Steven D'Aprano <[email protected]> added the comment:

That's not a bug. The in-place addition `+=` for lists is equivalent to the 
extend method. See the documentation:

https://docs.python.org/3/library/stdtypes.html#mutable-sequence-types

and the tutorial:

https://docs.python.org/3/tutorial/datastructures.html

----------
nosy: +steven.daprano
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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Python tracker <[email protected]>
<https://bugs.python.org/issue39964>
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