopIteration

current = self.value

self.value += 1

return current

nums = MyRange(1, 10)

for num in nums:

print(num)

---------------------------------

1

2

3

4

5

6

7

8

9

==========================================

==========================================

class MyRange:

def __init__(self, start, end):

self.value = start

self.end = end

def __iter__(self):

return self

def __next__(self):

if self.value >= self.end:

raise StopIteration

current = self.value

self.value += 1

return current

nums = MyRange(1, 10)

print(next(nums))

---------------------------------

1

==========================================

==========================================

class MyRange:

def __init__(self, start, end):

self.value = start

self.end = end

def __iter__(self):

return self

def __next__(self):

if self.value >= self.end:

raise StopIteration

current = self.value

self.value += 1

return current

nums = MyRange(1, 10)

print(next(nums))

print(next(nums))

print(next(nums))

print(next(nums))

---------------------------------

1

2

3

4

==========================================

==========================================

class MyRange:

def __init__(self, start, end):

self.value = start

self.end = end

def __iter__(self):

return self

def __next__(self):

if self.value >= self.end:

raise StopIteration

current = self.value

self.value += 1

return current

def my_range(start, end):

current = start

while current < end:

yield current

current += 1

nums = my_range(1, 10)

print(next(nums))

print(next(nums))

print(next(nums))

print(next(nums))

---------------------------------

1

2

3

4

==========================================

==========================================

class MyRange:

def __init__(self, start, end):

self.value = start

self.end = end

def __iter__(self):

return self

def __next__(self):

if self.value >= self.end:

raise StopIteration

current = self.value

self.value += 1

return current

def my_range(start, end):

current = start

while current < end:

yield current

current += 1

nums = my_range(1, 10)

for num in nums:

print(num)

---------------------------------

1

2

3

4

5

6

7

8

9

==========================================

==========================================

class MyRange:

def __init__(self, start, end):

self.value = start

self.end = end

def __iter__(self):

return self

def __next__(self):

if self.value >= self.end:

raise StopIteration

current = self.value

self.value += 1

return current

def my_range(start):

current = start

while True:

yield current

current += 1

nums = my_range(1)

for num in nums:

print(num)

---------------------------------

1에서부터 시작해서, 정지명령을 내릴 때 까지 계속 1씩 증가.

==========================================

Python - 참고

** 참고


==========================================


C:\Users\purunet\Documents\Flask_Blog>pip install flask-wtf
Collecting flask-wtf
  Downloading Flask_WTF-0.14.3-py2.py3-none-any.whl (13 kB)
Collecting WTForms
  Downloading WTForms-2.3.1-py2.py3-none-any.whl (169 kB)
     |████████████████████████████████| 169 kB 327 kB/s
Requirement already satisfied: itsdangerous in c:\users\purunet\appdata\local\pr
ograms\python\python38-32\lib\site-packages (from flask-wtf) (1.1.0)
Requirement already satisfied: Flask in c:\users\purunet\appdata\local\programs\
python\python38-32\lib\site-packages (from flask-wtf) (1.1.2)
Requirement already satisfied: MarkupSafe in c:\users\purunet\appdata\local\prog
rams\python\python38-32\lib\site-packages (from WTForms->flask-wtf) (1.1.1)
Requirement already satisfied: Jinja2>=2.10.1 in c:\users\purunet\appdata\local\
programs\python\python38-32\lib\site-packages (from Flask->flask-wtf) (2.11.2)
Requirement already satisfied: click>=5.1 in c:\users\purunet\appdata\local\prog
rams\python\python38-32\lib\site-packages (from Flask->flask-wtf) (7.1.2)
Requirement already satisfied: Werkzeug>=0.15 in c:\users\purunet\appdata\local\
programs\python\python38-32\lib\site-packages (from Flask->flask-wtf) (1.0.1)
Installing collected packages: WTForms, flask-wtf
Successfully installed WTForms-2.3.1 flask-wtf-0.14.3


==========================================

C:\Users\purunet\Documents\Flask_Blog>pip install email_validator
Collecting email_validator
  Downloading email_validator-1.1.1-py2.py3-none-any.whl (17 kB)
Requirement already satisfied: idna>=2.0.0 in c:\users\purunet\appdata\local\pro
grams\python\python38-32\lib\site-packages (from email_validator) (2.9)
Collecting dnspython>=1.15.0
  Downloading dnspython-1.16.0-py2.py3-none-any.whl (188 kB)
     |████████████████████████████████| 188 kB 327 kB/s
Installing collected packages: dnspython, email-validator
Successfully installed dnspython-1.16.0 email-validator-1.1.1


==========================================

C:\Users\purunet\Documents\Flask_Blog>pip install flask_sqlalchemy
Collecting flask_sqlalchemy
  Downloading Flask_SQLAlchemy-2.4.1-py2.py3-none-any.whl (17 kB)
Collecting SQLAlchemy>=0.8.0
  Downloading SQLAlchemy-1.3.17-cp38-cp38-win32.whl (1.2 MB)
     |████████████████████████████████| 1.2 MB 364 kB/s
Requirement already satisfied: Flask>=0.10 in c:\users\purunet\appdata\local\pro
grams\python\python38-32\lib\site-packages (from flask_sqlalchemy) (1.1.2)
Requirement already satisfied: Werkzeug>=0.15 in c:\users\purunet\appdata\local\
programs\python\python38-32\lib\site-packages (from Flask>=0.10->flask_sqlalchem
y) (1.0.1)
Requirement already satisfied: itsdangerous>=0.24 in c:\users\purunet\appdata\lo
cal\programs\python\python38-32\lib\site-packages (from Flask>=0.10->flask_sqlal
chemy) (1.1.0)
Requirement already satisfied: click>=5.1 in c:\users\purunet\appdata\local\prog
rams\python\python38-32\lib\site-packages (from Flask>=0.10->flask_sqlalchemy) (
7.1.2)
Requirement already satisfied: Jinja2>=2.10.1 in c:\users\purunet\appdata\local\
programs\python\python38-32\lib\site-packages (from Flask>=0.10->flask_sqlalchem
y) (2.11.2)
Requirement already satisfied: MarkupSafe>=0.23 in c:\users\purunet\appdata\loca
l\programs\python\python38-32\lib\site-packages (from Jinja2>=2.10.1->Flask>=0.1
0->flask_sqlalchemy) (1.1.1)
Installing collected packages: SQLAlchemy, flask-sqlalchemy
Successfully installed SQLAlchemy-1.3.17 flask-sqlalchemy-2.4.1


==========================================

C:\Users\purunet\Documents\Flask_Blog>python
Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 22:45:29) [MSC v.1916 32 bit (In
tel)] on win32
Type "help", "copyright", "credits" or "license" for more information.

>>> from flaskblog import db
C:\Users\purunet\AppData\Local\Programs\Python\Python38-32\lib\site-packages\fla
sk_sqlalchemy\__init__.py:834: FSADeprecationWarning: SQLALCHEMY_TRACK_MODIFICAT
IONS adds significant overhead and will be disabled by default in the future.  S
et it to True or False to suppress this warning.
  warnings.warn(FSADeprecationWarning(

>>> db.create_all()
>>> from flaskblog import User, Post
>>> user_1 = User(username='LinuxerHAN', email='LinuxerHAN@gmail.com', password=
'password')
>>> db.session.add(user_1)
>>> user_2 = User(username='SeokDu', email='seokdu@demo.com', password='password
')
>>> db.session.add(user_2)
>>> db.session.commit()
>>> User.query.all()
[User('LinuxerHAN', 'LinuxerHAN@gmail.com', 'default.jpg'), User('SeokDu', 'seok
du@demo.com', 'default.jpg')]
>>> User.query.first()
User('LinuxerHAN', 'LinuxerHAN@gmail.com', 'default.jpg')
>>> User.query.filter_by(username='LinuxerHAN').all()
[User('LinuxerHAN', 'LinuxerHAN@gmail.com', 'default.jpg')]
>>> User.query.filter_by(username='LinuxerHAN').first()
User('LinuxerHAN', 'LinuxerHAN@gmail.com', 'default.jpg')
>>> user = User.query.filter_by(username='LinuxerHAN').first()
>>> user
User('LinuxerHAN', 'LinuxerHAN@gmail.com', 'default.jpg')
>>> user.id
1
>>> user = User.query.get(1)
>>> user
User('LinuxerHAN', 'LinuxerHAN@gmail.com', 'default.jpg')
>>> user.posts
[]
>>> user.id
1
>>> post_1 = Post(title='Blog 1', content='First Post Content!', user_id=user.id
)
>>> post_2 = Post(title='Blog 2', content='Second Post Content!', user_id=user.i
d)
>>> db.session.add(post_1)
>>> db.session.add(post_2)
>>> db.session.commit()
>>> user.posts
[Post('Blog 1', '2020-05-24 13:22:56.712866'), Post('Blog 2', '2020-05-24 13:22:
56.713867')]
>>> for post in user.posts:
...     print(post.title)
...
Blog 1
Blog 2

>>> post = Post.query.first()
>>>
>>> post
Post('Blog 1', '2020-05-24 13:22:56.712866')
>>> post.user_id
1
>>> post.author
User('LinuxerHAN', 'LinuxerHAN@gmail.com', 'default.jpg')

>>> db.drop_all()
>>> db.create_all()
>>> User.query.all()
[]
>>> Post.query.all()
[]

==========================================

C:\Users\purunet\Documents\LinuxerHAN>tree/f
폴더 PATH의 목록입니다.
볼륨 일련 번호가 B273F7ED 840E:6930입니다.
C:.
│  run.py
│
└─flaskblog
    │  forms.py
    │  models.py
    │  routes.py
    │  site.db
    │  __init__.py
    │
    ├─snippets
    │      article.html
    │      main.html
    │      navigation.html
    │
    ├─static
    │      main.css
    │
    ├─templates
    │      about.html
    │      home.html
    │      layout.html
    │      login.html
    │      register.html
    │
    └─__pycache__
            forms.cpython-38.pyc
            models.cpython-38.pyc
            routes.cpython-38.pyc
            __init__.cpython-38.pyc

==========================================

C:\Users\purunet>pip install flask-bcrypt
Collecting flask-bcrypt
  Downloading Flask-Bcrypt-0.7.1.tar.gz (5.1 kB)
Requirement already satisfied: Flask in c:\users\purunet\appdata\local\programs\
python\python38-32\lib\site-packages (from flask-bcrypt) (1.1.2)
Collecting bcrypt
  Downloading bcrypt-3.1.7-cp38-cp38-win32.whl (26 kB)
Requirement already satisfied: Jinja2>=2.10.1 in c:\users\purunet\appdata\local\
programs\python\python38-32\lib\site-packages (from Flask->flask-bcrypt) (2.11.2
)
Requirement already satisfied: click>=5.1 in c:\users\purunet\appdata\local\prog
rams\python\python38-32\lib\site-packages (from Flask->flask-bcrypt) (7.1.2)
Requirement already satisfied: itsdangerous>=0.24 in c:\users\purunet\appdata\lo
cal\programs\python\python38-32\lib\site-packages (from Flask->flask-bcrypt) (1.
1.0)
Requirement already satisfied: Werkzeug>=0.15 in c:\users\purunet\appdata\local\
programs\python\python38-32\lib\site-packages (from Flask->flask-bcrypt) (1.0.1)

Collecting cffi>=1.1
  Downloading cffi-1.14.0-cp38-cp38-win32.whl (165 kB)
     |████████████████████████████████| 165 kB 363 kB/s
Requirement already satisfied: six>=1.4.1 in c:\users\purunet\appdata\roaming\py
thon\python38\site-packages (from bcrypt->flask-bcrypt) (1.14.0)
Requirement already satisfied: MarkupSafe>=0.23 in c:\users\purunet\appdata\loca
l\programs\python\python38-32\lib\site-packages (from Jinja2>=2.10.1->Flask->fla
sk-bcrypt) (1.1.1)
Collecting pycparser
  Downloading pycparser-2.20-py2.py3-none-any.whl (112 kB)
     |████████████████████████████████| 112 kB 2.2 MB/s
Building wheels for collected packages: flask-bcrypt
  Building wheel for flask-bcrypt (setup.py) ... done
  Created wheel for flask-bcrypt: filename=Flask_Bcrypt-0.7.1-py3-none-any.whl s
ize=5017 sha256=ca1e80cdcec68bef7a093c1a06048973aa8866a5cf060e97cd27e9b8cd191001

  Stored in directory: c:\users\purunet\appdata\local\pip\cache\wheels\8a\d9\0e\
dc762c4ebc76f581397a2e25991db6efd148640b5616ab9210
Successfully built flask-bcrypt
Installing collected packages: pycparser, cffi, bcrypt, flask-bcrypt
Successfully installed bcrypt-3.1.7 cffi-1.14.0 flask-bcrypt-0.7.1 pycparser-2.2
0


==========================================

C:\Users\purunet>python
Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 22:45:29) [MSC v.1916 32 bit (In
tel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from flask_bcrypt import Bcrypt
>>> bcrypt = Bcrypt()
>>> bcrypt.generate_password_hash('testing')
b'$2b$12$mFAQ6BDudqfCpZPhMckeROvqlnaEsM5NgfwSeASq8bphdpZcCcpc.'
>>> bcrypt.generate_password_hash('testing').decode('utf-8')
'$2b$12$avJZl7.zrIANX69rakHJTO/rJ8602zoq7VXQVEb3lV8HOPFoaCCba'
>>> bcrypt.generate_password_hash('testing').decode('utf-8')
'$2b$12$pht9HoEEBCpPZdHz35wNpeGuc.27zH2lfJc.bzctjGJs2bqpoITf2'
>>> bcrypt.generate_password_hash('testing').decode('utf-8')
'$2b$12$B2euNgvatxQUY04ewJ5Jt.uk5SixLUoy28nEWnlWxNC67tTWmaVvS'

==========================================

>>> hashed_pw = bcrypt.generate_password_hash('testing').decode('utf-8')
>>> bcrypt.check_password_hash(hashed_pw, 'password')
False
>>> bcrypt.check_password_hash(hashed_pw, 'testing')
True

==========================================


C:\Users\purunet\Documents\LinuxerHAN>python
Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 22:45:29) [MSC v.1916 32 bit (In
tel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from flaskblog import db
C:\Users\purunet\AppData\Local\Programs\Python\Python38-32\lib\site-packages\fla
sk_sqlalchemy\__init__.py:834: FSADeprecationWarning: SQLALCHEMY_TRACK_MODIFICAT
IONS adds significant overhead and will be disabled by default in the future.  S
et it to True or False to suppress this warning.
  warnings.warn(FSADeprecationWarning(
>>> from flaskblog.models import User
>>> user = User.query.first()
>>> user
User('LinuxerHAN', 'LinuxerHAN@gmail.com', 'default.jpg')
>>> user.password
'$2b$12$V2KdD62Q6WJ7JBry4xTQveOjgEZjIjtlrj7KKfiwhVhh2nR5RR8CW'
>>>

==========================================


C:\Users\purunet\Documents\LinuxerHAN>pip install flask-login
Collecting flask-login
  Downloading Flask_Login-0.5.0-py2.py3-none-any.whl (16 kB)
Requirement already satisfied: Flask in c:\users\purunet\appdata\local\programs\
python\python38-32\lib\site-packages (from flask-login) (1.1.2)
Requirement already satisfied: Werkzeug>=0.15 in c:\users\purunet\appdata\local\
programs\python\python38-32\lib\site-packages (from Flask->flask-login) (1.0.1)
Requirement already satisfied: click>=5.1 in c:\users\purunet\appdata\local\prog
rams\python\python38-32\lib\site-packages (from Flask->flask-login) (7.1.2)
Requirement already satisfied: itsdangerous>=0.24 in c:\users\purunet\appdata\lo
cal\programs\python\python38-32\lib\site-packages (from Flask->flask-login) (1.1
.0)
Requirement already satisfied: Jinja2>=2.10.1 in c:\users\purunet\appdata\local\
programs\python\python38-32\lib\site-packages (from Flask->flask-login) (2.11.2)

Requirement already satisfied: MarkupSafe>=0.23 in c:\users\purunet\appdata\loca
l\programs\python\python38-32\lib\site-packages (from Jinja2>=2.10.1->Flask->fla
sk-login) (1.1.1)
Installing collected packages: flask-login
Successfully installed flask-login-0.5.0

==========================================

C:\Users\purunet\Documents\LinuxerHAN>python
Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 22:45:29) [MSC v.1916 32 bit (In
tel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from flaskblog.models import Post
C:\Users\purunet\AppData\Local\Programs\Python\Python38-32\lib\site-packages\fla
sk_sqlalchemy\__init__.py:834: FSADeprecationWarning: SQLALCHEMY_TRACK_MODIFICAT
IONS adds significant overhead and will be disabled by default in the future.  S
et it to True or False to suppress this warning.
  warnings.warn(FSADeprecationWarning(
>>> posts = Post.query.all()
>>> for post in posts:
...     print(post)
...
Post('My first Post', '2020-05-25 12:42:07.786133')
Post('A Second Post', '2020-05-25 14:07:08.138319')

>>>

==========================================

C:\Users\purunet\Documents\LinuxerHAN>python
Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 22:45:29) [MSC v.1916 32 bit (In
tel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>>
>>> s = Serializer('secret', 30)
>>> token = s.dumps({'user_id': 1}).decode('utf-8')
>>> token
'eyJhbGciOiJIUzUxMiIsImlhdCI6MTU5MDQ2MDI1NCwiZXhwIjoxNTkwNDYwMjg0fQ.eyJ1c2VyX2lk
IjoxfQ.jtMEIcCLnCQ42jUPm-AUXl0VR_jds6cdQotZ5Aifk67GuiZmaLnrQtWrpnM6QiqZUxLFeJNjk
9od8VYMk8XCog'
>>> s.loads(token)
{'user_id': 1}
>>> s.loads(token)
Traceback (most recent call last):
  File "", line 1, in
  File "C:\Users\purunet\AppData\Local\Programs\Python\Python38-32\lib\site-pack
ages\itsdangerous\jws.py", line 202, in loads
    raise SignatureExpired(
itsdangerous.exc.SignatureExpired: Signature expired
>>>

==========================================

C:\Users\purunet\Documents\LinuxerHAN>pip install flask-mail
Collecting flask-mail
  Downloading Flask-Mail-0.9.1.tar.gz (45 kB)
     |████████████████████████████████| 45 kB 68 kB/s
Requirement already satisfied: Flask in c:\users\purunet\appdata\local\programs\
python\python38-32\lib\site-packages (from flask-mail) (1.1.2)
Collecting blinker
  Downloading blinker-1.4.tar.gz (111 kB)
     |████████████████████████████████| 111 kB 547 kB/s
Requirement already satisfied: Jinja2>=2.10.1 in c:\users\purunet\appdata\local\
programs\python\python38-32\lib\site-packages (from Flask->flask-mail) (2.11.2)
Requirement already satisfied: Werkzeug>=0.15 in c:\users\purunet\appdata\local\
programs\python\python38-32\lib\site-packages (from Flask->flask-mail) (1.0.1)
Requirement already satisfied: itsdangerous>=0.24 in c:\users\purunet\appdata\lo
cal\programs\python\python38-32\lib\site-packages (from Flask->flask-mail) (1.1.
0)
Requirement already satisfied: click>=5.1 in c:\users\purunet\appdata\local\prog
rams\python\python38-32\lib\site-packages (from Flask->flask-mail) (7.1.2)
Requirement already satisfied: MarkupSafe>=0.23 in c:\users\purunet\appdata\loca
l\programs\python\python38-32\lib\site-packages (from Jinja2>=2.10.1->Flask->fla
sk-mail) (1.1.1)
Building wheels for collected packages: flask-mail, blinker
  Building wheel for flask-mail (setup.py) ... done
  Created wheel for flask-mail: filename=Flask_Mail-0.9.1-py3-none-any.whl size=
7573 sha256=1c196c8f11ccb7fab4fb811cebc030397e8c4e28f068f8d8f19785b0f2bfa156
  Stored in directory: c:\users\purunet\appdata\local\pip\cache\wheels\98\bc\8c\
34c329e4d7efeaf7b9886db0c76d0b23170e54de443f688e3c
  Building wheel for blinker (setup.py) ... done
  Created wheel for blinker: filename=blinker-1.4-py3-none-any.whl size=13455 sh
a256=42f9c6ac0dcfe0462b0d67224988cbf450eeb3c70539a14b0182a2697f174104
  Stored in directory: c:\users\purunet\appdata\local\pip\cache\wheels\b7\a5\68\
fe632054a5eadd531c7a49d740c50eb6adfbeca822b4eab8d4
Successfully built flask-mail blinker
Installing collected packages: blinker, flask-mail
Successfully installed blinker-1.4 flask-mail-0.9.1

==========================================

C:\Users\purunet\Documents\LinuxerHAN>pip install django
Requirement already satisfied: django in c:\users\purunet\appdata\local\programs
\python\python38-32\lib\site-packages (3.0.6)
Requirement already satisfied: asgiref~=3.2 in c:\users\purunet\appdata\local\pr
ograms\python\python38-32\lib\site-packages (from django) (3.2.7)
Requirement already satisfied: pytz in c:\users\purunet\appdata\local\programs\p
ython\python38-32\lib\site-packages (from django) (2020.1)
Requirement already satisfied: sqlparse>=0.2.2 in c:\users\purunet\appdata\local
\programs\python\python38-32\lib\site-packages (from django) (0.3.1)

C:\Users\purunet\Documents\LinuxerHAN>python -m django --version
3.0.6

==========================================

C:\Users\purunet\Documents\LinuxerHAN>django-admin

Type 'django-admin help ' for help on a specific subcommand.

Available subcommands:

[django]
    check
    compilemessages
    createcachetable
    dbshell
    diffsettings
    dumpdata
    flush
    inspectdb
    loaddata
    makemessages
    makemigrations
    migrate
    runserver
    sendtestemail
    shell
    showmigrations
    sqlflush
    sqlmigrate
    sqlsequencereset
    squashmigrations
    startapp
    startproject
    test
    testserver
Note that only Django core commands are listed as settings are not properly conf
igured (error: Requested setting INSTALLED_APPS, but settings are not configured
. You must either define the environment variable DJANGO_SETTINGS_MODULE or call
 settings.configure() before accessing settings.).


==========================================

C:\Users\purunet\Documents\LinuxerHAN>django-admin startproject django_project

==========================================

C:\Users\purunet\Documents\LinuxerHAN\django_project>python manage.py runserver
Watching for file changes with StatReloader
Performing system checks...

System check identified no issues (0 silenced).

You have 17 unapplied migration(s). Your project may not work properly until you
 apply the migrations for app(s): admin, auth, contenttypes, sessions.
Run 'python manage.py migrate' to apply them.
May 28, 2020 - 16:35:27
Django version 3.0.6, using settings 'django_project.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CTRL-BREAK.

==========================================

C:\Users\purunet\Documents\LinuxerHAN\django_project>python manage.py startapp blog

==========================================

C:\Users\purunet\Documents\LinuxerHAN\django_project>tree/f
폴더 PATH의 목록입니다.
볼륨 일련 번호가 7995090C 840E:6930입니다.
C:.
│  db.sqlite3
│  manage.py
│
├─blog
│  │  admin.py
│  │  apps.py
│  │  models.py
│  │  tests.py
│  │  views.py
│  │  __init__.py
│  │
│  └─migrations
│          __init__.py
│
└─django_project
    │  asgi.py
    │  settings.py
    │  urls.py
    │  wsgi.py
    │  __init__.py
    │
    └─__pycache__
            settings.cpython-38.pyc
            urls.cpython-38.pyc
            wsgi.cpython-38.pyc
            __init__.cpython-38.pyc

==========================================

https://getbootstrap.com/docs/4.0/getting-started/introduction/#starter-template

==========================================

C:\Users\purunet\Documents\LinuxerHAN\django_project>python manage.py makemigrat
ions
No changes detected

==========================================

C:\Users\purunet\Documents\LinuxerHAN\django_project>python manage.py migrate
Operations to perform:
  Apply all migrations: admin, auth, contenttypes, sessions
Running migrations:
  Applying contenttypes.0001_initial... OK
  Applying auth.0001_initial... OK
  Applying admin.0001_initial... OK
  Applying admin.0002_logentry_remove_auto_add... OK
  Applying admin.0003_logentry_add_action_flag_choices... OK
  Applying contenttypes.0002_remove_content_type_name... OK
  Applying auth.0002_alter_permission_name_max_length... OK
  Applying auth.0003_alter_user_email_max_length... OK
  Applying auth.0004_alter_user_username_opts... OK
  Applying auth.0005_alter_user_last_login_null... OK
  Applying auth.0006_require_contenttypes_0002... OK
  Applying auth.0007_alter_validators_add_error_messages... OK
  Applying auth.0008_alter_user_username_max_length... OK
  Applying auth.0009_alter_user_last_name_max_length... OK
  Applying auth.0010_alter_group_name_max_length... OK
  Applying auth.0011_update_proxy_permissions... OK
  Applying sessions.0001_initial... OK

==========================================

C:\Users\purunet\Documents\LinuxerHAN\django_project>python manage.py createsupe
ruser
Username (leave blank to use 'specialist'): LinuxerHAN
Email address: linuxerhan@gmail.com
Password:
Password (again):
This password is too short. It must contain at least 8 characters.
Bypass password validation and create user anyway? [y/N]: y
Superuser created successfully.

==========================================

C:\Users\purunet\Documents\LinuxerHAN\django_project>python manage.py makemigrat
ions
Migrations for 'blog':
  blog\migrations\0001_initial.py
    - Create model Post

==========================================

C:\Users\purunet\Documents\LinuxerHAN\django_project>python manage.py sqlmigrate
 blog 0001
BEGIN;
--
-- Create model Post
--
CREATE TABLE "blog_post" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "titl
e" varchar(100) NOT NULL, "content" text NOT NULL, "date_posted" datetime NOT NU
LL, "author_id" integer NOT NULL REFERENCES "auth_user" ("id") DEFERRABLE INITIA
LLY DEFERRED);
CREATE INDEX "blog_post_author_id_dd7a8485" ON "blog_post" ("author_id");
COMMIT;

==========================================

C:\Users\purunet\Documents\LinuxerHAN\django_project>python manage.py migrate
Operations to perform:
  Apply all migrations: admin, auth, blog, contenttypes, sessions
Running migrations:
  Applying blog.0001_initial... OK


==========================================

C:\Users\purunet\Documents\LinuxerHAN\django_project>python manage.py shell
Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 22:45:29) [MSC v.1916 32 bit (In
tel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> from blog.models import Post
>>> from django.contrib.auth.models import User
>>> User.objects.all()
, ]>
>>> User.objects.first()

>>> User.objects.filter(username='LinuxerHAN')
]>
>>> User.objects.filter(username='LinuxerHAN').first()

>>> user = User.objects.filter(username='LinuxerHAN').first()
>>> user

>>> user.id
1
>>> user.pk
1
>>> user = User.objects.get(id=1)
>>> user

>>> Post.objects.all()

>>> post_1 = Post(title='Blog 1', content='First Post Content!', author=user)
>>> Post.objects.all()

>>> post_1.save()
>>> Post.objects.all()
]>

==========================================

C:\Users\purunet\Documents\LinuxerHAN\django_project>python manage.py shell
Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 22:45:29) [MSC v.1916 32 bit (In
tel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> from blog.models import Post
>>> from django.contrib.auth.models import User
>>> Post.objects.all()
]>
>>> user = User.objects.filter(username='LinuxerHAN').first()
>>> user

>>> post_2 = Post(title='Blog 2', content='Second Post Content!', author_id=user
.id)
>>> post_2.save()
>>> Post.objects.all()
, ]>
>>> post = Post.objects.first()
>>> post.content
'First Post Content!'
>>> post.date_posted
datetime.datetime(2020, 6, 1, 10, 4, 19, 148035, tzinfo=)
>>> post.author

>>> post.author.email
'linuxerhan@gmail.com'
>>> user

>>> user.post_set
.RelatedManager object at 0x02B2D910>
>>> user.post_set.all()
, ]>
>>> user.post_set
.RelatedManager object at 0x02B2D910>
>>> user.post_set.all()
, ]>
>>> user.post_set.create(title='Blog 3', content='Third Post Content!')

>>> Post.objects.all()
, , ]>

==========================================

C:\Users\purunet\Documents\LinuxerHAN\django_project> pip install django-crispy-
forms
Requirement already satisfied: django-crispy-forms in c:\users\purunet\appdata\l
ocal\programs\python\python38-32\lib\site-packages (1.9.1)

==========================================

C:\Users\purunet\Documents\LinuxerHAN\django_project>python manage.py makemigrat
ions
No changes detected

C:\Users\purunet\Documents\LinuxerHAN\django_project>python manage.py migrate
Operations to perform:
  Apply all migrations: admin, auth, blog, contenttypes, sessions, users
Running migrations:
  Applying users.0001_initial... OK

==========================================

C:\Users\purunet\Documents\LinuxerHAN\django_project>python manage.py shell
Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 22:45:29) [MSC v.1916 32 bit (In
tel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> from django.contrib.auth.models import User
>>> user = User.objects.filter(username='LinuxerHAN').first()
>>> user

>>> user.profile

>>> user.profile.image

>>> user.profile.image.width
802
>>> user.profile.image.url
'profile_pics/default2.jpg'
>>> user = User.objects.filter(username='SeokDu').first()
>>> user

>>> user.profile.image


==========================================

>>> import json
>>> from blog.models import Post
>>> with open('posts.json') as f:
...     posts_json = json.load(f)
...
>>> for post in posts_json:
...     post = Post(title=post['title'], content=post['content'], author_id=post
['user_id'])
...     post.save()
...

==========================================

C:\Users\purunet\Documents\LinuxerHAN\django_project>python manage.py shell
Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 22:45:29) [MSC v.1916 32 bit (In
tel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
(InteractiveConsole)
>>> from django.core.paginator import Paginator
>>> posts = ['1', '2', '3', '4', '5']
>>> p = Paginator(posts, 2)
>>> p.num_pages
3
>>> for page in p.page_range:
...     print(page)
...
1
2
3
>>> p1 = p.page(1)
>>> p1

>>> p1.number
1
>>> p1.object_list
['1', '2']
>>> p1.has_previous()
False
>>> p1.has_next()
True
>>> p1.next_page_number()
2
>>> exit()


==========================================

Python - Set Methods and Operations to Solve Common Problems

** Set Methods and Operations to Solve Common Problems


==========================================

s1 = set([1, 2, 3, 4, 5])

print(s1)

---------------------------------

{1, 2, 3, 4, 5}

---------------------------------

==========================================

s1 = {1, 2, 3, 4, 5}

print(s1)

---------------------------------

{1, 2, 3, 4, 5}

---------------------------------

==========================================

s1 = set()

print(s1)

---------------------------------

set()

---------------------------------

==========================================

s1 = {1, 2, 3, 4, 5, 1, 2, 3}

print(s1)

---------------------------------

{1, 2, 3, 4, 5}

---------------------------------

==========================================

s1 = {1, 2, 3, 4, 5}
s1.add(6)
print(s1)

---------------------------------

{1, 2, 3, 4, 5, 6}

---------------------------------

==========================================

s1 = {1, 2, 3, 4, 5}
s1.update([6, 7, 8])
print(s1)

---------------------------------

{1, 2, 3, 4, 5, 6, 7, 8}

---------------------------------

==========================================

s1 = {1, 2, 3, 4, 5}
s2 = {7, 8, 9}
s1.update([6, 7, 8], s2)
print(s1)

---------------------------------

{1, 2, 3, 4, 5, 6, 7, 8, 9}

---------------------------------

==========================================

s1 = {1, 2, 3, 4, 5}
s1.remove(5)
print(s1)

---------------------------------

{1, 2, 3, 4}

---------------------------------

==========================================

s1 = {1, 2, 3, 4, 5}
s1.remove(6)
print(s1)

---------------------------------

    s1.remove(6)
KeyError: 6

---------------------------------

==========================================

s1 = {1, 2, 3, 4, 5}
s1.discard(6)
print(s1)

---------------------------------

{1, 2, 3, 4, 5}

---------------------------------

==========================================

s1 = {1, 2, 3}
s2 = {2, 3, 4}
s3 = {3, 4, 5}

s4 = s1.intersection(s2)

print(s4)

---------------------------------

{2, 3}


---------------------------------

==========================================

s1 = {1, 2, 3}
s2 = {2, 3, 4}
s3 = {3, 4, 5}

s4 = s1.intersection(s2, s3)

print(s4)

---------------------------------

{3}

---------------------------------

==========================================

s1 = {1, 2, 3}
s2 = {2, 3, 4}
s3 = {3, 4, 5}

s4 = s1.difference(s2)

print(s4)

---------------------------------

{1}

---------------------------------

==========================================

s1 = {1, 2, 3}
s2 = {2, 3, 4}
s3 = {3, 4, 5}

s4 = s2.difference(s1)

print(s4)

---------------------------------

{4}

---------------------------------

==========================================

s1 = {1, 2, 3}
s2 = {2, 3, 4}
s3 = {3, 4, 5}

s4 = s2.difference(s1, s3)

print(s4)

---------------------------------

set()

---------------------------------

==========================================

s1 = {1, 2, 3}
s2 = {2, 3, 4}
s3 = {3, 4, 5}

s4 = s3.difference(s1, s2)

print(s4)

---------------------------------

{5}

---------------------------------

==========================================


s1 = {1, 2, 3}
s2 = {2, 3, 4}
s3 = {3, 4, 5}

s4 = s1.symmetric_difference(s2)

print(s4)

---------------------------------

{1, 4}

---------------------------------

==========================================

s1 = {1, 2, 3}
s2 = {2, 3, 4}
s3 = {3, 4, 5}

s4 = s2.symmetric_difference(s1)

print(s4)

---------------------------------

{1, 4}

---------------------------------

==========================================

l1 = [1, 2, 3, 1, 2, 3]

l2 = list(set(l1))

print(l2)

---------------------------------

[1, 2, 3]

---------------------------------

==========================================

employees = ['Corey', 'Jim', 'Steven', 'April', 'Judy', 'Jenn', 'John', 'Jane']

gym_members = ['April', 'John', 'Corey']

developers = ['Judy', 'Corey', 'Steven', 'Jane', 'April']

result = set(gym_members).intersection(developers)

print(result)

---------------------------------

{'Corey', 'April'}

---------------------------------

==========================================

employees = ['Corey', 'Jim', 'Steven', 'April', 'Judy', 'Jenn', 'John', 'Jane']

gym_members = ['April', 'John', 'Corey']

developers = ['Judy', 'Corey', 'Steven', 'Jane', 'April']

result = set(employees).difference(gym_members, developers)

print(result)


---------------------------------

{'Jenn', 'Jim'}

---------------------------------

==========================================

employees = ['Corey', 'Jim', 'Steven', 'April', 'Judy', 'Jenn', 'John', 'Jane']

gym_members = ['April', 'John', 'Corey']

developers = ['Judy', 'Corey', 'Steven', 'Jane', 'April']

if 'Corey' in developers:
    print('Found!')

# O(n) for list
# O(1) for a set

---------------------------------

Found!

---------------------------------

Python - Full-Featured Web App Part 1 - Getting Started

** Full-Featured Web App Part 1 - Getting Started


==========================================

C:\Users\purunet>pip install flask
Collecting flask
  Downloading Flask-1.1.2-py2.py3-none-any.whl (94 kB)
     |████████████████████████████████| 94 kB 154 kB/s
Collecting Jinja2>=2.10.1
  Downloading Jinja2-2.11.2-py2.py3-none-any.whl (125 kB)
     |████████████████████████████████| 125 kB 656 kB/s
Collecting Werkzeug>=0.15
  Downloading Werkzeug-1.0.1-py2.py3-none-any.whl (298 kB)
     |████████████████████████████████| 298 kB 2.2 MB/s
Collecting itsdangerous>=0.24
  Downloading itsdangerous-1.1.0-py2.py3-none-any.whl (16 kB)
Collecting click>=5.1
  Downloading click-7.1.2-py2.py3-none-any.whl (82 kB)
     |████████████████████████████████| 82 kB 188 kB/s
Collecting MarkupSafe>=0.23
  Downloading MarkupSafe-1.1.1-cp38-cp38-win32.whl (16 kB)
Installing collected packages: MarkupSafe, Jinja2, Werkzeug, itsdangerous, click
, flask
Successfully installed Jinja2-2.11.2 MarkupSafe-1.1.1 Werkzeug-1.0.1 click-7.1.2
 flask-1.1.2 itsdangerous-1.1.0

==========================================

C:\Users\purunet>python
Python 3.8.2 (tags/v3.8.2:7b3ab59, Feb 25 2020, 22:45:29) [MSC v.1916 32 bit (In
tel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import flask
>>> exit()

==========================================

C:\Users\purunet\Documents\Flask_Blog>set FLASK_APP = flaskblog.py

==========================================

C:\Users\purunet\Documents\Flask_Blog>python flaskblog.py
 * Serving Flask app "flaskblog" (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployme
nt.
   Use a production WSGI server instead.
 * Debug mode: on
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 234-451-768
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
127.0.0.1 - - [23/May/2020 12:48:56] " [37mGET / HTTP/1.1 [0m" 200 -
127.0.0.1 - - [23/May/2020 12:48:56] " [33mGET /favicon.ico HTTP/1.1 [0m" 404 -
 * Detected change in 'C:\\Users\\purunet\\Documents\\Flask_Blog\\flaskblog.py',
 reloading
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 234-451-768
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
127.0.0.1 - - [23/May/2020 12:49:33] " [37mGET / HTTP/1.1 [0m" 200 -

==========================================

from flask import Flask

app = Flask(__name__)



@app.route('/')

def hello_world():

return 'Hello World!'



if __name__ == '__main__':

app.run()

---------------------------------

---------------------------------

==========================================

C:\Users\purunet\Documents\Flask_Blog>set FLASK_DEBUG=1

C:\Users\purunet\Documents\Flask_Blog>flask run
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployme
nt.
   Use a production WSGI server instead.
 * Debug mode: on
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 556-684-567
 * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit)
127.0.0.1 - - [23/May/2020 14:14:14] " [35m [1mGET / HTTP/1.1 [0m" 500 -
Traceback (most recent call last):
  File "C:\Users\purunet\AppData\Local\Programs\Python\Python38-32\Lib\site-pack
ages\flask\cli.py", line 338, in __call__
    self._flush_bg_loading_exception()
  File "C:\Users\purunet\AppData\Local\Programs\Python\Python38-32\Lib\site-pack
ages\flask\cli.py", line 326, in _flush_bg_loading_exception
    reraise(*exc_info)
  File "C:\Users\purunet\AppData\Local\Programs\Python\Python38-32\Lib\site-pack
ages\flask\_compat.py", line 39, in reraise
    raise value
  File "C:\Users\purunet\AppData\Local\Programs\Python\Python38-32\Lib\site-pack
ages\flask\cli.py", line 314, in _load_app
    self._load_unlocked()
  File "C:\Users\purunet\AppData\Local\Programs\Python\Python38-32\Lib\site-pack
ages\flask\cli.py", line 330, in _load_unlocked
    self._app = rv = self.loader()
  File "C:\Users\purunet\AppData\Local\Programs\Python\Python38-32\Lib\site-pack
ages\flask\cli.py", line 398, in load_app
    raise NoAppException(
flask.cli.NoAppException: Could not locate a Flask application. You did not prov
ide the "FLASK_APP" environment variable, and a "wsgi.py" or "app.py" module was
 not found in the current directory.
127.0.0.1 - - [23/May/2020 14:14:14] " [37mGET /?__debugger__=yes&cmd=resource&f
=style.css HTTP/1.1 [0m" 200 -
127.0.0.1 - - [23/May/2020 14:14:14] " [37mGET /?__debugger__=yes&cmd=resource&f
=debugger.js HTTP/1.1 [0m" 200 -
127.0.0.1 - - [23/May/2020 14:14:16] " [37mGET /?__debugger__=yes&cmd=resource&f
=jquery.js HTTP/1.1 [0m" 200 -
127.0.0.1 - - [23/May/2020 14:14:17] " [37mGET /?__debugger__=yes&cmd=resource&f
=console.png HTTP/1.1 [0m" 200 -
127.0.0.1 - - [23/May/2020 14:14:18] " [37mGET /?__debugger__=yes&cmd=resource&f
=ubuntu.ttf HTTP/1.1 [0m" 200 -
127.0.0.1 - - [23/May/2020 14:14:18] " [37mGET /?__debugger__=yes&cmd=resource&f
=console.png HTTP/1.1 [0m" 200 -

---------------------------------

---------------------------------

==========================================

from flask import Flask
app = Flask(__name__)


@app.route("/")
def hello():
return "

Hello World!

"


if __name__ == '__main__':
app.run(debug=True)

---------------------------------

---------------------------------

==========================================

from flask import Flask
app = Flask(__name__)


@app.route("/")
@app.route("/home")
def home():
    return "

Home Page

"


@app.route("/about")
def about():
    return "

About Page

"


if __name__ == '__main__':
    app.run(debug=True)

---------------------------------