Question

If I have a function :

 @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() 

Is it possible to replace a decorator at runtime?

Answer 1

I don’t know if there’s a way to ‘replace’ a decorator once it has been applied, but I guess that probably there’s not, because the function has already been changed.

You might, anyway, apply a decorator at runtime based on some condition:

#!/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)