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There is no ambiguity. This example is invalid syntax.

In Python yes, but the post I responded to asked why they settled on a different assignment syntax for expressions.

It was to avoid that ambiguity (or error prone pattern, if you prefer) which is present in, say, C.

C/C++ compilers (at least, all the ones I know about) squawk about it unless you add an additional set of parentheses around the assignment.