Comment #4 on issue 2605 by asmeurer: ntheory/factor_.py: doctest incompatible with 2to3
http://code.google.com/p/sympy/issues/detail?id=2605
I've reported this issue upstream (see upstream issue 12611 [1]) but whatever is done there we'll still have to support other Python versions so we should find a way to rewrite the doctest (or remove it).
In this case, just work around it with the for loop, but if it were something more serious, we could conceivably only support a certain version of 2to3.
It's OK to have version requirements on dev tools. For example, we are going to have to support only a pretty recent version of Sphinx whenever we start using the new Live extension. The end user should never have to run 2to3, as we will provide separate source tarballs for Python 2 and Python 3.
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