Python: Zero to Hero

A complete beginner-to-professional Python course in 20 chapters, built to be read top to bottom in one sitting — how Python runs, variables and data types, operators, strings, lists and tuples, dictionaries and sets, conditionals, loops, functions, error handling, file I/O, modules/packages/pip, object-oriented programming, comprehensions and lambdas, scope and copy gotchas, and the standard library, followed by a mini command-line to-do app project, a cheat sheet, and the common beginner mistakes to avoid.