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July 22, 2015 09:25
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decorators examples
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| def add(x, y): | |
| return x + y | |
| def dummy_decorator(func): | |
| """This decorator does NOT modify ``func`` behavior. | |
| It only prints stuff. | |
| """ | |
| print 'creating wrapper' | |
| def wrapper(*args, **kwargs): | |
| print 'before' | |
| result = func(*args, **kwargs) | |
| print 'after' | |
| return result | |
| print 'wrapper created' | |
| return wrapper | |
| def inc_decorator(func): | |
| """This decorator increments ``func``'s result by one. | |
| """ | |
| def wrapper(*args, **kwargs): | |
| return func(*args, **kwargs) + 1 | |
| return wrapper | |
| class IncDecorator(object): | |
| def __init__(self, func, increment=1): | |
| self.func = func | |
| self.increment = increment | |
| def __call__(self, *args, **kwargs): | |
| return self.func(*args, **kwargs) + self.increment | |
| add_dummy = dummy_decorator(add) | |
| add_plus_one_func = inc_decorator(add) | |
| add_plus_one_class = IncDecorator(add) | |
| assert add(1, 1) == 2 | |
| assert add_dummy(1, 1) == 2 | |
| assert add_plus_one_func(40, 1) == 42 | |
| assert add_plus_one_class(40, 1) == 42 | |
| # Of course, all these decorators can be used via the decorator notation: | |
| # | |
| # @inc_decorator | |
| # def add(x, y): | |
| # return x + y |
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