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Python Passing a function as an argument

Last Updated : April 25, 2025

Python allows you to pass a function as an argument to another function which helps you to write flexible and reusable code.

Passing a function as an argument

You can pass a function as an argument by defining two functions and passing one function as a parameter when calling the other.

Syntax

Consider the below syntax (or, approach) to pass a function as an argument:

def func1():
    body

def func2():
    body

# Calling
func2(func1)

Example for passing a function as an argument

Here, we are defining two function foo() and koo(), function koo() will take an argument x that will be a function while calling.

The calling statement is koo(foo) - where, koo() is first function and foo() is second function. Function foo() is function as an argument here.

# defining a function
def foo():
    print("I am Foo")

# defining an another passing,
# it will take function as an argument
def koo(x):
    x()

# calling first function by passing
# second function as an argument
koo(foo)

The output of the above code will be:

I am Foo

Passing Functions as Arguments Exercise

Select the correct option to complete each statement about passing functions as arguments in Python.

1. In Python, functions are treated as ___, which means they can be passed as arguments. --Select-- first-class objects methods only static entities
2. What will def apply(f, x): return f(x) return for apply(lambda x: x ** 2, 3)? --Select-- 9 6 3
3. Which of the following correctly passes a function to another function? --Select-- process(print) process(print()) process='print'