字符串的内置方法

字符串的内置方法

重点部分

#移除空白strip
msg='             hello         '
# print(msg)
# print(msg.strip())

# msg='***hello*********'
# msg=msg.strip('*')
# print(msg)

# print(msg.lstrip('*'))
# 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

次重点部分

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

#了解部分
#expandtabs
# name='egon	hello'
# 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())