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Python memoization decorator

I was looking for an example of a memoization decorator in Python2.

So far I found this one (in official? wiki): https://wiki.python.org/moin/PythonDecoratorLibrary#Memoize

My question is: does anybody see a bug in this code?

Line #13: if not isinstance(args, collections.Hashable) will always return True, since args will always be a hashable tuple.

Am I wrong?

Solution

  • Yes, that appears to be an error in the code.

    It appears to have been introduced in this edit.