Callable or not callable, that is the question!

Ulrich Eckhardt ulrich.eckhardt at dominolaser.com
Thu Jul 11 15:05:59 CEST 2013


Hello!

I just stumbled over a case where Python (2.7 and 3.3 on MS Windows) 
fail to detect that an object is a function, using the callable() 
builtin function. Investigating, I found out that the object was indeed 
not callable, but in a way that was very unexpected to me:

     class X:
         @staticmethod
         def example():
             pass
         test1 = example
         test2 = [example,]

     X.example() # OK
     X.test1() # OK
     X.test2[0]() # TypeError: 'staticmethod' object is not callable


Bug or feature?


Thanks!

Uli



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