列表-Ⅳ

BrightXiong

>>> s = [1, 2, 3]
>>> t = [4, 5, 6]
>>> s + t
[1, 2, 3, 4, 5, 6]
>>> s * 3
[1, 2, 3, 1, 2, 3, 1, 2, 3]
>>> maxtrix = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
>>> maxtrix = [[1,2,3],]
>>> maxtrix
[[1, 2, 3]]
>>> maxtirx = []
>>> maxtrix = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]
>>> for i in maxtrix:
...         for each in i :
...                 print(each)
...
1
2
3
4
5
6
7
8
9
>>> maxtrix[0]
[1, 2, 3]
>>> maxtrix[0][0]
1
>>> maxtrix[0][2]
3
>>> A = [0] * 3
>>> A
[0, 0, 0]
>>> for i in range(3):
...         A[i] = [0] * 3
...
>>> A
[[0, 0, 0], [0, 0, 0], [0, 0, 0]]
>>> x = "FishC"
>>> y = "FishC"
>>> x is y
True
>>> # is检验两个变量是否指向同一个对象
>>> x = [1, 2, 3]
>>> y = [1, 2, 3]
>>> x is y
False