Marco Paolini <markopaol...@gmail.com> added the comment:
also worth noting, the start argument is type checked instead. Maybe we could
apply the same checks to the items of the iterable?
python3 -c "print(sum(('a', 'b', 'c'), start='d'))"
Traceback (most recent call last):
File "<string>", line 1, in <module>
TypeError: sum() can't sum strings [use ''.join(seq) instead]
see
https://github.com/python/cpython/blob/c96d00e88ead8f99bb6aa1357928ac4545d9287c/Python/bltinmodule.c#L2310
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<https://bugs.python.org/issue41740>
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