Feedback on module

[Gribouillis]

Function arguments are seldom checked in python, but there is a place where they are often checked: the standard library! (at least the functions implemented in C). So we cannot say that this is fundamentally unpythonic. It depends on the use case. I would check what the values should be rather than what they should not be, so for example, with more explicit name and message

from numbers import Number

def _fail_unless_non_negative_number(*kwargs):
    for k, v in kwargs.items():
        if not (isinstance(v, Number) and (v >= 0)):
            raise TypeError(('Expected non negative number for parameter', k, 'got', repr(v)))