gistfile1.py

def mydec(c, f):
    def r_dec(function):
        def wrapper(*args, **kwargs):
            print "## PRE-RUN CODE HERE ##"
            getattr(c(), f)(*args[1:], **kwargs)
            print "## POST-RUN CODE HERE ##"
        return wrapper
    return r_dec


class B:
    def func1(self, a, b, c):
        print "B::func1 %s %s %s" % (a, b, c)

class A:
    @mydec(B, "func1")
    def func1(self, a, b, c):
        print "A::func1 %s %s %s" % (a, b, c)


print "Calling original B.func1 (unwrapped)"
y = B()
y.func1(1, 2, 3)
print "---"
print "Calling A.func1 wrapping B.func1"
x = A()
x.func1(1, 2, 3)