本文介绍了Python3有条件地装饰?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
是否可以根据条件装饰函数?
Is it possible to decorate a function based on a condition?
阿拉:
if she.weight() == duck.weight():
@burn
def witch():
pass
我只是想知道是否可以使用逻辑(当调用 witch
时?)来确定是否用 @burn<装饰
witch
/代码>?
I'm just wondering if logic could be used (when witch
is called?) to figure out whether or not to decorate witch
with @burn
?
如果不是,是否可以在装饰器中创建一个条件以达到相同的效果?(witch
被称为未装饰.)
If not, is it possible to create a condition within the decorator to the same effect? (witch
being called undecorated.)
推荐答案
你可以创建一个'有条件'的装饰器:
You can create a 'conditionally' decorator:
>>> def conditionally(dec, cond):
def resdec(f):
if not cond:
return f
return dec(f)
return resdec
用法示例如下:
>>> def burn(f):
def blah(*args, **kwargs):
print 'hah'
return f(*args, **kwargs)
return blah
>>> @conditionally(burn, True)
def witch(): pass
>>> witch()
hah
>>> @conditionally(burn, False)
def witch(): pass
>>> witch()
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