[英]How can I apply decorator to a superclass method in a subclass?
說,我們有以下情況,
class A():
def something():
...
...
...
class B(A):
def use_something():
...
...
# Now, at this point I want something() to be decorated with a
# decorator. But, since it is already defined in base class,
# I am not getting how to decorate it here, in the subclass.
self.something()
...
...
現在,在B類中,我想使用A類中的something(),但我想為其應用裝飾器。 我無法在A類中進行裝飾,因為我想在不同的地方應用不同的裝飾器。 比方說,C(A)類,我也想在此處使用其他裝飾器使用something()。
因此,回到原來的問題; 如何在子類中將裝飾器應用於超類的方法?
您可以在這里(使用params和不使用params):
def simple_dec(func):
def wrapped(*args, **kwargs):
return 'No way'
return wrapped
def simple_dec_params(first_param, second_param):
def dec(func):
def wrapped(*args, **kwargs):
return '{} {}'.format(first_param, second_param)
return wrapped
return dec
class A():
def something(self):
print 'Something'
class B(A):
def use_something(self):
first_param = 'No'
second_param = 'Way'
print simple_dec(self.something)()
print simple_dec_params(first_param, second_param)(self.something)()
b = B()
b.use_something()
有什么特殊原因導致您不能僅僅覆蓋something()
嗎?
class A():
def something(self):
...
class B(A):
def use_something(self):
...
self.something()
...
def something(self):
# Do "decorator" stuff
super().something()
# Do more "decorator" stuff
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