python输入输出---input,raw_input

Python 2.3.4 (#1, Feb  2 2005, 11:44:13)   
[GCC 3.4.3 20041212 (Red Hat 3.4.3-9.EL4)] on linux2  
Type "help", "copyright", "credits" or "license" for more information.  
>>> user=raw_input("please input:")         
please input:wei                          #  raw_input 输入  字符串  成功  
>>> user  
'wei'  
>>> user=input("please input:")            
please input:123                          #  input 输入  数字  成功（返回的是数字）  
>>> user  
123  
>>> user=raw_input("please input:")  
please input:111 <span style="white-space:pre">         </span>  #  raw_input 输入  数字  成功（返回的还是当成字符串）  
>>> user  
'111'  
>>> user=input("please input:")  
please input:wei                          #  input  输入字符串   失败  
Traceback (most recent call last):  
  File "<stdin>", line 1, in ?  
  File "<string>", line 0, in ?  
NameError: name 'wei' is not defined  

在Python 3.2.3中  input和raw_input 整合了，没有了raw_input

Python 3.2.3 (default, Apr 11 2012, 07:15:24) [MSC v.1500 32 bit (Intel)] on win  
32  
Type "help", "copyright", "credits" or "license" for more information.  
>>> user=raw_input("please input:")                 #没有了raw_input  
Traceback (most recent call last):  
  File "<stdin>", line 1, in <module>  
NameError: name 'raw_input' is not defined  
>>> 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'