python 類裝飾器

1 裝飾器無參數

class tracer:?

??? def __init__(self,func):?

??????? self.calls = 0?

??????? self.func = func?

??? def __call__(self,*args):?

??????? self.calls += 1?

??????? print('call %s to %s' %(self.calls, self.func.__name__))?

??????? self.func(*args)?

?

@tracer

def spam(a, b, c):?

??? print(a + b + c)?

?

?

spam(1,2,3)

?

2 裝飾器帶參數

class tracer: ?

? ? def __init__(self, *args): ?

? ? ? ? self.calls = 0

? ? ? ? self.args = args

? ? ?

? ? def __call__(self, func):

? ? ? ? self.func = func

? ? ? ? def realfunc(*args):

? ? ? ? ? ? ? self.calls += 1

? ? ? ? ? ? ? print('call %s to %s' %(self.calls, self.func.__name__))

? ? ? ? ? ? ? self.func(*args)

? ? ? ? return realfunc

?

@tracer("xxxx")

def spam(a, b, c): ?

? ? print(a + b + c) ?

?

spam(1,2,3)

?

spam(1,2,3)

class tracer: ?? ? def __init__(self,func): ?? ? ? ? self.calls = 0 ?? ? ? ? self.func = func ?? ? def __call__(self,*args): ?? ? ? ? self.calls += 1 ?? ? ? ? print('call %s to %s' %(self.calls, self.func.__name__)) ?? ? ? ? self.func(*args) ??@tracerdef spam(a, b, c): ?? ? print(a + b + c) ?
spam(1,2,3)spam(1,2,3)

?

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