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Learn the Python in operator with strings, lists, sets, dictionaries, ranges, generators, custom classes, not in, and efficient membership.

Learn Python list comprehensions with transformations, filters, conditions, nested loops, dictionaries, sets, generators, and style tips.

Learn to read, write, filter, validate, and transform Python CSV files with reader, writer, DictReader, DictWriter, encoding, and streaming.

Master Python slicing with start, stop, step, negative indexes, reversal, shallow copies, slice assignment, deletion, and practical examples.

Understand Python sort() vs sorted(), including mutation, custom keys, reverse order, stable sorting, multiple fields, and common mistakes.