generic-issue.py

def foobar(number):
    return "Number is %d" % number

class GenericFoo(object):
    foo = None
    def do_things(self):
        print(self.foo(7))

class CustomFoo(GenericFoo):
    foo = foobar

cf = CustomFoo()
cf.do_things()

# Traceback (most recent call last):
#   File "generic-issue.py", line 13, in <module>
#     cf.do_things()
#   File "generic-issue.py", line 7, in do_things
#     print(self.foo(7))
# TypeError: foobar() takes 1 positional argument but 2 were given