I don't understand that the walrus has any significance with regards to the `while` loop termination. it's the nature of the evaluated expression that makes a difference, more precisely, whether it will return something that is cast to False.

In that sense, while loops over expressions always require knowledge of the expression to understand the semantic. On the other hand, something like:

    while True:
       with x as y:
           print(y)

would not require understanding of x to understand the intent. Therefore it is not semantically equivalent to:

    while x as y:
        print(y)

Note that in both cases, `:=` is strictly equivalent to `as` as it is defined for `with`. That is a matter of personal preference.