For contexts where the walrus is not allowed, see [0]. You'll find that it's generally possible to circumvent the restriction by parenthesising the expression. So yes,

    (x := 1)

is a valid (but poorly written) statement.

But while there are now two ways of doing assignment, I wonder how often people will actually encounter situations where it's difficult to figure out which choice is better.

[0] https://www.python.org/dev/peps/pep-0572/#exceptional-cases