1483. 最高平均分

class Solution:
    """
    @param names: the name
    @param grades: the grade
    @return: the maximum average score
    """
    ‘‘‘
    大致思路:
    1.初始化字典，dic = {},例{‘alex‘:[]...},然后如果是同名的话，则将值append到value里面，最终循环dic，取出最大平均值即可。
    ‘‘‘
    def maximumAverageScore(self, names, grades):
        dic = {}
        for i in range(len(names)):
            if names[i] not in dic:
                dic[names[i]] = [grades[i]]
            else:
                dic[names[i]].append(grades[i])
        
        max_num = 0
        for k,v in dic.items():
            if sum(v)/len(v) > max_num:
                max_num = sum(v)/len(v)
        return max_num