Python Oddities Explained
summary
Examples and concrete outcomes decide whether to watch: loop variable ends up as 8 after for x in numbers but a list comprehension leaves x at 0 in Python 3, using += inside a function raises an error when it makes the name local, list += mutates the list while tuple += creates a new tuple, list += with a string extends by characters, appending a list to itself makes a recursive structure, and augmented assignment first calls __iadd__ then does an assignment so mutations can happen before an assignment fails.
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