first_class_functions_in_python.md

First class functions in python

Functions are objects:

def shout(text): 
    return text.upper() 
  
print shout('Hello') 
  
yell = shout 
  
print yell('Hello') 

Functions can be passed as arguments to other functions:

def shout(text): 
    return text.upper() 
  
def whisper(text): 
    return text.lower() 
  
def greet(func): 
    # storing the function in a variable 
    greeting = func("Hi, I am created by a function passed as an argument.") 
    print greeting  
  
greet(shout) 
greet(whisper) 

Functions can return another function:

def create_adder(x): 
    def adder(y): 
        return x+y 
  
    return adder 
  
add_15 = create_adder(15) 
  
print add_15(10) 

Detailed Ref : https://www.geeksforgeeks.org/first-class-functions-python/