Foundations of Python Network Programming, 2nd Edition: The by John Goerzen, Brandon Rhodes

By John Goerzen, Brandon Rhodes

You are going to research basics like IP, TCP, DNS and SSL through the use of operating Python courses; additionally, you will be capable of get yourself up to speed with infrastructure elements like memcached and message queues. you can even delve into community server designs, and evaluate threaded techniques with asynchronous event-based recommendations. however the greatest switch is that this edition's improved therapy of the internet. The HTTP protocol is roofed in broad aspect, with every one function followed by means of pattern Python code. you should use your HTTP protocol services by way of learning a whole bankruptcy on display scraping and you may then attempt lxml and BeautifulSoup opposed to a real-world website.

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Additional resources for Foundations of Python Network Programming, 2nd Edition: The comprehensive guide to building network applications with Python

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When making decisions about defining port numbers, like 53 for the DNS, the IANA thinks of them as falling into three ranges—and this applies to both UDP and TCP port numbers: • “Well-Known Ports” (0–1023) are for the most important and widely-used protocols. On many Unix-like operating systems, normal user programs cannot use these ports, which prevented troublesome undergraduates on multi-user machines from running programs to masquerade as important system services. Today the same protections apply when hosting companies hand out commandline Linux accounts.

Like most details of the operation of the Internet Protocol, your operating system prefers to take care of them itself, hiding the details both from you and your Python code. Actually, the addressing situation can be a bit more complex these days than the simple scheme just described. Because the world is beginning to run out of 4-byte IP addresses, an extended address scheme, called IPv6, is being deployed that allows absolutely gargantuan 16-byte addresses that should serve humanity’s needs for a very long time to come.

255 address is used to create a “broadcast packet” that addresses all of the hosts on the subnet (as we will see in the next chapter), which leaves 254 addresses free to actually be assigned to computers. 1 is very often used for the gateway that connects the subnet to the rest of the Internet, but some companies and schools choose to use another number for their gateways instead. info CHAPTER 1 ■ INTRODUCTION TO CLIENT/SERVER NETWORKING In nearly all cases, your Python code will simply rely on its host operating system to make packet routing choices correctly—just as it lets the operating system resolve host names to IP addresses in the first place.

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Foundations of Python Network Programming, 2nd Edition: The by John Goerzen, Brandon Rhodes
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