raw_input() 将所有输入作为字符串看待，返回字符串类型。
而 input() 在对待纯数字输入时具有自己的特性，它返回所输入的数字的类型（ int, float ）
intput()
print "Who do you think I am?"
user = input("please input")
print user
如果这个时候输入 字符串 会报错
================= RESTART: C:\Python27\Tools\Scripts\xulu.py =================
Who do you think I am?
please input: swift
Traceback (most recent call last):
File "C:\Python27\Tools\Scripts\xulu.py", line 2, in <module>
user = input("please input ")
File "<string>", line 1, in <module>
NameError: name "swift" is not defined
如果加上引号就可以了
================ RESTART: C:\Python27\Tools\Scripts\xulu.py =================
Who do you think I am?
please input "swift"
swift
raw_input()
print "Who do you think I am?"
user = raw_input("please input: ")
print user
字符串不需要加引号
================= RESTART: C:\Python27\Tools\Scripts\xulu.py =================
Who do you think I am?
please input: swift
swift
在python3.2.3中 input和raw_input 整合了，没有了raw_input*
>>> user=input("please input:")
please input:wei
>>> user
'wei'
>>> user=input("please input:") #input的输出结果都是作为字符串
please input:123
>>> user
'123'
