Python Oddities Explained
summary
Covers concrete behaviors: Python 3 only scope rules (for-loops leak loop variable, comprehensions do not), assignment versus mutation (assignments make locals; methods like list.extend mutate objects), and augmented assignment quirks where lists mutate with += but tuples/strings fall back to new objects. Demonstrates that += invokes __iadd__ then assignment, which can mutate a list inside a tuple then raise on the assignment. Uses short examples and surprising edge cases rather than abstract promises.
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