2.4 python中的字符串、索引和截取 [python入门教程]

        字符串可以用单引号，双引号，三引号成对括起来，索引用[]界定，切片用[:]来省略和连接，这点类似于Matlab。

>>> s1='Python'
>>> s2=' is cool!'
>>> str=s1+s2
>>> str
'Python is cool!'
>>> str[0]
'P'
>>> str[2:5]
'tho'
>>> str[:2]
'Py'
>>> str[3:]
'hon is cool!'
>>> str*2
'Python is cool!Python is cool!'
>>> '-'*8
'--------'
>>> str[-1]
'!'

        字符串下标从0开始，最后一个字符的索引是-1。加号来连接，*用来重复。

>>> str2='Python\n is cool!'
>>> str2
'Python\n is cool!'
>>> print str2
Python
 is cool!