By Marty Alchin, J. Burton Browning

You’ve discovered the fundamentals of Python, yet how do you are taking your abilities to the subsequent degree? whether you recognize sufficient to be effective, there are various gains that may take you to the following point in Python. seasoned Python, moment version explores innovations and contours usually left to experimentation, permitting you to be much more efficient and creative.

In addition to natural code matters, professional Python develops your programming concepts and ways, for you to help in making you a greater Python programmer. This publication will increase not just your code but in addition your knowing and interplay with the numerous validated Python communities.

This ebook takes your Python wisdom and coding abilities to the following point. It exhibits you ways to write down fresh, leading edge code that may be revered by means of your friends. With this publication, make your code do extra with introspection and meta-programming. And research and later use the nuts and bolts of an software, tier-by-tier as a fancy case learn alongside the way.

For additional information, together with a hyperlink to the resource code referenced within the ebook, please stopover at http://propython.com/.

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Extra resources for Pro Python (2nd Edition)

Example text

Where UDP really shines, then, is where a long-term relationship will not exist between client and server, especially where there are so many clients that a typical TCP implementation would run out of memory if it had to keep up with a separate data stream for each active client. The second situation where TCP is inappropriate is when an application can do something much smarter than simply retransmit data when a packet has been lost. Imagine an audio chat conversation, for example. If a second’s worth of data is lost because of a dropped packet, then it will do little good simply to resend that same second of audio, over and over, until it finally arrives.

Instead, the client should just fill that awkward second with whatever audio it can piece together from the packets that did arrive (a clever audio protocol will begin and end each packet with a bit of heavily compressed audio from the preceding and following moments of time to cover exactly this situation) and then keep going after the interruption as though it did not occur. This is impossible with TCP, which will keep stubbornly retransmitting the lost information even when it is far too old to be of any use.

1 seconds. If you are writing a UDP client that lives a long time, think about having it remember how long the last few requests have taken to complete so that it can delay its first retry until the server has had enough time to reply. When you run the Listing 2-2 client,, give it the hostname of the other machine on which you are running the server script, as shown previously. Sometimes, this client will get lucky and get an immediate reply. 1 seconds for a reply The server says 'Your data was 23 bytes long' 26 Chapter 2 ■ UDP However, often it will find that one or more of its requests never results in replies, and it will have to retry.

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