Python 3 (Poser 12) understands the old way of formatting strings with "%", and Python 2 (P11) can handle ".format(...)" strings preferred with Python 3.

• Python 2 string formatting: https://docs.python.org/2/library/stdtypes.html#string-formatting
• Python 3 string formatting: https://docs.python.org/3/library/string.html#string-formatting

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