x = '       jiahuifeng    '

print(x.strip(' '))

print(x.lstrip(' '))

print(x.rstrip(' '))

x = 'jiahuifeng'

print(x.lower())

print(x.upper())

x = 'fengjiahui_haha'

print(x.startswith('fe'))

print(x.endswith('_haha'))

print('My name is %s,my age is %s' %('jiahuifeng',18))

print('{} {} {}'.format('jiahuifeng',18,'male'))

name='root:x:0:0::/root:/bin/bash'

print(name.split(':')) #默认分隔符为空格

name='C:/a/b/c/d.txt' #只想拿到顶级目录

print(name.split('/',1))

name='a|b|c'

print(name.rsplit('|',1)) #从右开始切分

name = '''ab c

de fgkl

sadfewf'''

print (name.splitlines())

name=' '

print(tag.join(['egon','say','hello','world']))

-->egon say hello world

name='jiahuifeng say :i have one apple,my name is jiahuifeng'

print(name.replace('jiahuifeng','qiqi',1))

x = 'jiahuifeng'

y = 'shi'

z = 'haha'

name = x+y+z

print(name)