You can define a Python nested function, just initialize another function within a function by using the def
keyword. Let’s start with a code example containing a nested function:
def outer_func(): def inner_func(): print("Hello, World!") inner_func() outer_func()
Output: Hello, World!
Nested functions are used for encapsulation and closures/factory functions.
Python nested function
Simple example code.
def greeting(first, last):
# nested helper function
def f_name():
return first + " " + last
print("Hi, " + f_name() + "!")
greeting('John', 'King')
Output:

Do comment if you have any doubts or suggestions on this Python function topic.
Note: IDE: PyCharm 2021.3.3 (Community Edition)
Windows 10
Python 3.10.1
All Python Examples are in Python 3, so Maybe its different from python 2 or upgraded versions.