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Try me (from pip)

python3 -m pip install -U py4web --no-cache-dir --user
py4web setup apps
py4web set-password
py4web run apps
open http://localhost:8000/todo/index

(The apps folder will be created with some apps inside)

Try me (from source)

git clone
cd py4web
python3 -m pip install -r requirements.txt
./ setup apps
./ set-password
./ run apps
open http://localhost:8000/todo/index

Try me (install from source)

git clone
cd py4web
make assets
make test
make install
py4web run apps
open http://localhost:8000/todo/index

Notice "py4web" uses the pip installed py4web, "./" uses the local one. Do not get confused. Also notice when installing from source the content of py4web/assets is missing and it is created by make assets.

Tell me more

  • this is a work in progress and not stable yet but close to being stable
  • python3 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) Memoize
  • 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  • admin has been replaced by a _dashboard (90% done)
  • appadmin has been replaced by dbadmin (within dashboard) (90% done)
  • auth logic is implemented via a "auth" vue.js custom component (90% done)
  • SQLFORM has been replaced by py4web/utils/
  • SQLFORM.grid was been replaced by a "mtable" vue.js custom component (90% done)
  • there are not enough tests
  • it is not as stable as web2py yet
  • it is 10-20x faster than web2py


  • pydal + dbapi (done)
  • yatl (done)
  • pluralize (done)
  • auth (WIP, 90%)
  • mailer (done)
  • session (cookies, db, redis, memcache)
  • form (done up to downloads)
  • mtable (WIP, 75%)
  • dashboard (90% done)
  • scaffold (done)
  • bus (0%)
  • tornado (done)
  • gevent (done)
  • gunicorn (done)
  • bottle (done)

Storing _dashboard password

When py4web starts it asks for a _dashboard password and stores its pdkdf2 hash in password.txt, in the working folder. It will not ask again unless the file is deleted. If the --dashboard_mode is demo or none it will not ask. If you want to store it somewhere else, you can specify a name with --password_file.

You can create the file yourself with:

$ python3 -c "from pydal.validators import CRYPT; open('password.txt','w').write(str(CRYPT()(input('password:'))[0]))"
password: *****

Launch Arguments


  -Y, --yes                     No prompt, assume yes to questions
  -H, --host TEXT               Host name (default
  -P, --port INTEGER            Port number (default 8000)
  -p, --password_file TEXT      File for the encrypted password
  -w, --number_workers INTEGER  Number of workers
  -d, --dashboard_mode TEXT     Dashboard mode: demo, readonly, full
                                (default), none

  --watch [off|sync|lazy]       Watch python changes and reload apps
                                automatically, modes: off (default), sync,

  --ssl_cert TEXT               SSL certificate file for HTTPS
  --ssl_key TEXT                SSL key file for HTTPS
  --help                        Show this message and exit.


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:

py4web run -d demo apps


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

from py4web.core import wsgi
application = wsgi()

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



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