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是否与要求行使职能完全一样,在座标上是个cor?
原标题:is a decorator in python exactly the same as calling a function on a function?

我认为,

@f
def g():
   print  hello 

确实如此。

def g():
   print  hello 
g=f(g)

但是,我有这一法典,它使用的是背景平衡。

@contextlib.contextmanager
def f():
    print 1
    yield
    print 2
with f:
    print 3

页: 1

而且,当我试图把它变为现实的时候。

def f():
    print 1
    yield
    print 2
f=contextlib.contextmanager(f)
with f:
    print 3

页: 1 AttributeError:Function Object has no Depende __exit__

我失踪了什么? 具体来说,有一些黑神.。 情况分析,或者是否误解了矫正员如何总体工作?

最佳回答

是的,评分与称职和分配回扣价值完全相同。

在这种情况下,出现错误是因为你不要求履行职务,所以正确的守则是正确的。

def f():
    print 1
    yield
    print 2

f=contextlib.contextmanager(f)
with f():
    print 3

我也不清楚你是否测试了代码,因为你颁发的校正编码由于同样原因将失败。

@contextlib.contextmanager
def f():
    print 1
    yield
    print 2
with f:
    print 3

错误:

    with f:
Attribute错误:  function  object has no attribute  __exit__ 
问题回答

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