Summer of Code/2014/Proposal to port sugar core to python3

Proposal to port the Sugar core to Python 3

About me

• Name : Ravi Kumar L
• email : upman16@gmail.com
• Sugar Labs wiki username : Ravi Kumar
• IRC nickname on freenode : upman

• Education

I'm doing my second year of an under-graduate course in Computer Science and Engineering at Reva Institute of Technology and management

• First Language

I speak Tamil primarily, But I'm perfectly comfortable with English.

• Location and working hours

I'm based in Bangalore, India(UTC+5:30), I prefer to work from around late afternoon till about midnight (approximately UTC 10:30 - 18:30 )

• Skills and Experience with Open-source
  

I'm comfortable with SCM using git and proficient with Python, Ruby and C. But to be honest, I have been mostly learning and fiddling around with things up until now and never really done any proper projects or made any contributions to open-source projects. You can check out bits of my experimental code on github. But I plan on porting a dependency, telepathy-python to demonstrate that I'm capable of handling the project. I see GSoC as a wonderful opportunity to become part of a community, contribute and also learn something valuable.

About my project

Name

Polyglot port of Sugar core

Description

For sugar to be future ready, it's core has to be compatible with python 3.x . Python 2.7+ would also need to be supported for existing activities to run without a hitch. This would represent developers who prefer python 3 as well as those who prefer python 2.7+ to be able to contribute to sugar.

One approach would be to sort out python 3 support for all the dependencies, and then run 2to3 on the core code and provide a wrap around script that would handle both python 2.7+ and 3 activities. But maintaining the code could turn messy real quick. Fixing a python 3 specific bug with this kind of a setup would be really complicated.

My plan of action is to have a single easy to maintain codebase that can run on python versions 2.7 through to 3.3. Towards this end, I would automate tests to run across python2.7 - 3.3 with tox or a similar tool first, and then write polyglot code with six incrementally.

I grepped for imports on both sugar and sugar-toolkit-gtk3. A few of the modules have been renamed/relocated in python 3, but all of them are available, except for telepathy-python which as I have already said, I will be porting in the coming week.

My project would introduce no new features at all, but it would make sugar future ready and also backwards compatible. It might make development/maintenance harder on the core libraries in the short term, because the developers would need to understand the polyglot written using six. But it would provide long-term benefits and a wider potential future developer reach.

Schedule

April 21 - May 19 (Community Bonding Period)

• Research into and learn more about gtk and dbus.
• Get familiar with the codebases of sugar and sugar-toolkit-gtk3
• Look into the unit tests and determine if test cases are robust enough to support a porting effort. If required, write test cases with the help of the community and also encourage fellow GSoC-ers and developers to practice TDD.
• Discuss with the core developers and mentor(s) my initial approach I have detailed above and iron out the rough edges or discuss and decide on an alternative approach if need be.
• Research other python projects that were ported with the same approach. Contact the developers and learn about the issues they faced and I'm likely to face while porting.
• Get familiar with Tox or discuss with mentor(s) and choose a different testing framework to automate testing across python versions and get familiar with the same.
• Get to know the mechanisms of the build scripts.
• Bond with the Community. Get to know the developers responsible for writing/maintaining the sugar core, so I know whom to ask for help if I run into trouble.

May 19 - June 23 (First half of the official coding period)

• Week 1: Automate testing across python versions using the decided on approach, make all the tests pass on python 2.7.
• Week 2: Incrementally patch code on sugar toolkit with six to run on python 3.x and pass unit tests.
• Week 3: Do the same on sugar core
• Week 4 and 5: Look for and Iron out bugs and patch the bugs with unit tests so they don't pop up again.

Mid-term Evaluation

By this time, I plan to have finished writing polyglot for sugar and sugar-toolkit-gtk3

June 23 - August 11(Second half of the official coding period)

• Week 1: Add python 3.x specific dependencies into the list of things to be fetched and installed by the build scripts.
• Week 2: Write documentation on maintaining sugar core and sugar toolkit under the new setup to ease future development.
• Week 3: If the mentor(s) and the core developers are satisfied with the code and think that the codebase is solid, try and port sugar-build in the same way.

Deliverables at the end of GSoC

• Automated tests across python versions for sugar and sugar-toolkit-gtk3
• Fully python 3 compatible polyglot codebases of sugar and sugar-toolkit-gtk3
• Python 3 compatible sugar-build (optionally)

Post GSoC, I would be available to help port activities and sugar-buildbot to python 3.x and also write a porting guide for activities for developers.

Me and the community

Impact of the project At the end of my project, the testing on the sugar toolkit and the sugar core would have improved greatly and I strongly believe that a robust set of unit tests is a must for every project as it eases development. Python 3 has better unicode support and I think a lot of activities based around text would greatly benefit from porting to python 3.

• What will you do if you get stuck on your project and your mentor isn't around?

Find help on the mailing list or the IRC, or if that doesn't work out, work on a different part of the project until my mentor is available.

• How do you propose you will be keeping the community informed of your progress and any problems or questions you might have over the course of the project?

I plan to write a report every week on my blog and also discuss with people regularly over the mailing list or the IRC channel.

Miscellaneous

I've been able to setup the development environment and here's the screenshot of it with the suggested modification.

• Describe a great learning experience you had as a child.

• Is there anything else we should have asked you or anything else that we should know that might make us like you or your project more?

I would like to write a little bit about why I want to contribute to sugar in particular. Education, I believe still hasn't been modernized, we aren't making use of all the technologies we have to make learning better and more effective. I also believe that education has to be free and accessible to everyone. I think Sugar does a great job towards this and I want to be a little part of this effort to modernize education.