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Python 3 persistent_hash was broken. Go back to builtin hash instead. #616

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I was trying the examples/util/estimate_pi.py example on a Python 3 Disco installation and it was failing in a call to persistent_hash because it was trying to run str_to_bytes on an integer and failing because it has no 'encode' method.

I see from the discussion groups that at least one other person has had a problem with this persistent_hash.

Having looked at it I can't see any reason why the Python 3 code can't use the builtin 'hash' function just like the Python 2 code does.

It's hard so second guess the reason as to why the persistent_hash function was added. At least as far as the estimate_pi example goes I get an answer instead of an exception (as long as I fix the print statement at the bottom of the file).

Giles

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