Understanding Python's "with" statement Fredrik Lundh | October 2006 | Originally posted to online.effbot.org Judging from comp.lang.python and other forums, Python 2.5’s new with statement (dead link) seems to be a bit confusing even for experienced Python programmers. As most other things in Python, the with statement is actually very simple, once you understand the problem it’s trying to solve. Consider this piece of code: set things up try: do something finally: tear things down Here, “set things up” could be opening a file, or acquiring some sort of external resource, and “tear things down” would then be closing the file, or releasing or removing the resource. If you do this a lot, it would be quite convenient if you could put the “set things up” and “tear things down” code in a library function, to make it easy to reuse. def controlled_execution(callback): set things up try: callback(thing) finally: tear things down def my_function(thing): do something controlled_execution(my_function) This wasn’t very difficult, was it?
The Jython Project IronPython Tutorial - Learn Python in 10 minutes - Stavros' Stuff NOTE: If you would like some Python development done, my company, Stochastic Technologies, is available for consulting. This tutorial is available as a short ebook. The e-book features extra content from follow-up posts on various Python best practices, all in a convenient, self-contained format. All future updates are free for people who purchase it. Preliminary fluff So, you want to learn the Python programming language but can't find a concise and yet full-featured tutorial. Properties Python is strongly typed (i.e. types are enforced), dynamically, implicitly typed (i.e. you don't have to declare variables), case sensitive (i.e. var and VAR are two different variables) and object-oriented (i.e. everything is an object). Getting help Help in Python is always available right in the interpreter. >>> help(5)Help on int object:(etc etc) >>> dir(5)['__abs__', '__add__', ...] >>> abs. Syntax Python has no mandatory statement termination characters and blocks are specified by indentation. Strings
kbhomes's TextCaptchaBreaker at master - GitHub IronPython.net / Invent Your Own Computer Games with Python - Learn how to program with a free ebook programming tutorial Chapter 1 Read online: Chapter 1 - Installing Python Videos: Chapter 2 Read online: Chapter 2 - The Interactive Shell Chapter 3 Read online: Chapter 3 - Strings Download source: hello.py Copy source to clipboard: Use the online diff tool to find typos in your code: hello.py Chapter 4 Read online: Chapter 4 - Guess the Number Download source: guess.py Use the online diff tool to find typos in your code: guess.py Chapter 5 Read online: Chapter 5 - Jokes Download source: jokes.py Use the online diff tool to find typos in your code: jokes.py Chapter 6 Read online: Chapter 6 - Dragon Realm Download source: dragon.py Use the online diff tool to find typos in your code: dragon.py Chapter 7 Read online: Chapter 7 - Using the Debugger Chapter 8 Read online: Chapter 8 - Flow Charts Chapter 9 Read online: Chapter 9 - Hangman Download source: hangman.py Use the online diff tool to find typos in your code: hangman.py Chapter 10 Read online: Chapter 10 - Tic Tac Toe Download source: tictactoe.py Chapter 11 Download source: bagels.py
Python IAQ: Infrequently Answered Questions A question is infrequently answered either because few people know the answer or because it concerns an obscure, subtle point (but a point that may be crucial to you). I thought I had invented the term for my Java IAQ, but it also shows up at the very informative About.com Urban Legends site. There are lots of Python FAQs around, but this is the only Python IAQ, except for the Chinese translation of this page by Weiyang Chen, the Russian translation by Alexander Sviridenko, and the Japanese translation by Akihiro Takizawa. (There are a few Infrequently Asked Questions lists, including a satirical one on C.) What never? Wrong. (In Python notation 1j is an imaginary number, a square root of -1.) As for the first part of the question, "Polymorphism is great", I would agree, but Python sometimes makes it difficult because many Python types (such as sequence, and number) are defined informally. Literally, yes and no; but for practical purposes, no. You can. Indeed there is. Yes.
IronPython Cookbook Learning Python Programming Language Through Video Lectures One of the upcoming projects I am doing (I will reveal it in one of the next blog posts.) is going to be written entirely in Python. I have a good understanding of Python but, same as I had with JavaScript, I have little experience doing projects from the ground up in it. Update: the project was redditriver.com, read designing redditriver.com (includes full source code). Before diving into the project I decided to take a look at a few Python video lectures to learn language idioms and features which I might have not heard of. Finding Python video lectures was pretty easy as I run a free video lecture blog. First Python Lecture: Python for Programmers Interesting moments in the lecture: [07:15] There are several Python implementations - CPython, PyPy, IronPython and Jython. Okay, this talk was a very basic talk and it really was an introduction for someone who never worked in Python. Second Python Lecture: Advanced Python or Understanding Python Question and answer session: PS.