Think of PythonWin as composed of two distinct
win32ui module is a Python extension
that provides access to the raw MFC classes. For many MFC objects,
there is an equivalent
win32ui object. For
example, the functionality of the MFC
is provided by a
PyCWnd Python object; an MFC
CDocument object by a
PyCDocument object, etc. For a full list, see the
PythonWin reference (on the PythonWin help menu).
For the MFC framework to be useful, you need to be able to override
default methods in the MFC object hierarchy; for example, the method
CView::OnDraw() is generally overridden to draw
the screen for a view. But the objects exposed by the
win32ui module are technically Python types (they
aren’t classes) and a quirk in the Python language prevents
these Python types from having their methods overridden.
To this end, the
win32ui module provides a
mechanism to “attach” a Python class instance object to a
win32ui type. When MFC needs to call an overridden
method, it then calls the method on the attached Python object.
What this means for the programmer is that you can use natural Python
classes to extend the types defined in
pywin.mfc package provides Python base classes
that interface with many of the
These base classes handle the interaction with
win32ui and allow you to use Python subclassing to
get your desired behavior.
This means that when you use a PythonWin object, there are two Python objects involved (the ...