https://docs.djangoproject.com/en/2.1/intro/tutorial01/
https://realpython.com/best-python-books/#best-intermediate-and-advanced-python-books https://python-3-patterns-idioms-test.readthedocs.io/en/latest/index.html#
http://chriskiehl.com/article/parallelism-in-one-line/ https://www.python-course.eu/threads.php https://docs.python.org/3/library/threading.html
https://en.wikibooks.org/wiki/Python_Programming/Library_Modules
https://docs.djangoproject.com/en/2.1/topics/db/examples/many_to_many/