Convenience constructor to make a ConversionElectrode from a
        composition and all entries in a chemical system.

        Args:
            comp: Starting composition for ConversionElectrode, e.g.,
                Composition("FeF3")
            entries_in_chemsys: Sequence containing all entries in a
               chemical system. E.g., all Li-Fe-F containing entries.
            working_ion_symbol: Element symbol of working ion. Defaults to Li.

def from_composition_and_entries(comp, entries_in_chemsys,
                                     working_ion_symbol="Li"):
        """
        Convenience constructor to make a ConversionElectrode from a
        composition and all entries in a chemical system.

        Args:
            comp: Starting composition for ConversionElectrode, e.g.,
                Composition("FeF3")
            entries_in_chemsys: Sequence containing all entries in a
               chemical system. E.g., all Li-Fe-F containing entries.
            working_ion_symbol: Element symbol of working ion. Defaults to Li.
        """
        pd = PhaseDiagram(entries_in_chemsys)
        return ConversionElectrode.from_composition_and_pd(comp, pd,
                                                           working_ion_symbol)