Steven D'Aprano <[email protected]> added the comment:
Marco, sum should be as fast as possible, so we don't want to type check every
single element. But if it is easy enough, it might be worth checking the first
element, and if it fails, report:
cannot add 'type' to start value
where 'type' is the type of the first element. If that is str, then concatenate
(use ''.join(iterable) instead)
to the error message.
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<https://bugs.python.org/issue41740>
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