March 2022
Intermediate to advanced
522 pages
13h 52m
Chinese
Content preview from Python语言及其应用（第2版）
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306
｜
第
17
章
上面的调用返回了两个元组：第一个用于
UDP
，第二个用于
TCP
（
2, 1, 6
中的
6
表示的
就是
TCP
）。
也可以只返回
TCP
信息或
UDP
信息：
>>> socket.getaddrinfo('www.oreilly.com', 80, socket.AF_INET,
socket.SOCK_STREAM)
[(2, 1, 6, '', ('104.89.46.106', 80))]
IANA
为某些服务保留了部分
TCP
端口号和
UDP
端口号，这些端口号与服务名称相关联。
例如，
HTTP
的服务名称为
http
，被分配了
TCP
端口号
80
。
下列函数可以在服务名称和端口号之间转换。
>>> import socket
>>> socket.getservbyname('http')
80
>>> socket.getservbyport(80)
'http'
17.5.2 Python
电子邮件模块
标准库包含下列电子邮件模块。
•
smtplib
可以通过
SMTP
（
simple mail transfer protocol
，简单邮件传输协议）发送电子邮
件消息。
•
email
用于创建和解析电子邮件消息。
•
poplib
可以通过
POP3
（
post office protocol 3
，邮局协议
3
）读取电子邮件。
•
imaplib
可以通过
IMAP
（
Internet message access protocol
，互联网消息访问协议）读取
电子邮件。
如果你想编写自己的
Python SMTP
服务器，那么不妨试试 ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.