Python Decorators

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A Python Decorator provides a concise and reusable way for extending a function or a class.

A Python Decorator provides a concise and reusable way for extending

a function or a class.

A decorator in its simplest form is a function that takes another function as an argument and returns a wrapper. The following example shows the creation of a decorator and its usage.

A decorator in its simplest form is a function that takes another

function as an argument and returns a wrapper. The following example

shows the creation of a decorator and its usage.

defyour_decorator(func):

This template is useful for most decorator use-cases. It is valid for functions with or without parameters, and with or without a return value.

This template is useful for most decorator use-cases. It is valid for functions

with or without parameters, and with or without a return value.

import functools

A decorator can also be defined as a class instead of a method. This is useful for maintaining and updating a state, such as in the following example, where we count the number of calls made to a method:

To decorate a class methos, you must define the decorator within the class. When

only the implicit argument`self` is passed to the method, without any other

additional arguments, you must make a separate decorator for only those methods

without any additional arguments. An example of this is when you want to catch

and print exceptions in a certain way.

classDecorateMyMethod:

defdecorator_for_class_method_with_no_args(method):

defwrapper_for_class_method(self)

try:

return method(self)

exceptExceptionas e:

print("\nWARNING: Please make note of the following:\n")

print(e)

return wrapper_for_class_method

def__init__(self,succeed:bool):

self.succeed= succeed

defclass_action(self):

ifself.succeed:

print("You succeeded by choice.")

else:

raiseException("Epic fail of your own creation.")

test_succeed= DecorateMyMethods(True)

test_succeed.class_action()

test_fail= DecorateMyMethod(False)

test_fail.class_action()

A decorator can also be defined as a class instead of a method. This is useful

for maintaining and updating a state, such as in the following example, where we

count the number of calls made to a method:

classCountCallNumber: