adbdd
ddddd
da
(1) ['shandong','hebei','beijing'];['shandong', 'hebei', 'beijing']
(1) ['j', 's', 'y', 'z']
(1) bhlst
(1) max
(2) min
(3) sum
(4) len
(5) name
(1) d = {"数学":101, "语文":202, "英语":203, "物理":204, "生物":206}
(2) d['化学']= 205
(3) d['数学']= 201
(4) del d['生物']; d.pop('生物');del(d['生物'])
(5) d[i],i ; d.get(i),i;
(1) del
(2) scores.pop
(3) del
https://www.acwing.com/file_system/file/content/whole/index/content/11870907/