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classmethod() in Python
A class method receives the class itself as its first argument. This way we are able to call the method inside a class without first creating an instance from the class. We just use the decorator @classmethod before the declaration of the method contained in the class and then we can directly access the method. Below are the main features of classmethids.
A classmethod is bound to a class and does not depend on the instantiation of a class to be used.
A classmethod can modify a class which in turn propagates to all instances of the class.
Using the classmethod
In the below example we create a class called WeekDay and create a method in it called daynames. Then we access this method without first instantiating the class which means without creating any object from the class.
Example
class WeekDay:
day_name = ['Mon','Tue','Wed','Thu','Fri']
# Applying the class method
@classmethod
def daynames(n):
print('The WeekDays are', n.day_name)
WeekDay.daynames()
# OR
WeekDay().daynames()Output
Running the above code gives us the following result −
The WeekDays are ['Mon', 'Tue', 'Wed', 'Thu', 'Fri'] The WeekDays are ['Mon', 'Tue', 'Wed', 'Thu', 'Fri']
Without using the classmethod
To achieve the same result without a classmethod we can declare the method without a class. This shows the reason for which we need the class method.
Example
def daynames():
day_name = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri']
print('The WeekDays are', day_name)
daynames()Output
Running the above code gives us the following result −
The WeekDays are ['Mon', 'Tue', 'Wed', 'Thu', 'Fri']
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