Python返回列表中出現次數最多的值

def majorityCnt(classList):
    '''返回標籤列表中最多的標籤'''
    count_dict = {}
    for label in classList:
        if label not in count_dict.keys():
            count_dict[label] = 0
        count_dict[label] += 1
    # print(count_dict)
    return max(zip(count_dict.values(), count_dict.keys()))[1]