lol I forgot to put the result of the fourth example for parse_int ...

-1 byte if you remove the space after the :

oh this is not code golf? /j

tell me if it's possible to do shorter /gen

i play golf

in fact, this imports still the whole module technically speaking

lol even the syntax coloring said no

This is not worse.

1. having one function call instead of two in that kind of situation, and especially in Python which isn't the fastest language anyway, is really pointless
2. the kata assures us that b is a boolean, and this built-in type implements its __str__ method, so that's fine, there is no undetermined behavior.
3. str(b) is as clear, and more staightforward than using a conditional structure.

Well that's great this kata made me discover the existence of float.is_number()