What is monkey patching in Python?

It is a dynamic (run-time) technique in Python by which you can modify the behavior of an existing class or module.

In short words refers to dynamic modifications of a class or module at run-time.

Monkey patching can only be done in dynamic languages.

Example - Monkey Patching Python Class:

class monkey:
    def monkeyFunc(self):
        print("my function")
         
def patchFunc():
    print("patching on monkey")
     
 
#normal class method call
objMonkey= monkey()
objMonkey.monkeyFunc()
 
#calling class method after monkey patch
objMonkey.monkeyFunc=patchFunc
objMonkey.monkeyFunc()

# Output:
my function
patching on monkey

Additional information

Dynamic programming language

In computer science, a dynamic programming language is a class of high-level programming languages, which at runtime execute many common programming behaviors that static programming languages perform during compilation.

Reference

Monkey Patching in Python

Dynamic programming language

What’s the use of monkey patching?