Question

I need to understand how I can access the variable that was passed to the function in the decorator.

Let me explain with an example, is it possible to do something like this:

class test(object):
    ....
    @DecoratorClass(myWrapper(self, x))
    def myFunction(self, x):
        print x
        print self.y

At some point an instance of the test-class is created, and myFunction is called from somewhere. I need to path the same argument to myWrapper.

I hope that this is clear enough.

Answer 1

The decorator replaces the function with a callable that wraps it, so the callable will be passed the same parameters as the original function. So, for example:

def Decorator(original_function):
  def replacement_function(x):
    # You now have 'x' here... do what you want with it.
  return replacement_function

@Decorator
def MyFunction(x):
   # ...

Note that you will need to delay construction of “myWrapper” until the function is executed (because you will not have the function parameter until then).