Is there any cheat sheet for opencv-python? : <p>I've been working on face tracking turret with OpenCV_Python version 4.1.0, but I don't know a lot of commands and functions. So I tried to look up Google or other documentation to see if there's any cheat sheet for OpenCV_Python that has all the possible functions and brief explanations about them. </p>

<p>I only found a cheat sheet for OpenCV_C++ version 2.7.0, but couldn't find any cheat sheet for OpenCV_Python. </p>

<p>I saw the official OpenCV 3.0.0 documentation for Python as well, but that only shows few functions for general things you can do. </p>

<p>Is there any source or document(or book) that I can learn all the possible functions of OpenCV_Python?</p>
