def flag_names(self):
        # Regular flag names
        flags = sorted(self.flags.values(), key=flag_key)
        names = [self.names_for(to_flag(x.name)) for x in flags]
        # Inverse flag names sold separately
        names.append(self.inverse_flags.keys())
        return tuple(itertools.chain.from_iterable(names))
Similar to `help_tuples` but returns flag names only, no helpstrs.
dataset/ETHPy150Open pyinvoke/invoke/invoke/parser/context.py/ParserContext.flag_names