Question

I am trying to apply the timing decorator described here to a method within a class instead of a standalone method. How should this be done?

I am getting this error:

TypeError: unbound method wrapper() must be called with SomeClass instance as
first argument (got float instance instead)

Answer 1

EDIT

Thanks to your comment, I think I know what the problem is. This doesn’t work:

class A:

    @timings
    @classmethod
    def a(cls, x):
       print(x)

A.a(2)

for exactly the reason you said.
TypeError: unbound method wrapper() must be called with A instance as first argument (got int instance instead)

But this does:

class A:

    @classmethod
    @timings
    def a(cls, x):
        print(x)

A.a(2)

So the order matters. I think what’s going on here is that it’s fooling the way python handles bound methods: When python looks at the member a, it has to make a decision:

1. Make a bound method
2. Make a class method
3. Do nothing (leave it as it is)

If it gets a regular function, it will do (1), and @timings produces a regular function.

Does this solve the problem?