[issue25549] call sum on list of timedelta throws TypeError

[sedrubal]

sedrubal <python at sedrubal.de> added the comment:

What is the reason for this start parameter? Why will sum not just use the first entry of the input sequence?

I think at least a error message that points programmers into the right direction was very helpful.

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nosy: +sedrubal

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue25549>
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