[http://book.pythontips.com/en/latest/] [https://automatetheboringstuff.com/] [https://erlerobotics.gitbooks.io/erle-robotics-learning-python-gitbook-free] (python2) [https://legacy.gitbook.com/book/swaroopch/byte-of-python/details] [https://realpython.com/] [https://docs.python.org] [https://www.w3schools.com/python/python_lambda.asp]