Let's go over a few pieces of advice concerning decorators that did not fit into earlier sections.
Decorators with arguments are an advanced topic. They can be implemented as types with a __call__ method, or as a triple-nested function. For example, the following two pieces of code behave the same.
def deco_using_func(key):
def _deco(func):
def inner(*args, **kwargs):
print 'Hello from', key
return func(*args, **kwargs)
return inner
return _deco
class deco_using_cls(object):
def __init__(self, key):
self.key = key
def __call__(self, func):
def inner(*args, **kwargs):
print 'Hello from', self.key
return func(*args, **kwargs)
return innerEither one would be hooked up as follows. Note that the decorator is called with arguments.
>>> @deco_using_func('func deco')
... def decorated_func1():
... return
>>> decorated_func1...