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What is py4web?

.. image:: :target:

PY4WEB is a web framework for rapid development of efficient database driven web applications. It is an evolution of the popular web2py framework but much faster and slicker.

  • Main web site:
  • GitHub repository:
  • Official documentation site:
  • License:
    BSD-3-Clause License 


Running py4web

.. image:: docs/images/first_run.png

The main Dashboard

.. image:: docs/images/dashboard_main.png

Editing a file in the Dashboard

.. image:: docs/images/dashboard_edit.png

Editing a database in the Dashboard

.. image:: docs/images/dashboard_restapi.png


PY4WEB runs fine on Windows, MacOS and Linux. There are many installation procedures (see the official documentation for details) but only two of them are summarized here.

The simplest way to install py4web is using binaries, but it's only available for Windows and MacOS. It's meant especially for newbies or students, because it does not require Python pre-installed on your system nor administrative rights. You just need to download the latest Windows or MacOS ZIP file from

this external repository 
__. Unzip it on a local folder and open a command line there. Finally run the commands (omit './' if you're using Windows)

.. code:: bash

./py4web-start set_password ./py4web-start run apps

The standard installation procedure for py4web on Windows, MacOS and Linux is using pip. Its only prerequisite is Python 3.6+.

.. code:: bash

python3 -m pip install --upgrade py4web --no-cache-dir --user

but do not type the ''--user'' option with virtualenv or a standard Windows installation which is already per-user. Also, if ''python3'' does not work, try with the simple ''python'' command instead.

This will install the latest stable release of py4web and all its dependencies on the system's path only. After the installation you'll be able to start py4web on any given working folder with

.. code:: bash

py4web setup apps py4web set_password py4web run apps

Launch Arguments

.. code-block:: none

# py4web run -h


  Run all the applications on apps_folder

Options: -Y, --yes No prompt, assume yes to questions [default: False]

-H, --host TEXT Host name [default:] -P, --port INTEGER Port number [default: 8000] -p, --password_file TEXT File for the encrypted password [default: password.txt]

-s, --server [default|wsgiref|tornado|gunicorn|gevent|waitress|geventWebSocketServer|wsgirefThreadingServer] server to use [default: default] -w, --numberworkers INTEGER Number of workers [default: 0] -d, --dashboardmode TEXT Dashboard mode: demo, readonly, full (default), none [default: full]

--watch [off|sync|lazy] Watch python changes and reload apps automatically, modes: off (default), sync, lazy --sslcert PATH SSL certificate file for HTTPS --sslkey PATH SSL key file for HTTPS -help, -h, --help Show this message and exit.


.. code:: bash

py4web run -H -P 8000 -d demo apps

Note that since the default (as specified above) for the host and port are and 8000 respectively, the above command can be shortened to:

.. code:: bash

py4web run -d demo apps

Note also that the optional ''usegevent'' directive must be used with ''gevent'' or ''geventWebSocketServer'' webservers and shouldn't be used with ''tornado'' and ''waitress''.


py4web is a WSGI application. To obtain the WSGI app simply do:

.. code:: bash

from py4web.core import wsgi application = wsgi()

The wsgi function takes arguments with the same name as the command line arguments.

Tell me more

  • it is 10-20x faster than web2py
  • this is a work in progress and not stable yet but close to being stable
  • python3.6+ only
  • uses (same DAL as web2py)
  • uses (same as web2py but defaults to [[...]] instead of {{...}} delimiters)
  • uses the same validators as web2py (they are in pyDAL)
  • uses the very similar helpers to web2py (A, DIV, SPAN, etc.)
  • uses for i18n and pluralization
  • request, response, abort are from
  • HTTP and redirect are our own objects
  • like web2py, it supports static asset management /{appname}/static/_0.0.0/{path}
  • implements sessions in cookies (jwt encrypted), db, memcache, redis and custom
  • implements a cache.memoize (Ram cache with O(1) access)
  • supports multiple apps under apps folder (same as web2py)
  • unlike web2py does not use a custom importer or eval
  • admin has been replaced by a _dashboard
  • appadmin has been replaced by dbadmin (within _dashboard)
  • auth logic is implemented via a "auth" vue.js custom component
  • SQLFORM has been replaced by py4web/utils/
  • it comes with a Grid object providing simple grid and CRUD capabilities
  • there are not enough tests


py4web is supported by a growing community of developers and even simple users. Many thanks to everybody, and especially:

.. inclusion-marker-do-not-remove

  • Massimo Di Pierro 
  • Cassio Botaro 
  • Dan Carroll 
  • Jim Steil 
  • John M. Wolf 
  • Micah Beasley 
  • Nico Zanferrari 
  • Pirsch 
  • sugizo 
  • valq7711 

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