Even though Python is seen as an easy programming language to learn, even for beginners, it’s still very useful and practical. Here is a list of some websites and software you might be familiar with that are coded either partially or entirely in Python.
YouTube

YouTube is a video hosting service available on many operating systems. It allows users to both watch videos and subscribe to other users who upload videos.
DropBox

DropBox is a file hosting service that stores documents, pictures, videos and other files on personal cloud storage that can sync between devices almost instantaneously.

Used alongside Java and C++, Python is an official language used by Google. Many core search algorithms are written in python and C++.
Instagram (Django web framework)
Instagram utilizes the world’s largest deployment of the Django web framework, which is written entirely in Python. Django is a great open source framework written on Python language. Django has made it easier for developers to build a plethora of web applications, web pages and web services.

Reddit is an American social news aggregation, web content rating, and discussion website. In 2005, Python was a more viable choice than many other programs. It was easier to read, faster to edit and shorter code in general. Python also happened to be the only other language that the development team knew besides Lisp (what reddit used to be coded in).
Civilization IV

Civilization IV is a strategy game where the player is a leader and is trying to build an empire and take over other societies. It was open to users modding the game and also wanted them to see the source code. This was facilitated by the increased readability of Python coding.
The Sims 4
The Sims 4 is the latest game in a series that allows you to create characters, forge relationships and customize their environment. It is also very open to modding so the source code is open to players to edit with Python.
GIMP

GIMP is coded in Python but it needs an extension, GIMP-Python, for users to be able to add to the code. The scripting extension allows users to use plug-ins and add extra procedures and functions to the software.