# There are two types of methods that can be deffined in python classes apart from regular methods

# classmethods and staticmethods

#

# Regular methods by default take instance of class as an argument.

#

# In classmethods we can pass class as an argument instead of an instance of the class.

# Classmethod should be used when we want particular class attribute to be changed globally meaning across the class,

# as is the case with set_raise_amount method.

#

# staticmethods are methods that do not operate on any of the class instance variables or class variables but are required in class

#

class Employee:

num_of_emps = 0

raise_amount = 1.04 # are a class variables

def __init__(self, first, last, pay):

self.first = first

self.last = last

self.pay = pay

Employee.num_of_emps += 1 # Refer to apply_raise method for explanation

def full_name(self):

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

def apply_raise(self):

self.pay = int(self.pay * self.raise_amount)

# we are defining classmethod called set_raise_amount, to define any regular method as classmethod

# we have to use '@classmethod' decorator. First argument is class and second one is amount

@classmethod

def set_raise_amount(cls, amount):

cls.raise_amount = amount

# We are defining static methods to find if day is work day or not.

# this method does not use anything from class instance

@staticmethod

def is_workday(day):

if day.weekday() == 5 or day.weekday() == 6:

return False

return True

# following statement shows using classmethod

Employee.set_raise_amount(1.05)

# below e1 and e2 are called instances of class employee

e1 = Employee('sheldon', 'cooper', 5000)

e2 = Employee('Prathamesh', 'rahate', 6000)

e1.apply_raise()

e2.apply_raise()

print(e1.pay)

print(e2.pay)

import datetime

mydate = datetime.date(2018, 12, 29)

print(Employee.is_workday(mydate))