Fixes#28198
Changed how string format method is used to support Python 2.6 syntax. By adding in positional arguments to braces in format method (e.g. {0}, {1}), Python 2.6 can support this module, without causing issues in newer versions of Python.
See ref for info on format differences w/ 2.6:
https://docs.python.org/2/library/string.html#format-string-syntax