How to Find the Length of a List in Python
Python has a built-in function len() that returns the length of a given object.
Python List reverse
In Python, there are several different ways to reverse a list, depending on what you're trying to do.
Python map() Function
The Python's map() function takes an iterable object, along with a function, and applies that function to each element in the iterable.
How to Install OpenCV on Ubuntu 20.04
This article describes how to install OpenCV on Ubuntu 20.04. OpenCV is an open-source computer vision library with bindings for C++, Python, and Java.