(a) Primary election. Councilmen shall be nominated, two from each district, by the electors respectively voting separately in the city districts as established by the charter and shall be residents of the district for which they are nominated. Two candidates for mayor, four candidates for municipal judges and four constables shall be nominated by the electors of the city at large.
(b) Regular election. The mayor shall be elected at large and one councilman from each district shall at the regular city election be elected at large and each shall hold office for four years, the terms of office shall commence on the Monday next following the date of the election, or at such earlier date as the board of canvassers shall have met and certified the results of the election and the new officers shall have taken their oath of office.