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lang-py
enumeratenot incur another overhead?enumerate.rangeand indexing each time, and lower than manually tracking and updating the index separately.enumeratewith unpacking is heavily optimized (if thetuples are unpacked to names as in the provided example, it reuses the sametupleeach loop to avoid even the cost of freelist lookup, it has an optimized code path for when the index fits inssize_tthat performs cheap in-register math, bypassing Python level math operations, and it avoids indexing thelistat the Python level, which is more expensive than you'd think).for i in range(5)orfor i in range(len(ints))will do the universally common operation of iterating over an index. But if you want both the item and the index,enumerateis a very useful syntax. I use it all the time.