Brandt Bucher <brandtbuc...@gmail.com> added the comment:

Prior discussion at https://bugs.python.org/issue18305. Note the final comment.

In short, this is a breaking semantic change, and the general consensus is that 
using sum for sequence concatenation is an anti-pattern.

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nosy: +brandtbucher

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<https://bugs.python.org/issue39440>
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