Python is one of the world's most popular programming languages — simple to read, powerful, and used everywhere from web development to AI. This topic introduces Python basics: printing, variables, data types, input, and arithmetic.
Python is free — install from python.org or use online editors (replit.com). Interactive mode: type code, see result immediately (REPL). Script mode: write in a file (.py), run together. First program: print("Hello, World!"). Comments: # this is ignored by Python. Python uses indentation (spaces) instead of braces {} — very important!
Variable: a named container for data. name = "Alice" (string), age = 12 (integer), height = 4.5 (float), is_student = True (boolean). input() gets user input (always returns string). Convert: int("5") → 5, float("3.14") → 3.14. Operators: + (add), − (subtract), * (multiply), / (divide), // (integer divide), % (remainder), ** (power).
Python is the most popular programming language for beginners and professionals. Reasons: (1) Simple, English-like syntax — easy to read and write. (2) Huge ecosystem — web development (Django), AI/ML (TensorFlow, PyTorch), data science (Pandas), automation. (3) High demand in jobs. (4) Free and open source. (5) Used by Google, NASA, Netflix, Instagram and thousands of companies.
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