Commit aedcee1
| Original file line number | Diff line number | Diff line change | |
|---|---|---|---|
@@ -1,55 +1,25 @@ | |||
| 1 | - #!/usr/bin/env python | ||
| 2 | - # -*- coding: utf-8 -*- | ||
| 1 | + '''https://docs.python.org/2/library/functools.html#functools.wraps''' | ||
| 2 | + '''https://stackoverflow.com/questions/739654/how-can-i-make-a-chain-of-function-decorators-in-python/739665#739665''' | ||
| 3 | 3 | ||
| 4 | - """http://stackoverflow.com/questions/3118929/implementing-the-decorator-pattern-in-python""" | ||
| 4 | + from functools import wraps | ||
| 5 | 5 | ||
| 6 | + def makebold(fn): | ||
| 7 | + @wraps(fn) | ||
| 8 | + def wrapped(): | ||
| 9 | + return "<b>" + fn() + "</b>" | ||
| 10 | + return wrapped | ||
| 6 | 11 | ||
| 7 | - class foo_decorator(object): | ||
| 12 | + def makeitalic(fn): | ||
| 13 | + @wraps(fn) | ||
| 14 | + def wrapped(): | ||
| 15 | + return "<i>" + fn() + "</i>" | ||
| 16 | + return wrapped | ||
| 8 | 17 | ||
| 9 | - def __init__(self, decoratee): | ||
| 10 | - self._decoratee = decoratee | ||
| 11 | - | ||
| 12 | - def f1(self): | ||
| 13 | - print("decorated f1") | ||
| 14 | - self._decoratee.f1() | ||
| 15 | - | ||
| 16 | - def __getattr__(self, name): | ||
| 17 | - return getattr(self._decoratee, name) | ||
| 18 | - | ||
| 19 | - | ||
| 20 | - class undecorated_foo(object): | ||
| 21 | - | ||
| 22 | - def f1(self): | ||
| 23 | - print("original f1") | ||
| 24 | - | ||
| 25 | - def f2(self): | ||
| 26 | - print("original f2") | ||
| 27 | - | ||
| 28 | - | ||
| 29 | - @foo_decorator | ||
| 30 | - class decorated_foo(object): | ||
| 31 | - | ||
| 32 | - def f1(self): | ||
| 33 | - print("original f1") | ||
| 34 | - | ||
| 35 | - def f2(self): | ||
| 36 | - print("original f2") | ||
| 37 | - | ||
| 38 | - | ||
| 39 | - def main(): | ||
| 40 | - u = undecorated_foo() | ||
| 41 | - v = foo_decorator(u) | ||
| 42 | - # The @foo_decorator syntax is just shorthand for calling | ||
| 43 | - # foo_decorator on the decorated object right after its | ||
| 44 | - # declaration. | ||
| 45 | - | ||
| 46 | - v.f1() | ||
| 47 | - v.f2() | ||
| 18 | + @makebold | ||
| 19 | + @makeitalic | ||
| 20 | + def hello(): | ||
| 21 | + '''a decorated hello world''' | ||
| 22 | + return "hello world" | ||
| 48 | 23 | ||
| 49 | 24 | if __name__ == '__main__': | |
| 50 | - main() | ||
| 51 | - | ||
| 52 | - ### OUTPUT ### | ||
| 53 | - # decorated f1 | ||
| 54 | - # original f1 | ||
| 55 | - # original f2 | ||
| 25 | + print('result:{} name:{} doc:{}'.format(hello(), hello.__name__, hello.__doc__)) | ||
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