str

Posted 2020-12-30 xiaodebing

 1 print(‘字符串操作‘)
 2 
 3 s=‘abc DEF hij‘
 4 print(‘首字母大写‘)
 5 print(s.capitalize())
 6 
 7 print(‘全大写‘)
 8 print(s.upper())
 9 
10 print(‘全小写‘)
11 print(s.lower())
12 
13 print(‘大小写翻转‘)
14 print(s.swapcase())
15 
16 print(‘每个隔开的单词首字母大写‘)
17 print(s.title())
18 
19 print(‘居中‘)
20 print(s.center(20,‘#‘))
21 
22 print(‘默认将一个tab键变成8个空格，如果tab前面的字符长度不足8个，则补全8个，如果tab键前面的字符长度超过8个不足16个则补全16个，以此类推每次补全8个‘)
23 print(‘abc	def‘.expandtabs())
24 print(‘ab	def‘.expandtabs())
25 print(‘a	def‘.expandtabs())
26 print(‘abc	ef‘.expandtabs())
27 
28 print(‘长度‘)
29 print(len(‘abc一二三‘))
30 
31 print(‘以什么开头‘)
32 print(‘abc一二三‘.startswith(‘ab‘))
33 print(‘abc一二三‘.startswith(‘c一‘,2))
34 print(‘abc一二三‘.startswith(‘c一‘,2,5))
35 
36 print(‘abc‘.find(‘d‘))
37 print(‘以什么结尾‘)
38 print(‘abc一二三‘.endswith(‘二三‘))
39 
40 print(‘查找find找到返回位置索引，找不到返回-1；index找到返回索引位置，找不到报错‘)
41 print(‘abc‘.find(‘b‘))
42 print(‘abc‘.find(‘d‘))
43 print(‘abc‘.index(‘b‘))
44 #print(‘abc‘.index(‘d‘))
45 
46 print(‘去空格‘)
47 print(‘   abc  def   ‘.strip())
48 print(‘$*abc def*&*‘.strip(‘$*‘))
49 print(‘$$*abc def*&*$$‘.lstrip(‘$*‘))
50 print(‘$$*abc def*&*$$‘.rstrip(‘$*‘))
51 
52 print(‘统计个数‘)
53 print(‘ abc aaa‘.count(‘a‘))
54 print(‘ abc aaa‘.count(‘aa‘))
55 print(‘ abc aaa‘.count(‘aaaa‘))
56 
57 print(‘分隔‘)
58 print(‘abc def‘.split())
59 print(‘abc %def‘.split(‘%‘))
60 
61 print(‘格式化输出‘)
62 print(‘我叫{},年龄{},性别{}‘.format(‘小明‘,18,‘男‘))
63 print(‘我叫{0},年龄{1},性别{2},姓名{0}‘.format(‘小明‘,18,‘男‘))
64 print(‘我叫{name},年龄{age},性别{sex}‘.format(name=‘小明‘,age=18,sex=‘男‘))
65 
66 print(‘替换‘)
67 print(‘abcabc‘.replace(‘bc‘,‘d‘))
68 print(‘abcabc‘.replace(‘bc‘,‘d‘,1))
69 
70 print(‘字符串abc123由字母或数字组成{}‘.format(‘abc123‘.isalnum()))
71 print(‘字符串abc由字母或数字组成{}‘.format(‘abc‘.isalnum()))
72 print(‘字符串123由字母或数字组成{}‘.format(‘123‘.isalnum()))
73 
74 print(‘字符串abc123只由字母组成{}‘.format(‘abc123‘.isalpha()))
75 print(‘字符串abc由字母组成{}‘.format(‘abc‘.isalpha()))
76 print(‘字符串123由字母组成{}‘.format(‘123‘.isalpha()))
77 
78 print(‘字符串abc123只由数字组成{}‘.format(‘abc123‘.isdigit()))
79 print(‘字符串abc由数字组成{}‘.format(‘abc‘.isdigit()))
80 print(‘字符串123由数字组成{}‘.format(‘123‘.isdigit()))