On Mon, 28 Mar 2005 03:57:16 GMT, Alex VanderWoude <[EMAIL PROTECTED]> wrote:
>Is there a way to override a method on a class whose source you cannot
> change in such a way that you can hook into that method's code? After doing
> some research, it appears that one way to do such a thing is to create a new
> (non-class) method, and then assign the new method to the class in question,
> thus replacing the existing class method. However, I have read vague hints
> in the documentation that this is not a good thing to do (?). Furthermore,
> you probably need access to the source code of the method you are replacing
> so that you can duplicate and modify it in your method. Now in this
> particular case that is true, but what I really want to know is whether or
> not there is an accepted Pythonic way to do this.
>
> Here's the situation. I'm using wxPython, and I want to make an enhancement
> in the __init__ method of all the frame classes. The ideal place to do this
> is in wxFrame.__init__, since any change there will automatically be
> inherited by the other frame classes (for example, wxMDIParentFrame).
> Obviously I can inherit from wxPython and make the changes in my subclass,
> but then I would have to also subclass wxMDIParentFrame and duplicate my
> enhancements there, and then use only my subclasses rather than the wx***
> classes.
>
> Basically I want to change wxFrame.__init__ so that it looks sort of like
> this:
>
> def __init__(self, *args, **kwargs):
> # Some enhancements here.
> # The original code of this method, including the call to its
> ancestor.
> # Some more enhancements here.
>
> And then I can replace wxFrame's __init__ with my new version by assigning
> it before any frames are instantiated.
from thirdparty.project import Something
orig = Something.meth
def new(x, y, z):
foo()
orig(x, y, z)
bar()
Something.meth = new
HTH,
Jp
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