如果我的数据框看起来像这样，我想删除行，如果有＆＃34; A＆＃34;在A栏
df
A B C
1 "4:10:05A" James Math
2 "3:10:45" Tony Science
3 "3:10:55" Hong Math
4 "1:34:23A" Kim Math
5 "2:34:13A: Min English
结果看起来像这样
df
A B C
2 "3:10:45" Tony Science
3 "3:10:55" Hong Math