一个奇怪的现象，我写下了一个input.py 内容如下：

#!/usr/bin/env python3

name=input("please enter your name:")
print("hello,",name)

执行的时候却是：

$ python input.py
please enter your name:ghf
Traceback (most recent call last):
  File "input.py", line 3, in <module>
    name=input("please enter your name:")
  File "<string>", line 1, in <module>
NameError: name 'ghf' is not defined

为什么会这样呢? 换成

name=raw_input("please enter your name:")

就可以