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Yes, that's the rule in Python (and in many other programming languages, as well).
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There are many programming languages in which you can write dynamic web pages - python, PHP, java, etc. A very simple example is given in the PHP tutorial for beginners - see related links.
For websites: HTML JavaScript Ajax PHP, and you can embed application-making languages inside these pages: Flash or Java Other very common languages: C++ C# C Haskell Perl Python Objective-C(for Mac programming) etc. And many more...
You can find the book Programming Python on Alibris, Download 366, Amazon, Google, Barnes and Noble, Coderholic and other sites. You can also pick it up or order it from your local bookstore.