更一般一些：
def composed(*decs): def deco(f): for dec in reversed(decs): f = dec(f) return f return deco
然后
@composed(dec1, dec2)def some(f): pass
相当于
@dec1@dec2def some(f): pass
更一般一些：
def composed(*decs): def deco(f): for dec in reversed(decs): f = dec(f) return f return deco
然后
@composed(dec1, dec2)def some(f): pass
相当于
@dec1@dec2def some(f): pass
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