链表list和字符串string

1 x = [1, 'a', 2, 'b']
2 type(x)

list

%添加元素
1 x.append(3.3)
2 print(x)

[1, 'a', 2, 'b', 3.3]

%遍历链表
1 for item in x:
2     print(item)

1
a
2
b
3.3

%使用索引进行链表遍历
1 i=0
2 while( i != len(x) ):
3     print(x[i])
4     i = i + 1

1
a
2
b
3.3

%使用+链接链表
1 [1,2] + [3,4]

[1, 2, 3, 4]

%使用*重复链表
1 [1]*3

[1, 1, 1]

%使用in判断链表中是否存在元素
1 1 in [1, 2, 3]

True

字符串

%使用[]来对字符串进行分段
1 x = 'This is a string'
2 print(x[0]) #first character
3 print(x[0:1]) #first character, but we have explicitly set the end character
4 print(x[0:2]) #first two characters

T
T
Th

%-1返回最后字符串最后一个元素
1 x[-1]

'g'

1 x[-4:-2]

'ri'

1 x[:3]

'Thi'

1 x[3:]

's is a string'

1 firstname = 'Christopher'
2 lastname = 'Brooks'
3 
4 print(firstname + ' ' + lastname)
5 print(firstname*3)
6 print('Chris' in firstname)

Christopher Brooks
ChristopherChristopherChristopher
True

%通过特殊字符拆分字符串
1 firstname = 'Christopher Arthur Hansen Brooks'.split(' ')[0] # [0] selects the first element of the list
2 lastname = 'Christopher Arthur Hansen Brooks'.split(' ')[-1] # [-1] selects the last element of the list
3 print(firstname)
4 print(lastname)

Christopher
Brooks

%字符串合并
1 'Chris' + '2'

'Chris2'

%字符串转换
1 'Chris' + str(2)

'Chris2'