13 points•21 comments•2h ago•by rbanffy•fromscratchcode.com ↗

What `for x in y` hides from you – From Scratch Code

Python’s for x in y does not loop over the container itself but over an iterator obtained via iter(...); the loop repeatedly calls next(...) until StopIteration signals the end. The article demonstrates this with lists, strings, ranges, and generators, explains unpacking within for loops, and notes that objects can implement __iter__ and __next__ to participate in iteration.

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