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字符串及用法

2024-11-01 10:47:03   205人阅读

1.%s,%d

举例1：name=‘egon‘

　　　  age=20

　　　  print("my name is %s  my age is %s" %(name,age))#%s既能接受字符串，也能接受数字

　　　  print(‘my name is %s  my age is %d’ %(name,age))#%d只能接受数字

2.字符串方法

# name=‘egon‘ #name=str(‘egon‘)

# print(type(name))
 
 
#优先掌握
#1.移除空白strip
# msg=‘             hello         ‘
# print(msg)
# print(msg.strip())
# 移除‘*’
# msg=‘***hello*********‘
# msg=msg.strip(‘*‘)
# print(msg)
#移除左边的
# print(msg.lstrip(‘*‘))
#移除右边的
# print(msg.rstrip(‘*‘))
 
#用处
while True:
    name=input(‘user: ‘).strip()
    password=input(‘password: ‘).strip()
    if name == ‘egon‘ and password == ‘123‘:
        print(‘login successfull‘)
 
 
 
#切分split
# info=‘root:x:0:0::/root:/bin/bash‘
# print(info[0]+info[1]+info[2]+info[3])
 
# user_l=info.split(‘:‘)
# print(user_l[0])
 
# msg=‘hello world egon say hahah‘
# print(msg.split()) #默认以空格作为分隔符
 
#cmd=‘download|xhp.mov|3000‘
# cmd_l=cmd.split(‘|‘)
# print(cmd_l[1])
# print(cmd_l[0])
# print(cmd.split(‘|‘,1))
 
#用处
while True:
    cmd=input(‘>>:　‘).strip()
    if len(cmd) == 0:continue
    cmd_l=cmd.split()
    print(‘命令是:%s 命令的参数是:%s‘ %(cmd_l[0],cmd_l[1]))
 
 
 
 
 
#长度len
# print(len(‘hell 123‘))
 
 
#索引
# 切片:切出子字符串
# msg=‘hello world‘
# print(msg[1:3]) #1 2
# print(msg[1:4]) #1 2 3
 
 
 
# 掌握部分
oldboy_age=84
while True:
    age=input(‘>>: ‘).strip()
    if len(age) == 0:
        continue
    if age.isdigit():
        age=int(age)
    else:
        print(‘must be int‘)
 
 
 
 
 
#startswith,endswith
# name=‘alex_SB‘
# print(name.endswith(‘SB‘))
# print(name.startswith(‘alex‘))
 
 
#replace
# name=‘alex say :i have one tesla,my name is alex‘
# print(name.replace(‘alex‘,‘SB‘,1))
 
# print(‘my name is %s my age is %s my sex is %s‘ %(‘egon‘,18,‘male‘))
# print(‘my name is {} my age is {} my sex is {}‘.format(‘egon‘,18,‘male‘))
# print(‘my name is {0} my age is {1} my sex is {0}:
{2}‘.format(‘egon‘,18,‘male‘))
# print(‘my name is {name} my age is {age} my sex is {sex}‘.format(
#     sex=‘male‘,
#     age=18,
#     name=‘egon‘))
 
 
# name=‘goee say hello‘
# # print(name.find(‘S‘,1,3)) #顾头不顾尾,找不到则返回-1不会报错,找到了则显示索引
# # print(name.index(‘S‘)) #同上,但是找不到会报错
#
# print(name.count(‘S‘,1,5)) #顾头不顾尾,如果不指定范围则查找所有
 
 
#join
# info=‘root:x:0:0::/root:/bin/bash‘
# print(info.split(‘:‘))
 
# l=[‘root‘, ‘x‘, ‘0‘, ‘0‘, ‘‘, ‘/root‘, ‘/bin/bash‘]
# print(‘:‘.join(l))
 
 
#lower,upper
# name=‘eGon‘
# print(name.lower())
# print(name.upper())
 
 
#了解部分
#expandtabs
# name=‘egon\thello‘
# print(name)
# print(name.expandtabs(1))
 
 
#center,ljust,rjust,zfill
# name=‘egon‘
# # print(name.center(30,‘-‘))
# print(name.ljust(30,‘*‘))
# print(name.rjust(30,‘*‘))
# print(name.zfill(50)) #用0填充
 
 
#captalize,swapcase,title
# name=‘eGon‘
# print(name.capitalize()) #首字母大写,其余部分小写
# print(name.swapcase()) #大小写翻转
# msg=‘egon say hi‘
# print(msg.title()) #每个单词的首字母大写
 
 
#在python3中
num0=‘4‘
num1=b‘4‘ #bytes
num2=u‘4‘ #unicode,python3中无需加u就是unicode
num3=‘四‘ #中文数字
num4=‘Ⅳ‘ #罗马数字
 
 
#isdigt:str,bytes,unicode
# print(num0.isdigit())
# print(num1.isdigit())
# print(num2.isdigit())
# print(num3.isdigit())
# print(num4.isdigit())
 
#isdecimal:str,unicode
# num0=‘4‘
# num1=b‘4‘ #bytes
# num2=u‘4‘ #unicode,python3中无需加u就是unicode
# num3=‘四‘ #中文数字
# num4=‘Ⅳ‘ #罗马数字
# print(num0.isdecimal())
# # print(num1.)
# print(num2.isdecimal())
# print(num3.isdecimal())
# print(num4.isdecimal())
 
#isnumeric:str,unicode,中文，罗马
# num0=‘4‘
# num1=b‘4‘ #bytes
# num2=u‘4‘ #unicode,python3中无需加u就是unicode
# num3=‘四‘ #中文数字
# num4=‘Ⅳ‘ #罗马数字
#
# print(num0.isnumeric())
# # print(num1)
# print(num2.isnumeric())
# print(num3.isnumeric())
# print(num4.isnumeric())
 
 
 
 
#is其他
# name=‘egon123‘
# print(name.isalnum()) #字符串由字母和数字组成
# name=‘asdfasdfa sdf‘
# print(name.isalpha()) #字符串只由字母组成
#
 
# name=‘asdfor123‘
# print(name.isidentifier())
name=‘egGon‘
print(name.islower())
# print(name.isupper())
# print(name.isspace())
name=‘Egon say‘
print(name.istitle())

字符串及用法


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