擅长:python、mysql、java
<p>从<a href="http://docs.python.org/library/socket.html" rel="noreferrer">^{<cd1>} documentation</a>:</p>
<blockquote>
<p>A pair (host, port) is used for the AF_INET address family, where host is a string representing either a hostname in Internet domain notation like 'daring.cwi.nl' or an IPv4 address like '100.50.200.5', and port is an integer.</p>
</blockquote>
<p>所以第二个值是客户端用于连接的端口号。建立TCP/IP连接时,客户端选择一个传出端口号与服务器通信;服务器返回的数据包将被发送到该端口号。</p>