我正在尝试创建一个装饰器类来计算函数被调用的次数,但是我得到了一条错误消息,说:
"TypeError: __exit__() takes exactly 1 argument (4 given)"
我真的不知道怎么给它四个论点。我的代码如下所示:
class fcount2(object):
__instances = {}
def __init__(self, f):
self.__f = f
self.__numcalls = 0
fcount2.__instances[f] = self
def __call__(self, *args, **kwargs):
self.__numcalls += 1
return self.__f(*args, **kwargs)
def __enter__(self):
return self
def __exit__(self):
return self
@staticmethod
def count(f):
return fcount2.__instances[self.__f].__numcalls
@fcount2
def f(n):
return n+2
for n in range(5):
print f(n)
print 'f count =',f.count
def foo(n):
return n*n
with fcount2(foo) as g:
print g(1)
print g(2)
print 'g count =',g.count
print 'f count =',f.count
with fcount2(f) as g:
print g(1)
print g(2)
print 'g count =',g.count
print 'f count =',f.count
with f:
print f(1)
print g(2)
print 'g count =',g.count
print 'f count =',f.count
有没有其他一些我应该(或者不应该)传递给def 出口函数的参数?任何建议或想法都将不胜感激。
顺便说一句,我的代码行"print 'f count =',f.count“似乎输出的是内存地址而不是值,但这是一个完全不同的问题。
https://stackoverflow.com/questions/22417323
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