Python-str-操作-6

时间：2023-03-08 16:16:10
#字符串的索引与切片

s = 'ABCDLSESRF'

#索引

s1 = s[0]

print(s1)

s2 = s[2]

print(s2)

s3 = s[-1]

print(s3)

s4 = s[-2]

print(s4)

# #ABCD   切片 ：顾头不顾尾

s5 = s[0:4]

print(s5)

s6 = s[0:-1]

print(s6)

s7 = s[:]

s8 = s[0:]

print(s7,s8)

s9 = s[0:0]

s = 'ABCDLSESRF'  # s[首:尾:步长]

s10 = s[0:5:2]

print(s10)

s11 = s[4:0:-1]

print(s11)

s12 = s[3::-1]

print(s12)

s13 = s[3::-2]

print(s13)

s = 'ABCDLSESRF'

s14 = s[-1::-1]

print(s14)

s15 = s[::-1]

print(s15)

#字符串的操作

s = 'alexWUsir'

s1 = s.capitalize()  # 首字母大写

# print(s1)

# 全大写，全小写

s2 = s.upper()

s21 = s.lower()

print(s2,s21)

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')

#大小写翻转

s3 = s.swapcase()

print(s3)

# 每个隔开(特殊字符或者数字)的单词首字母大写

s = 'alex*egon-wusir'

s4 = s.title()

print(s4)

s = 'fade,crazy*w4rri0r_songsong node_3'

s4 = s.title()

print(s4)

#居中，空白填充

s = 'alexWUsir'

s5 = s.center(20,'~')

print(s5)

s = 'alex\tsir'

s6 = s.expandtabs()

print(s6)

s = 'alex二哥'

#公共方法

l = len(s)

print(l)

#以什么开头结尾 endswith

s = 'alexWUsir'

s7 =s.startswith('alex')

s71 = s.startswith('e',2,5)

print(s71)

if s7:

    pass

elif s.startswith('bl'):

    pass

print(s7)

# 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(s81,type(s8))

#strip rstrip lstrip

s = 'alexWUsir%'

s9 = s.strip('%')

print(s9)

s = ' *a%lexWUsi* r%'

s91 = s.strip(' %*')

print(s91)

# strip 默认删除前后空格

username = input('请输入名字：').strip()

if username =='春哥':

    print('恭喜春哥发财')

s = 'alexaa wusirl'

s10 = s.count('al')

print(s10)

#split   str ---->list

s = ';alex;wusir;taibai'

l = s.split('a')

print(l)

#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)

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)   #后面不加参数1就默认全部替换

print(s11)

s = 'fhdsklfds'

for i in s:

    print(i)

s = 'fdsa苍井空fdsalk'

if '苍井空' in s:

    print('您的评论有敏感词...')

A

C

F

R

ABCD

ABCDLSESR

ABCDLSESRF ABCDLSESRF

ACL

LDCB

DCBA

DB

FRSESLDCBA

FRSESLDCBA

ALEXWUSIR alexwusir

请输入验证码，不区分大小写

别人能做的事，你能做的更好。

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