I have a list containing more lists, how do I create a cycle where for each list I take only element 0, then for each list I take only element 1 etc

Question

listName = [[\'mario\',\'jack\',\'bruce\'] , [\'mario\',\'jack\',\'bruce\'] , [\'mario\',\'jack\',\'bruce\']]

for L in range(len(listName )):

listX = listN