KivyPie and python3

[mwwn]

Hi,

is there an easy way to use python3 and kivy on KivyPie? It doesn't seem to be installed by default and the obvious ways (apt get install python3-kivy) lead to the message

[INFO   ] Kivy v1.8.0
[INFO   ] [Logger      ] Record log in /home/sysop/.kivy/logs/kivy_16-01-15_6.txt
[DEBUG  ] [Cache       ] register <kv.image> with limit=None, timeout=60s
[DEBUG  ] [Cache       ] register <kv.atlas> with limit=None, timeout=Nones
[INFO   ] [Image       ] Providers: img_tex, img_dds, img_gif (img_pygame, img_pil ignored)
[DEBUG  ] [Cache       ] register <kv.texture> with limit=1000, timeout=60s
[DEBUG  ] [Cache       ] register <kv.shader> with limit=1000, timeout=3600s
[INFO   ] [Factory     ] 157 symbols loaded
[DEBUG  ] [Cache       ] register <kv.lang> with limit=None, timeout=Nones
[DEBUG  ] [Window      ] Ignored <egl_rpi> (import error)
[DEBUG  ] [Window      ] Ignored <pygame> (import error)
[WARNING] [WinPygame   ] SDL wrapper failed to import!
[DEBUG  ] [Window      ] Ignored <sdl> (import error)
[DEBUG  ] [Window      ] Ignored <x11> (import error)
[CRITICAL] [Window      ] Unable to find any valuable Window provider at all!
[CRITICAL] [App         ] Unable to get a Window, abort.

[batr...@gmail.com]

Hi mwwn,

Yes, I wanted to run python3 with kivy too.

Here's what I did on the kivypie distro:

1. sudo apt-get update

2. vi /etc/fstab and change the /tmp size from 16m to 200m (otherwise you won't be able to build cython, etc.)

3. sudo apt-get install python3-pip 

4. sudo pip3 install cython (took a while to build!)

5. sudo pip install git+https://github.com/kivy/kivy.git@master

You should now see packages in /usr/local/lib/python3.4/dist-packages and you can now run the examples using python3.

Thanks,

-Raj

[Albert]

Thanks for the update, Raj,

I'll be releasing a new version built on Python 3 soonish !

Albert

[batr...@gmail.com]

Thanks, Albert I look forward to it! 

BTW, small fix in my response - in step 5). It should be pip3 (not pip). I.e. sudo pip3 install git+https://github.com/kivy/kivy.git@master

-Raj

[deve...@appsdesignlab.com]

Hi I'm trying to upgrade Kivy to use Python3 ...

Followed the instructions as stated by Raj in this thread... it worked fine... but it yielded no difference...

$ kivy

Python 2.7.9 (default, Mar  8 2015, 00:52:26) 

[GCC 4.9.2] on linux2

Type "help", "copyright", "credits" or "license" for more information.

>>> 

Kivy still uses Python 2.7.9

[r...@kaos.stanford.edu]

Hmm, I never launched kivy that way (I usually just type python3). I see that kivy is a symbolic link to /usr/bin/python2.7.

You could do a similar thing by creating a kivy3 link by entering the command: sudo ln -s /usr/bin/python3 /usr/bin/kivy3

You can then launch it by typing kivy3 to be consistent.

Thanks,

-Raj

[Albert]

Thanks guys. I have built a new Kivypie image with python3.

I haven't had the time to even test it, if you could give it a try and let me know that'd be tops!

Should boot on the PI3 too.

http://kivypie.mitako.eu/kivy-pie-0.9.zip

Albert

[r...@kaos.stanford.edu]

Hi Albert,

When I launch python3 or kivy at the command line, then do an import kivy, I get an ImportError: No module named 'kivy'

Thanks,

-Raj

[Albert]

Thanks Raj! sorry about that. Wrong compilation method :)

Should be working on this new release:

 * http://kivypie.mitako.eu/kivy-pie-0.9a.zip

kivy loads python3, python loads python2.

Albert

[dr.vika...@gmail.com]

Hi Albert,

I downloaded the latest release (0.9b) and it works fine on Raspberry Pi 3 & official display.  But I have some older apps that work with python2.  What is the easiest way to revert back to have the default be python 2 instead of python3?

Thanks,

Vikas

[Albert]

Hi Vikas,

On top of my head... sudo ln -sfv /usr/bin/kivy /usr/bin/python2.7

Or... sudo ln -sfv /usr/bin/kivy2 /usr/bin/python2.7, and change your main kivy app's shebang.

But I suspect some things will go wrong at runtime...

Ideally, Kivy debian packages should be produced from Kivypie builds, I think.

This would make it more practical, and portable across other RPi distros as well.

Albert

[r...@kaos.stanford.edu]

Wouldn't 'python mykivyprogram.py' be sufficient to run under 2.7 and 'python3 mykivyprogram.py' for 3.x?

-Raj

[Albert]

On kivypie 0.9b, kivy command points python3, python points to python 2 by default.

So yeah, depends on how you launch your apps.

Does it actually run kivy apps built for python2 with no issues?

Albert