Python：import.class中的未绑定方法__init __（）

Question

I'm trying to subclass a class from another python script.

I've done the following when subclassing from within the same file, and it works.

widge.py
    class widget(object):
        def __init__(self,bob):
            #do something

    class evenWidgetier(widget):
        def __init__(self, bob):
            widget.__init__(self,bob)
            #do something

But once I add in inheritance from another file..

superWidget.py

    import widge
    class superWidgety(widge.evenWidgetier):
        def __init__(self, bob):
            widge.widget.__init__(self,bob)
            #do something

I get an error:

unbound method __init__() must be called with widget instance as first argument

Is there a way I can subclass a class from another package that works?

.

And out of curiosity, what's the deal? Substantively this looks identical to me. I can call a class from another file by using the widge.widget(), so that method seems established. And I can subclass when the class is in the same file by referencing the class in the declaration. What is it about using a class from an import in a declaration that breaks? Why does it see itself as the right method when in the same file, but sees itself as an unbound method when imported?

The specifically, my code is this (stripping the parts that shouldn't affect this.

Attributor.py
    class Tracker(object):
        def __init__(self, nodeName=None, dag=None):
            #Tracking stuff

    class Transform(Tracker):
        #Does stuff with inherited class

timeline_tab.py
    import Attributor as attr

    class timeline(attr.Transform):
        #some vars
        def __init__(self, nodeName=None):
            attr.Transform.__init__(self,nodeName=nodeName)
            #Additional init stuff, but doesn't happen because error on previous line

Answer 1

In superWidget.py change the SuperWidget to use super

    import widge
    class superWidgety(widge.evenWidgetier):
        def __init__(self, bob):
            super(SuperWidget,self).__init__(bob)
            #do something