大家好，又见面了，我是你们的朋友全栈君。
字符串的内置方法(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
# 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())
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