Wrap Callback Function To Include Extra Argument When Caller Verifies Exact Callback Signature

I'm trying to bind multiple callback functions across multiple properties with code that looks something like: for key in keys: def callback(self, value): #Do stuff...

Solution 1:

I would create a callback generator that takes your parameters (such as key) and creates your callbacks.

>>> def callback_generator(key):
...     def callback(self, value):
...         do_something_with(key, value)
...     return callback
...
>>> for key in keys:
...     doSomething(callback_generator(key))
...

Solution 2:

Minutes after I figured out that I can create a function inside the for loop to get a new stack frame. This unfortunately does not seem at all Pythonic...

for key in keys:
    def dummyForStackFrame(key): #Extra function to get a new stack frame with key
        def wrappedCallback(self, value):
            realCallback(self, key, value)
            return None
        doSomething(wrappedCallback
    dummyForStackFrame(key)