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README.md

Brython-Server

Brython-Server is a Flask-based web application focused on providing a simple Python 3 development environment where source files are hosted on Github.

You can try Brython-Server to get a feel for how it works.

Brief Instructions

When the page loads, you can begin writing Python 3 code right away. To execute your code, press the GO! button.

Github Support

To load Python 3 source code hosted on Github, you must should first log in to Github with the login button. Github will ask you to authorize Brython-Server in the next page.

To load your source, paste the Github URL of your source file or repository into the text control at the top of the page. Press <Enter> or the load button to retrieve the source from Github.

You may make any changes you want to the source code and re-run it. If you would like to save your work back to Github, just press the commit button.

Google Drive Support

To load Python 3 source code stored in your Google Drive account, you first have to give Brython-Server permission to access your account by pressing the authorize button with the Google Drive logo on it. Once you have logged in to your Google account and given Brython-Server (or the website that runs on Brython-Server) permission to access your Drive files, you will have Google Drive a load and save buttons.

The Google Drive load button directs you to a standard Google Drive file picking screen. Only compatible text files are available to pick. Once you have selected a file, the URL for the file will be displayed in the upper left edit window.

The Google Drive save button will upload any changes you have made to a file since you downloaded it, but only if you own or have edit priveleges on the file. If you didn't download a file first, the save button will prompt you for a new file name. In this case, Brython-Server will create a new file with your chosen name in the root of your Google Drive.

If you previously load-ed or refreshed an existing file from Google Drive then the save button will simply udate your file with any changes you have made since then.

Authorizing Google Drive will also add the Brython-Server app to your Google Drive. This will give you a custom new file type in Google Drive, and a custom option under the Google Drive Open with context menu.

Note: files that were not created by Brython-Server may not be opened from the load button unless you previously opened them with the Google Drive Open with context menu.

Note: you may access (but not modify) any public Github or Google Drive Python source file without logging in to Github, Google, or creating an account. You can edit the source file locally in your browser but will not be able to commit any changes unless you are logged in and have priveleges to do so.

Turtle

Brython-Server supports the Python turtle to the extent that it is supported by the underlying Brython interpreter. Its usage is simple, but slightly non-standard. For example:

from brythonserver import turtle
t = turtle.Turtle()
t.forward(100)
t.right(90)
t.forward(100)
turtle.done()

Ggame

Brython-Server includes built-in support for the Ggame graphics engine. For example, a trivial program from the Ggame documentation:

from ggame import App, ImageAsset, Sprite

# Create a displayed object at 100,100 using an image asset
Sprite(ImageAsset("bunny.png"), (100, 100))
# Create the app, with a default stage
APP = App()
# Run the app
APP.run()

Deployment

The best way to install Brython-Server is with pip and virtualenv. Create and activate your virtual environment then install Brython-Server with:

pip install brython-server

Requirements

The essential requirements for Brython-Server are met when you install with pip. In addition, you will need to install redis and, for a production install, gunicorn.

Brython-Server will use Brython as its Python interpreter and and Ggame as its graphics engine. The correct versions of each will automatically be used when you install Brython-Server using pip.

Environment Variables

A full Brython-Server installation that is capable of interacting with Github should have several environment variables set for production use:

Required for Github functionality:

  • githubtoken (an optional Github personal access token)
  • githubsecret (Github oauth secret)
  • githubclientid (Github oauth client id)

Required for Google Drive functionality:

  • googleclientid (Google Client ID)
  • googleapikey (Google API Key. Brython Server requires the drive/files and filePicker APIs)
  • googleappid (Google Application ID)

Required for creating a "personalized" Brython-Server instance:

  • sitetitle (A string that will be displayed as the "name of the site")
  • sitecontact (An e-mail address to use for contact)
  • siteurl (A full URL to the website)
  • flasksecret (A Flask application secret key)

Required for connecting to a non-standard Redis instance:

  • redishost (An IP address)
  • redisport (The port number)

Note: to generate a unique, random Flask secret key, enter the following in a Python console:

>>> import os
>>> os.urandom(24)

Use the string that results as the value of the flasksecret environment variable.

Execution

To run the server in stand-alone development mode (never in production!) execute (for example) from the Python 3 shell:

Python 3.7.0 (default, Oct  4 2018, 21:19:26)
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from brythonserver.main import APP
Update Brython scripts to verion 3.7.3
>>> APP.run(host="0.0.0.0", port=3000)
 * Serving Flask app "brythonserver.main" (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: off
 * Running on http://0.0.0.0:3000/ (Press CTRL+C to quit)

To run the server in a production environment, use gunicorn:

$ gunicorn -b 0.0.0.0:3000 -w 4   brythonserver.main:APP
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