python►b-OOP

Python-b02-classmethod-staticmethod

This article shows the examples of classmethod and staticmethod in python

regular method

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class Employee:
    raise_amount = 2.04

    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)

    def set_regular_raise_amount(self, amount):
        self.raise_amount = amount


emp_1 = Employee('Bob', 'Gobdo', 20)
emp_2 = Employee('John', 'Youh', 30)

emp_1.set_regular_raise_amount(6)

print(emp_1.raise_amount)       # 6
print(emp_2.raise_amount)       # 2.04
print(Employee.raise_amount)    # 2.04
```  
## classmethod

class Employee:
raise_amount = 2.04

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)

def set_regular_raise_amount(self, amount):
    self.raise_amount = amount

@classmethod
def set_class_raise_amount(cls, amount):
    cls.raise_amount = amount

emp_1 = Employee(‘Bob’, ‘Gobdo’, 20)
emp_2 = Employee(‘John’, ‘Youh’, 30)

Employee.set_class_raise_amount(5)

print(emp_1.raise_amount) # 5
print(emp_2.raise_amount) # 5
print(Employee.raise_amount) # 5

1
## staticmethod

class Employee:
raise_amount = 2.04

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)

def set_regular_raise_amount(self, amount):
    self.raise_amount = amount

@classmethod
def set_class_raise_amount(cls, amount):
    cls.raise_amount = amount

@staticmethod
def is_workday(day):
    if day.weekday() == 5 or day.weekday() == 6:
        return False
    return True

import datetime
my_date = datetime.date(2016,1,2)
print(Employee.is_workday(my_date)) # False

1
## example

class A(object):
bar = 1

def func1(self):
    print('foo')

@classmethod
def func2(cls):
    print('func2')
    print(cls.bar)
    cls().func1()

@staticmethod
def func3():
    print('func3')
    print(A.bar)

A().func1() # foo
A.func2() # func2
# 1
# foo
A.func3() # func3
# 1

```