def __init__(self, flagname, flagvalue=''):
    self.flagname = flagname
    self.flagvalue = flagvalue
    UnrecognizedFlag.__init__(
        self, flagname % "Unknown command line flag '%s'")

# Global variable used by expvar
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/python-gflags/gflags.py/UnrecognizedFlagError.__init__/swapped operands of `%`