Django Dev Environment Howto

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Dev Environment How-To 29 Oct. 2013, Django Workshop @ CLBC

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Me •TP (@uranusjr) •http://uranusjr.logdown.com/pages/about •RTFD •Had a crash with Futura recently

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The (Most) Comprehensive Guide to Setting up a Development Environment for Django Projects

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The (Most) Comprehensive Guide to Setting up a Development Environment for Python Projects

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Django A Web Framework That Does Not Require a Mac

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Topics • Choose your database (carefully) • Yes, when you develop • Construct a perfect Python dev machine • Linux • OS X

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Topics • Choose your database (carefully) • Yes, when you develop • Construct a perfect Python dev machine • Linux • OS X • Windows

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Topics • Choose your database (carefully) • Yes, when you develop • Construct a perfect Python dev machine • Other things

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Database

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Just use PostgreSQL

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Why? • Free as in Freedom • Recommended by dentists core developers • Data migration

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Why? • Free as in Freedom • Recommended by core developers • Data migration

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Matching Engines • Different engines behave differently • Fixtures are not for data migration

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Engine Behaviour • A true story • Handling long strings • Type safety (if you use something raw) • Bugs on production machine are hard to ﬁnd

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Data Migration • Fixtures do not represent your data completely • They are just JSON, after all • You can't rollback loaddata • ContentTypes

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SQLite Is (Still) Useful • Easy to wipe everything and start over • Quick 'n' dirty tests • Early stages during development

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But... • MySQL is okay • Even Oracle is okay if you don't care • MariaDB • Just use it

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Python Packages

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What Version of Python Should I Use?

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Python • Anything over 2.7.0 should be enough • YUM is still based on 2.6... Oops. • Python 3 is coming…or not • Having both Python 2 and 3 installed on Windows can be a nightmare

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Setuptools and PIP • https://bitbucket.org/pypa/setuptools/raw/ bootstrap/ez_setup.py • python ez_setup.py • Modify PATH environment variable if needed • easy_install pip

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Virtualenv • pip install virtualenv • virtualenvwrapper • pip install virtualenvwrapper • pip install virtualenvwrapper-win • pip install virtualenvwrapper-powershell

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WUT? • setuptools = Python's package manager • Ever heard of distribute? • pip = Better easy_install alternative • virtualenv = Prevent Python lib pollution • virtualenvwrapper = Better virtualenv UI • Windows variants • Didi I hear somebody say APT?

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virtualenvwrapper • WORKON_HOME • Load the commands (if needed) • Commands • mkvirtualenv • workon • Read the docs

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Django and Friends • Always install packages inside virtualenv with pip • pip install django • pip install -r • pip freeze

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This is not enough.

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Python Has Limits • Database connector • Image processing • Other heavy-lifting tasks

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PostgreSQL Libs (in C) • OS X • Installer or Homebrew • Linux • Your favourite package manager • Windows • Installer

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pip install psycopg2

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Build a C Extension • Get a C compiler • Install (or compile) library to bind with • Install CPython headers • apt-get install python-dev • pip install

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Build a C Extension • Get THE ONE TRUE C compiler • Install (or compile) library to bind with • Install CPython headers • apt-get install python-dev • pip install

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Get a Compiler • apt-get install build-essential • OK, I got lazy :p • Install Xcode and its "console tools" • Install Visual Studio (Express) • The "for Windows Desktop" version • Use the correct prompt

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VS90COMNTOOLS ! VS100COMNTOOLS Until Python 3.2 Python 3.3

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VS90COMNTOOLS Visual Studio 2008

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VS100COMNTOOLS Visual Studio 2010

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set VS90COMNTOOLS=%VS110COMNTOOLS% If you have VS2012 and Python 2.7, for example

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I No Want C Compiler! • Pre-compiled binaries from the package manager • Pre-compiled binaries from the Web

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Words of Warning • Version mismatch • CPU Architecture mismatch (Windows sucks) • Security issue • Why pip doesn't offer binary installing

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From APT • apt-get install python-psycopg2 • What does it install? • http://packages.debian.org • .deb ﬁle is merely an ar archive • ln -s everything into $ENV/lib/site-packages

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Pre-Built Installer • http://www.lfd.uci.edu/~gohlke/pythonlibs/ • Simply a compressed archive (usually gzip) • Viewable with 7-Zip or similar • easy_install • Use where to make sure

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Miscellaneous • http://rudix.org has pre-built packages for OS X • I never used it, to be honest :p • RPM packages can be converted with rpm2cpio and then extracted with cpio • Actually you can use MinGW • Why? • If you really know what you're doing

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Questions?