【python】字符串的用法阶进

字符串的格式¶

s1= r'abcd' #raw,原始数据
s2= u'abcd' #unicode 数据

他们的区别：

s1= r'\nabcd'
s2= u'\nabcd'
print s1
print s2
print len(s1)
print len(s2)

如何让字符串中含有引号 ",'

s3=""" """
S3= """ hello,say:'world'..."""

内置函数¶

find

s1 = "hello"
l = s1.find("l")

replace

 
>>> s1.replace('l','bc')
'hebcbco'

split

s1 ="name:john,age:23,job:jeapedu" 
l1= s1.split(',')
l2=l1[0].split(":")

strip 去掉 首尾' ' ,'\n'

s = 'hello\n\n\n'
print len(s)
s = s.strip()
print len(s)

不能删除中间的' ' ,'\n'

In [33]: s = ' hello\n\n '
In [34]: s = s.strip()
In [35]: print len(s)
5
In [36]: s = ' hel lo\n\n '
In [37]: print len(s)
10
In [38]: s = s.strip()
In [39]: print len(s)
6