1).字符串的索引以及切片
s = 'ABCDLSESRF' #索引 s1 = s[0] print(s1) #A s2 = s[2] print(s2) #C s3 = s[-1] print(s3) #F s4 = s[-2] print(s4) #R #ABCD 切片 :顾头不顾尾 s5 = s[0:4] print(s5) #ABCD s6 = s[0:-1] print(s6) #ABCDLSESRF #s7 = s[:] s6一样的 #s8 = s[0:] 功能 print(s7,s8) s9 = s[0:0] #无表示且不报错 s = 'ABCDLSESRF' # s[首:尾:步长] s10 = s[0:5:2] print(s10) #ACL s11 = s[4:0:-1] print(s11) #LDCB s12 = s[3::-1] print(s12) #DCBA s13 = s[3::-2] print(s13) #DB s = 'ABCDLSESRF' s14 = s[-1::-1] print(s14) #FRSESLDCBA s15 = s[::-1] print(s15) #FRSESLDCBA
2).字符串的操作
1.首字母大写.capitalize()
s = 'alexWUsir' s1 = s.capitalize() print(s1)
2.全大写.upper()、全小写.lower()
s = 'alexWUsir' s1 = s.upper() s2 = s.lower print(s1) print(s2)
s_str= 'acEQ1' you_input =input('请输入验证码,不区分大小写') if s_str.upper() == you_input.upper(): print('输入成功') else: print('请重新输入')
3.大小写翻转.swapcase()
s3 = s.swapcase() print(s3)
4.每个隔开(特殊字符或者数字)的单词首字母大写.tittle()
s = 'alex*egon-wusir' s4 = s.title() print(s4) s = 'fade,crazy*w4rri0r_songsong node_3' s4 = s.title() print(s4)
5.居中,空白填充.center()
s = 'alexWUsir' s5 = s.center(20,'~') print(s5)
6.去除/t替换为空格.expandtabs()
s = 'alex\tsir' s6 = s.expandtabs() print(s6)
7.字符串的长度.len()
s = 'alex\tsir' l = len(s) print(l)
8.以什么开头.starwish,以什么结尾.endwish
s = 'alexWUsir' s7 =s.startswith('alex') s71 = s.startswith('e',2,5) print(s71,s7)
9.通过元素找索引.find() .index
find 通过元素找索引,找不到返回-1
index 通过元素找索引,找不到报错
s = 'alexWUsir' s8 = s.find('A') s81 = s.index('A') print(s81s8)
10.默认删除前后空格.strip() .lstrip从左删 .rstrip从右删
s = 'alexWUsir%' s9 = s.strip('%') print(s9) s = ' *a%lexWUsi* r%' s91 = s.strip(' %*') print(s91)
11.找出字符中某元素的个数.count()
s = 'alexaa wusirl' s10 = s.count('al') print(s10)
12.字符串切割成列表 .split()
s = ';alex;wusir;taibai' l = s.split('a') print(l)
13.格式化输出.format()
#format的三种玩法 格式化输出 s = '我叫{},今年{},爱好{},再说一下我叫{}'.format('太白',36,'girl','太白') print(s) name = input('请输入名字:') s = '我叫{0},今年{1},爱好{2},再说一下我叫{0}'.format(name,36,'girl') print(s) name = input('请输入名字:') s = '我叫{name},今年{age},爱好{hobby},再说一下我叫{name}'.format(age=18,name=name,hobby='girl') print(s)
14.字符串中元素的替换.replace()
s = '来看待街坊邻居复合大师街坊法好的撒见客户' s11 = s.replace('街坊','老王',1) print(s11)