def __init__(self, name, default, help, enum_values=None,
               short_name=None, **args):
    enum_values = enum_values or []
    p = EnumParser(enum_values)
    g = ArgumentSerializer()
    Flag.__init__(self, p, g, name, default, help, short_name, **args)
    if not self.help: self.help = "an enum string"
    self.help = ("|".join(enum_values), self.help) % "<%s>: %s"
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/python-gflags/gflags.py/EnumFlag.__init__/swapped operands of `%`