@acaccia

OK I see now in the 2.7 documentation. My mistake, thanks for the help.

If iterable is a string or a tuple, the result also has that type; otherwise it is always a list.

How can int accept the result from filter? int requires a number or string, and filter returns a list.

TypeError: int() argument must be a string, a bytes-like object or a number, not 'filter'

Test cases are incorrect