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Care should be taken in using a condition like so: if six.PY3: foo() else: bar() This assumes PY2 and PY4 would behave the same. Rather the conditional should check for PY2 and use the else for PY3 and future versions of Python. http://astrofrog.github.io/blog/2016/01/12/stop-writing-python-4-incompatible-code/ Change-Id: I9bc00e2f01fe8fe970d6c5327207c08a90885cda