The District Attorney shall continue to be elected, or, in the event of a vacancy, appointed as now provided by law, provided that the term of the District Attorney elected at the municipal election to be held in 1955 shall be for two years, and thereafter the District Attorney shall be elected for a term of four years, at the same municipal election as the Controller. The District Attorney shall take office on the first Monday in January in the year following his election.
53 P.S. § 13152