There are so many Python tutorials available online that sometimes it is difficult to know which one to use. The quality can vary significantly and sometimes the author may be too fast or too slow or just have a style that does not work for you. The following authors are my favorites based on their speed of delivery, style of delivery, use of examples, and overall consistent quality.
Sometimes you may find that your favorite authors have not covered a particular topic area. For example, none of my preferred authors had covered (at time of writing) multithreading or multiprocessing, but I did find these tutorials.