Python - OOP(Object-Oriented Programming) Class Variables

** OOP(Object-Oriented Programming) Class Variables

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

class Employee:

def __init__(self, first, last, pay):
self.first = first
self.last = last
self.pay = pay
self.email = first + '.' + last + '@company.com'

def fullname(self):
return '{} {}'.format(self.first, self.last)

def apply_raise(self):
self.pay = int(self.pay * 1.04)


emp_1 = Employee('HAN', 'SeokDu', 50000)
emp_2 = Employee('KIM', 'Young', 30000)

print(emp_1.pay)
emp_1.apply_raise()
print(emp_1.pay)

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

50000
52000

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

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

class Employee:

raise_amount = 1.04

def __init__(self, first, last, pay):
self.first = first
self.last = last
self.pay = pay
self.email = first + '.' + last + '@company.com'

def fullname(self):
return '{} {}'.format(self.first, self.last)

def apply_raise(self):
self.pay = int(self.pay * raise_amount)


emp_1 = Employee('HAN', 'SeokDu', 50000)
emp_2 = Employee('KIM', 'Young', 30000)

print(emp_1.pay)
emp_1.apply_raise()
print(emp_1.pay)

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

   emp_1.apply_raise()

    self.pay = int(self.pay * raise_amount)
NameError: name 'raise_amount' is not defined

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

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

class Employee:

raise_amount = 1.04

def __init__(self, first, last, pay):
self.first = first
self.last = last
self.pay = pay
self.email = first + '.' + last + '@company.com'

def fullname(self):
return '{} {}'.format(self.first, self.last)

def apply_raise(self):
self.pay = int(self.pay * Employee.raise_amount)


emp_1 = Employee('HAN', 'SeokDu', 50000)
emp_2 = Employee('KIM', 'Young', 30000)

print(emp_1.pay)
emp_1.apply_raise()
print(emp_1.pay)


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

50000
52000

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

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

class Employee:

raise_amount = 1.04

def __init__(self, first, last, pay):
self.first = first
self.last = last
self.pay = pay
self.email = first + '.' + last + '@company.com'

def fullname(self):
return '{} {}'.format(self.first, self.last)

def apply_raise(self):
self.pay = int(self.pay * self.raise_amount)


emp_1 = Employee('HAN', 'SeokDu', 50000)
emp_2 = Employee('KIM', 'Young', 30000)

print(emp_1.pay)
emp_1.apply_raise()
print(emp_1.pay)


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

50000
52000

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

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

class Employee:

raise_amount = 1.04

def __init__(self, first, last, pay):
self.first = first
self.last = last
self.pay = pay
self.email = first + '.' + last + '@company.com'

def fullname(self):
return '{} {}'.format(self.first, self.last)

def apply_raise(self):
self.pay = int(self.pay * self.raise_amount)


emp_1 = Employee('HAN', 'SeokDu', 50000)
emp_2 = Employee('KIM', 'Young', 30000)


print(Employee.raise_amount)
print(emp_1.raise_amount)
print(emp_2.raise_amount)

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

1.04
1.04
1.04

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

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

class Employee:

raise_amount = 1.04

def __init__(self, first, last, pay):
self.first = first
self.last = last
self.pay = pay
self.email = first + '.' + last + '@company.com'

def fullname(self):
return '{} {}'.format(self.first, self.last)

def apply_raise(self):
self.pay = int(self.pay * self.raise_amount)


emp_1 = Employee('HAN', 'SeokDu', 50000)
emp_2 = Employee('KIM', 'Young', 30000)



print(emp_1.__dict__)
print("-"*80)
print(Employee.__dict__)

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

{'first': 'HAN', 'last': 'SeokDu', 'pay': 50000, 'email': 'HAN.SeokDu@company.com'}
--------------------------------------------------------------------------------
{'__module__': '__main__', 'raise_amount': 1.04, '__init__': , 'fullname': , 'apply_raise': , '__dict__': , '__weakref__': , '__doc__': None}
---------------------------------

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

class Employee:

raise_amount = 1.04

def __init__(self, first, last, pay):
self.first = first
self.last = last
self.pay = pay
self.email = first + '.' + last + '@company.com'

def fullname(self):
return '{} {}'.format(self.first, self.last)

def apply_raise(self):
self.pay = int(self.pay * self.raise_amount)


emp_1 = Employee('HAN', 'SeokDu', 50000)
emp_2 = Employee('KIM', 'Young', 30000)




emp_1.raise_amount = 1.05

print(Employee.raise_amount)
print(emp_1.raise_amount)
print(emp_2.raise_amount)

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

1.04
1.05
1.04

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

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

class Employee:

raise_amount = 1.04

def __init__(self, first, last, pay):
self.first = first
self.last = last
self.pay = pay
self.email = first + '.' + last + '@company.com'

def fullname(self):
return '{} {}'.format(self.first, self.last)

def apply_raise(self):
self.pay = int(self.pay * self.raise_amount)


emp_1 = Employee('HAN', 'SeokDu', 50000)
emp_2 = Employee('KIM', 'Young', 30000)

emp_1.raise_amount = 1.05

print(emp_1.__dict__)

print(Employee.raise_amount)
print(emp_1.raise_amount)
print(emp_2.raise_amount)

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

{'first': 'HAN', 'last': 'SeokDu', 'pay': 50000, 'email': 'HAN.SeokDu@company.com', 'raise_amount': 1.05}
1.04
1.05
1.04

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

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

class Employee:

num_of_emps = 0
raise_amount = 1.04

def __init__(self, first, last, pay):
self.first = first
self.last = last
self.pay = pay
self.email = first + '.' + last + '@company.com'

Employee.num_of_emps += 1

def fullname(self):
return '{} {}'.format(self.first, self.last)

def apply_raise(self):
self.pay = int(self.pay * self.raise_amount)


print(Employee.num_of_emps)

emp_1 = Employee('HAN', 'SeokDu', 50000)
emp_2 = Employee('KIM', 'Young', 30000)

print(Employee.num_of_emps)

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

0
2

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