python - 是否可以在运行时替换函数/方法装饰器？ [python]

如果我有一个函数：

@aDecorator
def myfunc1():
  # do something here

if __name__ = "__main__":
  # this will call the function and will use the decorator @aDecorator
  myfunc1()
  # now I want the @aDecorator to be replaced with the decorator @otherDecorator
  # so that when this code executes, the function no longer goes through
  # @aDecorator, but instead through @otherDecorator. How can I do this?
  myfunc1()

是否可以在运行时替换修饰符？

最佳答案

我不知道是否有一种方法可以在应用后“替换”一个修饰器，但我想可能没有，因为函数已经被更改了。
无论如何，您可以在运行时基于以下条件应用装饰器：

#!/usr/bin/env python

class PrintCallInfo:
    def __init__(self,f):
        self.f = f
    def __call__(self,*args,**kwargs):
        print "-->",self.f.__name__,args,kwargs
        r = self.f(*args,**kwargs)
        print "<--",self.f.__name__,"returned: ",r
        return r

# the condition to modify the function...
some_condition=True

def my_decorator(f):
    if (some_condition): # modify the function
        return PrintCallInfo(f)
    else: # leave it as it is
        return f

@my_decorator
def foo():
    print "foo"

@my_decorator
def bar(s):
    print "hello",s
    return s

@my_decorator
def foobar(x=1,y=2):
    print x,y
    return x + y

foo()
bar("world")
foobar(y=5)

关于python - 是否可以在运行时替换函数/方法装饰器？ [python]，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/642762/