https://ritchie46.github.io/polars/pypolars/frame.html

2020
https://ezzeddinabdullah.medium.com/
    https://medium.com/nuances-of-programming/%D0%BD%D0%BE%D0%B2%D0%B0%D1%8F-%D0%B1%D0%B8%D0%B1%D0%BB%D0%B8%D0%BE%D1%82%D0%B5%D0%BA%D0%B0-%D0%BF%D1%80%D0%B5%D0%B2%D0%BE%D1%81%D1%85%D0%BE%D0%B4%D0%B8%D1%82-pandas-%D0%BF%D0%BE-%D0%BF%D1%80%D0%BE%D0%B8%D0%B7%D0%B2%D0%BE%D0%B4%D0%B8%D1%82%D0%B5%D0%BB%D1%8C%D0%BD%D0%BE%D1%81%D1%82%D0%B8-38c65e4ee43d