Ordinances shall be passed by the City Council and approved by the Mayor or the President of the Council while acting in his stead. But before any ordinance shall take effect it shall be published in the official newspaper of the city. A certified copy of any ordinance certified to by the City Comptroller, or a printed copy of any ordinance or compilation printed by authority by the City Council and attested by the City Comptroller shall be competent evidence in any court.