2021-01-28列表练习题

1.把a和b的值一起组合打印出来
a=[1,2,3,"this is a list"]
b=[4,5,6,"这是2个列表"]

 a=[1,2,3,"this  is  a  list"]
 b=[4,5,6,"这是2个列表"]
print(a+b)

2.输出列表a两次

 a=[1,2,3,"this  is  a  list"]
print(a*2)

3. 取列表中的第一个值

 a=[1,2,3,"this  is  a  list"]
print(a[0])

4.取列表中第二个和第三个值

 a=[1,2,3,"this  is  a  list"]
print(a[1:3])#切片：1.取上不取下 2.索引从0开始 3.右边数从-1开始

5.取第三个值以及到末尾的所有值

 a=[1,2,3,"this  is  a  list"]
print(a[2:])

6：L=[
['apple','goole','microsoft'],
['java','python','ruby','php'],
['adam','bart','lisa']
]
打印apple,python,lisa

L=[
             ['apple','goole','microsoft'],
             ['java','python','ruby','php'],
             ['adam','bart','lisa']
          ]
print(L[0][0])
print(L[1][1])
print(L[2][2])