Getting module path string from a class instance

[Some Developer]

I'm trying to find a way to get a string of the module path of a class.

So for instance say I have class Foo and it is in a module called 
my.module. I want to be able to get a string that is equal to this: 
"my.module.Foo". I'm aware of the __repr__ method but it does not do 
what I want it to do in this case.

Can anyone offer any advice at all?