Adam Cmiel added the comment:
Got it, I didn't realize that the last step of augmented assignment is (in this
case) assigning the result of __iadd__ back to the tuple.
Thanks for the explanations!
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Python tracker
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New submission from Adam Cmiel :
Python version:
Python 3.8.3 (default, May 15 2020, 00:00:00)
[GCC 10.1.1 20200507 (Red Hat 10.1.1-1)] on linux
Description:
When assigning to a tuple index using +=, if the element at that index is a
list, the list is extended and a TypeError is raised
