https://medium.com/nuances-of-programming/5-%D1%81%D0%BF%D0%BE%D1%81%D0%BE%D0%B1%D0%BE%D0%B2-%D0%B2%D1%8B%D0%B9%D1%82%D0%B8-%D0%B8%D0%B7-%D0%B2%D0%BB%D0%BE%D0%B6%D0%B5%D0%BD%D0%BD%D0%BE%D0%B3%D0%BE-%D1%86%D0%B8%D0%BA%D0%BB%D0%B0-%D0%B2-python-8301fb383bde
