Question

I have two classes:

class Base(object):
  def __init__(self):
    object.__init__(self)

  def print_methods(self):
    print self.__dict__

class Child(Base):
   def __init__(self):
     Base.__init__(self)

   def another_method(self):
     pass

Now I can to call the print_method in a Child instance, and expecting to see the another_method. But failed.

Answer 1

This is not related to inheritance at all. Child.another_method() is an attribute of the class, not the instance, so it’s not in the __dict__ of self, but rather in the dict of Child. If you create an instance of Base only and call print_methods() on this instance, you won’t see print_methods as well.

To find all methods of an instance, you can use dir() or inspect.getmembers() (possible in combination with callable() to only include the callable attributes).