node2vec
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python3 compatibility and PEP8 conformity
Hi! We just started using node2vec in one of our projects, and needed python 3 compatibility, which is what this PR brings. It's mixed with style changes to conform to PEP8 (which I could remove if you prefer). The Py3 changes are very minor (admittedly lost in the bigger PEP8 conformity changes), but might be useful. Thanks for the great software.