import inspect
import pydoc
import functools

class Base:
    def sum(self, arg1, arg2):
        "sum doc"
        return arg1 + arg2

class Child:
    def diff(self, arg1, arg2):
        "diff doc"
        return arg1 - arg2

Child.sum = functools.partialmethod(Base.sum, 17)

def main():
    c = Child()
    print(pydoc.render_doc(Child))
    print(pydoc.render_doc(c))
    print(inspect.getdoc(c.sum))
    print(inspect.getdoc(Child.sum))

if __name__ == "__main__":
    main()