== Install a Development Environment ==
InstallationGuidelinesDeveloper

== Python ==
Indentation matters (use 4 spaces instead of Tabs)
 * http://diveintopython.org/
 * http://openbookproject.net/thinkcs/python/english2e/
 * Style Guide: http://www.python.org/dev/peps/pep-0008/

== Web2Py ==
This is an [http://en.wikipedia.org/wiki/Model-view-controller MVC] environment (like [http://mdp.cti.depaul.edu/AlterEgo/default/show/103 Rails] & [http://mdp.cti.depaul.edu/AlterEgo/default/show/101 Django]).

Web2Py can work at several different levels of abstraction.[[BR]]
The !SahanaPy framework (S3) is built on Web2Py's Auth/Crud classes in {{{tools.py}}} (with some remnants of the older T2), however sometimes we need more control therefore need to drop down a level or two.[[BR]]
 * http://web2py.com/examples/default/docs (recommend the 'New Cookbook' until version 2 of the official book comes out)

Recommend using the CLI to try out code snippets in the Web2Py environment (gluon, Model):
{{{
python web2py.py -S sahana -M
}}}
=== Model ===
Defines databases in: {{{/models/module.py}}}

The Models are loaded 1st within Web2Py processing, before the controllers.[[BR]]
So you can import any global modules/set any global variables here.[[BR]]
The Models are imported in alphabetical order, so we load the files which other modules depend on 1st, hence naming them appropriately:[[BR]]{{{00_db.py}}}, {{{01_RESTlike_controller.py}}}, {{{02_pr.py}}}, {{{03_gis.py}}}

=== Controller ===
Python functions in {{{/controllers/module.py}}} [[BR]]
e.g.
{{{
   def list_records():
       items=t2.itemize(table)
       return dict(items=items)
}}}    

=== View ===
HTML/Javascript templates in {{{/views/module/function.html}}}
 * these are normal HTML/JS files with the ability to add in Python code (e.g. variables) surrounded by brackets: {{ interpreted python here }}
 * there should be an .html file available for each function in the module (name normally being the same as the function)
 * these normally inherit from {{{views/layout.html}}} which also includes the !JavaScript from {{{views/*_ajax.html}}}
 * if there is no view defined then a default view will be displayed, which will show the values of all the data it can see, but not be formatted nicely

Static CSS/Javascript files are stored in {{{/static}}}

 * [wiki:DeveloperGuidelinesS3Framework SahanaPy Framework: S3]
 * [wiki:DeveloperGuidelinesInternationalisation Internationalisation]
 * [wiki:DeveloperGuidelinesSahana2Migration Help for Developers Migrating from Sahana2]
 * [wiki:DeveloperGuidelinesNewModule How to add a new Module?]

 * [wiki:DeveloperGuidelinesBzr Using Bzr]

 * [wiki:DeveloperGuidelinesGIS GIS]
 * [wiki:DeveloperGuidelinesLibraries Libraries]
 * [wiki:DeveloperGuidelinesWebServices Web Services]

 * [wiki:DeveloperGuidelinesArchitecture Architecture]
 * [wiki:DeveloperGuidelinesDocumentation Documentation]
 * [wiki:DeveloperGuidelinesTesting Testing]
 * [wiki:DeveloperGuidelinesOptimisation Optimisation]
 * [wiki:DeveloperGuidelinesReleaseProcess Release Process]

 * [wiki:DeveloperGuidelinesTips Tips] - useful links to explore

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