Overview — Python v3.2.2 documentation. The Hitchhikers Guide to Python! — pythonguide 0.0.1 documentation. Greetings, Earthling! Welcome to The Hitchhiker’s Guide to Python. This is a living, breathing guide. If you’d like to contribute, fork us on GitHub! This handcrafted guide exists to provide both novice and expert Python developers a best practice handbook to the installation, configuration, and usage of Python on a daily basis. This guide is opinionated in a way that is almost, but not quite, entirely unlike Python’s official documentation. You won’t find a list of every Python web framework available here.
Note The use of Python 3 is highly preferred over Python 2. Let’s get started! Getting Started with Python New to Python? Properly Install Python on your system: Using Virtualenvs with Pipenv: Python Development Environments This part of the guide focus on the Python development environment, and the best-practice tools that are available for writing Python code. Writing Great Python Code This part of the guide focuses on the best-practices for writing Python code. Shipping Great Python Code. Hitchhiker's Guide to Python « late.am.
I first heard about The Hitchhiker’s Guide to Python at PyCodeConf a few months ago. It’s a fantastic idea: open source, community-driven documentation on how to do Python right: everything from how to learn Python, to how to write idiomatic code, to how to distribute your projects, to surveys of best-of-breed open source projects and libraries you can build projects and applications on top of. Many many thanks to Kenneth Reitz for creating and maintaining the project, which is hosted at GitHub. At this time, the Hitchhiker’s guide is a little rough around the edges: many sections are only outlined, and need content written; other sections may not even exist yet. We can safely consider it a first draft, or, if you prefer, an alpha. This sort of undertaking is effectively impossible for one person to maintain—one person can’t possibly know of every project, library, and idiom.
Thanks to everyone who’s helping to make Python a better place! Python Tutorials, more than 300, updated March 2, 2009 and carefully sorted by topic and category. Planet Python. Labs :: Python beginner's mistakes. Every Python programmer had to learn the language at one time, and started out as a beginner. Beginners make mistakes. This article highlights a few common mistakes, including some I made myself. Beginner's mistakes are not Python's fault, nor the beginner's. They're merely a result of misunderstanding the language. However, there is a difference between misunderstanding (often subtle) language features, vs misunderstanding the language as a whole, and what can (and cannot) be done with it. The pitfalls article focused on the former; this article deals with the latter.
To put it another way, the mistakes in this article are often cases of "the wrong tool for the job", rather than coding errors or sneaky language traps. Mistake 1: trying to do low-level operations Python is sometimes described as a VHLL, a Very High-Level Language. This doesn't mean that it isn't possible to do these things with Python; but it's probably just not the right language for these jobs. Some advice. Dive Into Python. Lesson 10 - File I/O. Introduction Last lesson we learnt how to load external code into our program. Without any introduction (like what I usually have), let's delve into file input and output with normal text files, and later the saving and restoring of instances of classes.
(Wow, our lingo power has improved greatly!) Opening a file To open a text file you use, well, the open() function. Seems sensible. You pass certain parameters to open() to tell it in which way the file should be opened - 'r' for read only, 'w' for writing only (if there is an old file, it will be written over), 'a' for appending (adding things on to the end of the file) and 'r+' for both reading and writing. Code Example 1 - Opening a file openfile = open('pathtofile', 'r') openfile.read() That was interesting. Seek and You Shall Find Did you try typing in print openfile.read()? Whence is optional, and determines where to seek from. Offset decribes how far from whence that the cursor moves. for example: Try it out now. Other I/O Functions. File Management in Python. Introduction The game you played yesterday uses files to store game saves. The order you placed yesterday was saved in a file. That report you typed up this morning was, obviously, stored in a file as well.
File management is an important part of many applications written in nearly every language. Reading and Writing The most basic tasks involved in file manipulation are reading data from files and writing data to files. FileHandle = open ( 'test.txt', 'w' ) The "w" indicates that we will be writing to the file, and the rest is pretty simple to understand. FileHandle.write ( 'This is a test. This will write the string "This is a test. " to the file's first line and "Really, it is. " to the file's second line. FileHandle.close() As you can see, it's very easy, especially with Python's object orientation.
FileHandle = open ( 'test.txt', 'a' )fileHandle.write ( '\n\n\nBottom line.' )fileHandle.close() Now let's read our file and display the contents: Only the second line is displayed.