python 二位dict 

mp = {}
for i in range(n) :
    for j in range(m) :
        if i not in mp:
            mp[i] = {}
        mp[i][j] = ?

 

posted @ 2019-03-25 13:24  啦啦啦天啦噜  阅读(217)  评论(0)    收藏  举报