Python Coding Basics to Advanced

Execution: Run files with python file.py . Run quick snippets in the REPL with python .
Indentation: Blocks under if , for , while , def , and class must be indented consistently.
Comments: Use # for comments. Use docstrings for functions, classes, and modules.
Variables: Names bind to objects. You do not declare a variable type before assignment.
Truthiness: Empty strings, empty collections, 0 , and None evaluate as false.
Main guard: Use if __name__ == "__main__": when code should only run directly, not when imported.

Core syntax, data structures, functions, OOP, testing, files, typing, concurrency, APIs, and interview problem patterns

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