简单讲解Python中的字符串与字符串的输入输出
字符串
字符串用''或者""括起来，如果字符串内部有‘或者"，需要使用\进行转义
>>> print 'I\'m ok.' I'm ok.
转义字符\可以转义很多字符，比如\n表示换行，\t表示制表符，字符\本身也要转义，所以\\表示的字符就是\。当然如果不需要转义，可以使用r''：
>>> print '\\\t\\' \ \ >>> print r'\\\t\\' \\\t\\
如果字符串内部有很多换行，用\n写在一行里不好阅读，为了简化，Python允许用'''…'''的格式表示多行内容:
>>> print '''line1 ... line2 ... line3''' line1 line2 line3
如果写成程序，就是：
print '''line1 line2 line3'''
可能出现的问题
中文编码问题
# coding = utf-8
结果报错：
SyntaxError: Non-ASCII character ‘/xe6'
所以最后改成了
# coding=utf-8
唉....
Unicode编码问题
Python 2.7.6 (default, Mar 22 2014, 22:59:56)
[GCC 4.8.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> len('中文')
6
>>> len(u'中文')
2
>>>
注意： 这个问题是由python编码导致的，详细的编码问题详见字符串和编码，但是在python 3.x中这个编码问题就不存在了：
Python 3.4.0 (default, Jun 19 2015, 14:20:21)
[GCC 4.8.2] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> len('中文')
2
>>> len(u'中文')
2
>>>
输出
>>> print 'hello, world' hello, world >>> print 'The quick brown fox', 'jumps over', 'the lazy dog' The quick brown fox jumps over the lazy dog >>> print '100 + 200 =', 100 + 200 100 + 200 = 300
输入
>>> name = raw_input()
Michael
>>> name
'Michael'
>>> print name
Michael
>>> name = raw_input('please enter your name: ')
please enter your name:
注意： raw_input返回的永远是字符串，也就是说你输入一个int型，返回的是一个数字字符串，你需要进行转换：
>>> number = raw_input("输入一个整数：")
输入一个整数：123
>>> number
'123'
>>> number = int(raw_input("输入一个整数："))
输入一个整数：123
>>> number
123
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