"x += 1" in Python is a statement, not an expression, so that's a SyntaxError. But I suppose you would run into this kind of ambiguity with the walrus operator

"x += 1" in Python is a statement, not an expression, so that's a SyntaxError. But I suppose you would run into this kind of ambiguity with the walrus operator, i.e. >>> x = 5 >>> f = lambda a, b: (a, b) >>> print(f(x := x + 1, x := x + 1)) (6, 7) PEP 572 appears[1] to specify that the evaluation order should always be left to right. [1] https://www.python.org/dev/peps/pep-0572/#change-to-evaluation-order https://www.python.org/dev/peps/pep-0572/#change-to-evaluati...