By John Goerzen, Tim Bower, Brandon Rhodes
This moment variation of Foundations of Python community Programming objectives Python 2.5 via Python 2.7, the most well-liked creation types of the language. Python has made nice strides considering that Apress published the 1st variation of this ebook again within the days of Python 2.3. The advances required new chapters to be written from the floor up, and others to be widely revised. you are going to research basics like IP, TCP, DNS and SSL by utilizing operating Python courses; additionally, you will manage to get yourself up to speed with infrastructure elements like memcached and message queues. you may also delve into community server designs, and examine threaded techniques with asynchronous event-based ideas. however the largest switch is that this edition's accelerated therapy of the internet. The HTTP protocol is roofed in huge element, with every one characteristic observed through pattern Python code. you should use your HTTP protocol services through learning a complete bankruptcy on display scraping and you'll then try lxml and BeautifulSoup opposed to a real-world website. The bankruptcy on internet software programming now covers either the WSGI general for part interoperability, in addition to smooth internet frameworks like Django. eventually, all the outdated favorites from the 1st variation are again: email protocols like SMTP, POP, and IMAP get complete remedy, as does XML-RPC. you may the best way to code Python community courses utilizing the Telnet and FTP protocols, yet you are going to have fun with the facility of extra sleek choices just like the paramiko SSH2 library. while you are a Python programmer who must study the community, this is often the ebook that you really want through your aspect.
What you’ll learn
- Understand low point networking
- Handle sending and receiving e-mail together with composing and interpreting emails, SMTP, POP and IMAP
- Program the decrease degrees of internet program programming reminiscent of FastCGI and WSGI and HTTP itself
- Learn how you can use memcached and message qeues utilizing Python
- Access net providers utilizing Python
- Master multitasking with threads, forking, and asynchronous conversation
Who this ebook is for
This ebook should be of curiosity to python programmers who have to application networked functions utilizing Python. From internet software builders, to platforms integrators, to process administrators—this ebook has every little thing you must understand.
Table of Contents
- Introduction to Client/Server Networking
- UDP
- TCP
- Socket Names and DNS
- Network information and community mistakes
- TLS and SSL
- Server structure
- Caches, Message Queues, and Map-Reduce
- HTTP
- Screen Scraping
- Web functions
- E-mail Composition and deciphering
- SMTP
- POP
- IMAP
- Telnet and SSH
- FTP
- RPC
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Additional resources for Foundations of Python Network Programming: The comprehensive guide to building network applications with Python
Sample text
1: The Protocols, by W. Richard Stevens. It covers, in very fine detail, all of the protocol operations at which this book will only have the space to gesture. There are also other good books on networking in general, and that might help with network configuration in particular if setting up IP networks and routing is something you do either at work or even just at home to get your computers on the Internet. 14 CHAPTER 2 ■ UDP give us good practice with the Python network API before we move on to the additional complications that are brought by the use of TCP.
If you need persistence or a broker, then try one of the message queues that come with their own servers for moving messages between parts of your application. Use UDP only if you really want to be interacting with a very low level of the IP network stack. But, again, be sure to read this whole chapter either way, so that you know the details of what lies beneath some of your favorite protocols like DNS, real-time audio and video chat, and DHCP. 69—to every machine connected to an IP network. In fact, it does a bit more than this: a machine with several network cards connected to the network will typically have a different IP address for each card, so that other hosts can choose the network over which you want to contact the machine.
But at some point the client must decide to re-send, or it risks waiting forever. So rather than letting the operating system leave it forever paused in the recv() call, this client first does a settimeout() on the socket. timeout exception once a call has waited for that long. A call that waits for a network operation to complete, by the way, is said to “block” the caller, and the term “blocking” is used to describe a call like recv() that can make the client wait until new data arrives. When we get to Chapter 6 and discuss server architecture, the distinction between blocking and non-blocking network calls will loom very large!