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python-patterns/decorator.py at master · slunk/python-patterns · GitHub

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# http://stackoverflow.com/questions/3118929/implementing-the-decorator-pattern-in-python

class foo_decorator(object):

def __init__(self, decoratee):

self._decoratee = decoratee

def f1(self):

print("decorated f1")

self._decoratee.f1()

def __getattr__(self, name):

return getattr(self._decoratee, name)

class undecorated_foo(object):

def f1(self):

print("original f1")

def f2(self):

print("original f2")

@foo_decorator

class decorated_foo(object):

def f1(self):

print("original f1")

def f2(self):

print("original f2")

def main():

u = undecorated_foo()

v = foo_decorator(u)

# The @foo_decorator syntax is just shorthand for calling

# foo_decorator on the decorated object right after its

# declaration.

v.f1()

v.f2()

if __name__ == '__main__':

main()

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