Yes, that’s just a special case. You can’t call None as a function. https://docs.python.org/3/library/functions.html#filter https://docs.python.org/3/library/f

Yes, that’s just a special case. You can’t call None as a function. https://docs.python.org/3/library/functions.html#filter https://docs.python.org/3/library/functions.html#filter > If function is None, the identity function is assumed, that is, all elements of iterable that are false are removed.