def __init__(self, platform):
      super(Platform.UnknownPlatformError, self).__init__(platform % 'Unknown platform: %s')  # noqa

  # It blows my mind this code is not in distutils or distribute.
dataset/ETHPy150Open pantsbuild/pex/pex/platforms.py/Platform.UnknownPlatformError.__init__/swapped operands of `%`