Python - Lists, Tuples, and Sets

** Python - Lists, Tuples, and Sets



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courses = ['History', 'Math', 'Physics', 'CompSci']

print(courses[0:2])

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['History', 'Math']

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courses = ['History', 'Math', 'Physics', 'CompSci']

print(courses[:2])

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['History', 'Math']

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courses = ['History', 'Math', 'Physics', 'CompSci']

print(courses[2:])


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['Physics', 'CompSci']

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courses = ['History', 'Math', 'Physics', 'CompSci']

courses.append('Art')

print(courses)

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['History', 'Math', 'Physics', 'CompSci', 'Art']

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courses = ['History', 'Math', 'Physics', 'CompSci']

courses.insert(0, 'Art')

print(courses)


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['Art', 'History', 'Math', 'Physics', 'CompSci']

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courses = ['History', 'Math', 'Physics', 'CompSci']
courses_2 = ['Art', 'Education']

courses.insert(0, courses_2)

print(courses)
print(courses[0])


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[['Art', 'Education'], 'History', 'Math', 'Physics', 'CompSci']
['Art', 'Education']


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courses = ['History', 'Math', 'Physics', 'CompSci']
courses_2 = ['Art', 'Education']

courses.extend(courses_2)

print(courses)
print(courses[0])

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['History', 'Math', 'Physics', 'CompSci', 'Art', 'Education']
History

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courses = ['History', 'Math', 'Physics', 'CompSci']
courses_2 = ['Art', 'Education']

courses.append(courses_2)

print(courses)
print(courses[4])

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['History', 'Math', 'Physics', 'CompSci', ['Art', 'Education']]
['Art', 'Education']

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courses = ['History', 'Math', 'Physics', 'CompSci']

courses.remove('Math')

print(courses)

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['History', 'Physics', 'CompSci']

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courses = ['History', 'Math', 'Physics', 'CompSci']

courses.pop()

print(courses)

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['History', 'Math', 'Physics']


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courses = ['History', 'Math', 'Physics', 'CompSci']

poped = courses.pop()

print(poped)
print(courses)


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CompSci
['History', 'Math', 'Physics']

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courses = ['History', 'Math', 'Physics', 'CompSci']

courses.reverse()

print(courses)

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['CompSci', 'Physics', 'Math', 'History']

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courses = ['History', 'Math', 'Physics', 'CompSci']

courses.sort()

print(courses)

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['CompSci', 'History', 'Math', 'Physics']

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courses = ['History', 'Math', 'Physics', 'CompSci']

nums = [1, 5, 2, 4, 3]

courses.sort()
nums.sort()

print(courses)
print(nums)

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['CompSci', 'History', 'Math', 'Physics']
[1, 2, 3, 4, 5]


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courses = ['History', 'Math', 'Physics', 'CompSci']

nums = [1, 5, 2, 4, 3]

courses.sort(reverse=True)
nums.sort(reverse=True)

print(courses)
print(nums)


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['Physics', 'Math', 'History', 'CompSci']
[5, 4, 3, 2, 1]

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courses = ['History', 'Math', 'Physics', 'CompSci']

sorted(courses)

print(courses)

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['History', 'Math', 'Physics', 'CompSci']

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courses = ['History', 'Math', 'Physics', 'CompSci']

sorted_courses = sorted(courses)

print(sorted_courses)


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['CompSci', 'History', 'Math', 'Physics']

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nums = [1, 5, 2, 4, 3]

print(min(nums))
print(max(nums))
print(sum(nums))


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1
5
15

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courses = ['History', 'Math', 'Physics', 'CompSci']

print(courses.index('CompSci'))


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3

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courses = ['History', 'Math', 'Physics', 'CompSci']

print(courses.index('Art'))


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ValueError: 'Art' is not in list

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courses = ['History', 'Math', 'Physics', 'CompSci']

print('Art' in courses)
print('Math' in courses)

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False
True

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ourses = ['History', 'Math', 'Physics', 'CompSci']

for item in courses:
print(item)

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History
Math
Physics
CompSci

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courses = ['History', 'Math', 'Physics', 'CompSci']

for course in courses:
print(course)

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History
Math
Physics
CompSci

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courses = ['History', 'Math', 'Physics', 'CompSci']

for index, course in enumerate(courses):
print(index, course)

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0 History
1 Math
2 Physics
3 CompSci

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courses = ['History', 'Math', 'Physics', 'CompSci']

for index, course in enumerate(courses, start=1):
print(index, course)


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1 History
2 Math
3 Physics
4 CompSci

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courses = ['History', 'Math', 'Physics', 'CompSci']

course_str = ', '.join(courses)

print(course_str)


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History, Math, Physics, CompSci

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courses = ['History', 'Math', 'Physics', 'CompSci']

course_str = ' - '.join(courses)

print(course_str)


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History - Math - Physics - CompSci

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courses = ['History', 'Math', 'Physics', 'CompSci']

course_str = ' - '.join(courses)

new_list = course_str.split(' - ')

print(course_str)
print(new_list)

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History - Math - Physics - CompSci
['History', 'Math', 'Physics', 'CompSci']


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list_1 = ['History', 'Math', 'Physics', 'CompSci']
list_2 = list_1


print(list_1)
print(list_2)

list_1[0] = 'Art'

print(list_1)
print(list_2)

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['History', 'Math', 'Physics', 'CompSci']
['History', 'Math', 'Physics', 'CompSci']
['Art', 'Math', 'Physics', 'CompSci']
['Art', 'Math', 'Physics', 'CompSci']

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tuple_1 = ('History', 'Math', 'Physics', 'CompSci')
tuple_2 = tuple_1


print(tuple_1)
print(tuple_2)

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('History', 'Math', 'Physics', 'CompSci')
('History', 'Math', 'Physics', 'CompSci')

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tuple_1 = ('History', 'Math', 'Physics', 'CompSci')
tuple_2 = tuple_1


print(tuple_1)
print(tuple_2)

tuple_1[0] = 'Art'

print(tuple_1)
print(tuple_2)

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('History', 'Math', 'Physics', 'CompSci')
    tuple_1[0] = 'Art'
TypeError: 'tuple' object does not support item assignment

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#Sets

cs_courses = {'History', 'Math', 'Physics', 'CompSci'}

print(cs_courses)

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{'Physics', 'CompSci', 'History', 'Math'}

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{'Physics', 'Math', 'CompSci', 'History'}

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{'Math', 'History', 'Physics', 'CompSci'}

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... 실행될 때 마다` 원소의 위치가 바뀜.

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#Sets

cs_courses = {'History', 'Math', 'Physics', 'CompSci', 'Math'}

print(cs_courses)

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{'Physics', 'History', 'CompSci', 'Math'}


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` 중복된 원소는 한 번 만 출력

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#Sets

cs_courses = {'History', 'Math', 'Physics', 'CompSci', 'Math'}

print('Math' in cs_courses)

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True

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#Sets

cs_courses = {'History', 'Math', 'Physics', 'CompSci'}
art_courses = {'History', 'Math', 'Art', 'Design'}

print(cs_courses.intersection(art_courses))
print(cs_courses.difference(art_courses))
print(art_courses.difference(cs_courses))
print(cs_courses.union(art_courses))

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{'History', 'Math'}
{'Physics', 'CompSci'}
{'Art', 'Design'}
{'History', 'Math', 'Design', 'Physics', 'CompSci', 'Art'}

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# Empty Lists
empty_list = []
empty_list = list()

# Empty Tuples
empty_tuple = ()
empty_tuple = tuple()

# Empty Sets
empty_set = {} # This isn't right! It's a dict
empty_set = set()

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