Wrapper functions implementation in python

pre_post_wrappers.py

def wrap(pre, post):
        def decorate(func):
            def call(*args, **kwargs):
                pre(func, *args, **kwargs)
                result = func(*args, **kwargs)
                post(func, *args, **kwargs)
                return result
            return call
        return decorate

def trace_in(func, *args, **kwargs):
    print args
    print kwargs
    print "Entering function",  func.__name__

def trace_out(func, *args, **kwargs):
    print args
    print kwargs
    print "Leaving function", func.__name__

class testclass:
    def __init__(self):
        pass

    @wrap(trace_in, trace_out)
    def calc(self, x, y):
       return x + y

tc = testclass()
print tc.calc(1, 2)