Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

> Inplace operation is expected to occur only at the time when 
> the second operand is evaluated.

That expectation does not match the implementation and it likely isn't possible 
to get that to work.   In-place operations on immutable objects necessarily 
create a new object, so the operation isn't as atomic as one might expect (the 
lookup and the assignment are two separate steps).

----------
nosy: +rhettinger

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue38817>
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