mac 下python import总是报错?报错

报错信息：

wangyujiadeMacBook-Pro:documents wangyujia$ python server.py

<p style="font-size:11px;font-family:Menlo;">
	<span style="line-height:1.5;">Traceback (most recent call last):</span>
</p>
<p style="font-size:11px;font-family:Menlo;">
	  File "server.py", line 23, in <module>
</p>
<p style="font-size:11px;font-family:Menlo;">
	    getInfo()
</p>
<p style="font-size:11px;font-family:Menlo;">
	  File "server.py", line 7, in getInfo
</p>
<p style="font-size:11px;font-family:Menlo;">
	    sock=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
</p>
<p style="font-size:11px;font-family:Menlo;">
	AttributeError: 'module' object has no attribute 'AF_INET'
</p>
<p style="font-size:11px;font-family:Menlo;">
	wangyujiadeMacBook-Pro:documents wangyujia$ python server.py
</p>
<p style="font-size:11px;font-family:Menlo;">
	Traceback (most recent call last):
</p>
<p style="font-size:11px;font-family:Menlo;">
	  File "server.py", line 23, in <module>
</p>
<p style="font-size:11px;font-family:Menlo;">
	    getInfo()
</p>
<p style="font-size:11px;font-family:Menlo;">
	  File "server.py", line 7, in getInfo
</p>
<p style="font-size:11px;font-family:Menlo;">
	    sock=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
</p>
<p style="font-size:11px;font-family:Menlo;">
	AttributeError: 'module' object has no attribute 'AF_INET'
</p>

server.py 源码：

#!/usr/bin/env python

<p style="font-size:11px;font-family:Menlo;color:#008400;">
	#-*-coding:utf-8-*-
</p>
<p style="font-size:11px;font-family:Menlo;">
	<br>
</p>
<p style="font-size:11px;font-family:Menlo;">
	import socket
</p>
<p style="font-size:11px;font-family:Menlo;">
	def getInfo():
</p>
<p style="font-size:11px;font-family:Menlo;color:#272AD8;">
	<span> </span>address=('127.0.0.1',8888)
</p>
<p style="font-size:11px;font-family:Menlo;">
	<span> </span>sock=socket.socket(socket.AF_INET,socket.SOCK_STREAM)
</p>
<p style="font-size:11px;font-family:Menlo;">
	<span> </span>sock.bind(address)
</p>
<p style="font-size:11px;font-family:Menlo;">
	<span> </span>sock.listen(5)
</p>
<p style="font-size:11px;font-family:Menlo;">
	<span> </span>
</p>
<p style="font-size:11px;font-family:Menlo;">
	<span> </span>client,addr=sock.accept()
</p>
<p style="font-size:11px;font-family:Menlo;color:#272AD8;">
	<span> </span>print 'connected with',addr
</p>
<p style="font-size:11px;font-family:Menlo;">
	<span> </span>
</p>
<p style="font-size:11px;font-family:Menlo;color:#272AD8;">
	<span> </span>client.send(b'Hi I am server!')
</p>
<p style="font-size:11px;font-family:Menlo;">
	<span> </span>ra=sock.recv(1024)
</p>
<p style="font-size:11px;font-family:Menlo;color:#BB2CA2;">
	<span> </span>print ra
</p>
<p style="font-size:11px;font-family:Menlo;">
	<span> </span>
</p>
<p style="font-size:11px;font-family:Menlo;">
	<span> </span>client.close()
</p>
<p style="font-size:11px;font-family:Menlo;">
	<span> </span>sock.close()
</p>
<p style="font-size:11px;font-family:Menlo;color:#008400;">
	#end def
</p>
<p style="font-size:11px;font-family:Menlo;">
	<br>
</p>
<p style="font-size:11px;font-family:Menlo;">
	if __name__=='__main__':
</p>
<p style="font-size:11px;font-family:Menlo;">
	<span> </span>getInfo()
</p>