创建例子如下:
2d_list = [[0 for col in range(cols)] for row in range(rows)]
其中cols, rows变量替换为你需要的数值即可,例如:
2d_list = [[0 for col in range(9)] for row in range(9)]# 9*9的二维列表
str='today I will go home'list=[]
for i in str:
if str.count(i)==1:
list.append(i)
print(list)
运行结果: