Raised if there is a flag naming conflict.

Inherits From: Error



Creates a DuplicateFlagError by providing flag name and values.

flagname str, the name of the flag being redefined.
flag_values FlagValues, the FlagValues instance containing the first definition of flagname.
other_flag_values FlagValues, if it is not None, it should be the FlagValues object where the second definition of flagname occurs. If it is None, we assume that we're being called when attempting to create the flag a second time, and we use the module calling this one as the source of the second definition.

An instance of DuplicateFlagError.