Dynamically monkey patch a python 2.7 class

Question

Wondering if anyone has a good way to dynamically inspect a class for its function types and then dynamically monkey patch a decorator onto some of those functions.

I'm trying this but not getting the results I expect. Walking through the methods in the class seems to be working but doing the monkey patch itself seems to fail.

def decorator(callable):
    pass

class Test(object):
    def foo1(self):
        return self.bar()

    def foo2(self):
        return self.blah()

    def foo3(self):
        return 0

for x,y in Test.__dict__.items():
        if type(y) == FunctionType:
            Test.x = decorator(Test.x)

This approach of adding a decorator dynamically is totally valid. I would also prefer a better syntax by Python but for the moment it should be fine. — HelloWorld
– HelloWorld, Commented Mar 8, 2016 at 20:13

Stop harming Monica · Accepted Answer · 2016-03-08 20:29:47Z

4

Of course Test.x does not exist and this will raise AttributeError. You can use setattr for this. Also x.__dict__ looks ugly to me, I'd use vars(x) instead.

for x,y in vars(Test).items():
    if type(y) == FunctionType:
        setattr(Test, x, decorator(y))

answered Mar 8, 2016 at 20:29

Stop harming Monica

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