I was messing around with adding methods to a class instance at
runtime and saw the usual code one finds online for this. All the
examples I saw say, of course, to make sure that for your method that
you have 'self' as the first parameter. I got to thinking and thought
"I have a lot of arbitrary methods in several utility files that I
might like to add to things. How would I do that?" And this is what I
came up with:
def AddMethod(currObject, method, name = None):
if name is None: name = method.func_name
class newclass(currObject.__class__):pass
setattr(newclass, name, method)
return newclass()
And lets say I have a utility function that can check if a drive
exists on my windows box called HasDrive. I can add that like this:
superdict = addm(dict(), lambda self, d: myUtils.HasDrive(d),
"hasdrive")
and then I can call
superdict.HasDrive('c')
lambda makes it possible to add any random function because you can
use it to set self as the first parameter. I've found several real
uses for this already. My big question is, will something like this be
possible in python 3000 if lambda really does go away? I've not heard
much about lambda, reduce, etc. lately but I know Guido wanted them
out of the language.
Is there a better way to do this today than to use lambda? It seemed
the simplest way to do this that I could find.
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