Enabling tk for Python tkinter module

Enabling tk for Python tkinter module

[Chris Tapp]

I am trying to get PySimpleGUI running on an RPi4 using meta-raspberrypi with hardknott.

I have created a recipe for PySimpleGUI and added the following to my local.conf:

PACKAGECONFIG_pn-python3 = “tk”
IMAGE_INSTALL_append = " python3 python3-modules python3-pysimplegui tk"

However, the tkinter module fails to load, reporting “No module named _tkinter”, with a note above saying that Python may not be configured for Tk.

Looking on the target, /usr/lib/libtk.8.so is present.

It looks as if there is something else I need to do to get Python to build correctly, but I’m out of ideas ;-)

I’ve found a few bits on the internet that seem related, but they haven’t helped me get things going:
 https://www.mail-archive.com/yocto@yoctoproject.org/msg18232.html
 https://www.yoctoproject.org/pipermail/yocto/2014-July/020547.html

Any pointers on where to look would be appreciated.

--

Chris Tapp
opensource@keylevel.com
www.keylevel.com

Re: [yocto] Enabling tk for Python tkinter module

[Tim Orling]

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On Tue, Sep 28, 2021 at 2:58 PM Chris Tapp <opensource@keylevel.com> wrote:

> I am trying to get PySimpleGUI running on an RPi4 using meta-raspberrypi
> with hardknott.
>
> I have created a recipe for PySimpleGUI and added the following to my
> local.conf:
>
> PACKAGECONFIG_pn-python3 = “tk”
> IMAGE_INSTALL_append = " python3 python3-modules python3-pysimplegui tk"
>
> However, the tkinter module fails to load, reporting “No module named
> _tkinter”, with a note above saying that Python may not be configured for
> Tk.
>
> Looking on the target, /usr/lib/libtk.8.so is present.
>
> It looks as if there is something else I need to do to get Python to build
> correctly, but I’m out of ideas ;-)
>

You need to add “tk” to the package config for python3
http://git.yoctoproject.org/cgit/cgit.cgi/poky/tree/meta/recipes-devtools/python/python3_3.9.6.bb#n110

Add the following to your distro|site|local.conf (or a python3_%.bbappend)

PACKAGECONFIG:append:pn-python3 = “ tk”

( replace : with _ if you are on old release that doesn’t support the new
override syntax)

(This assumes you have meta-oe in your bblayers.conf so you can build tk,
which it sounds like you do)

This is because the _tkinter .so built by python3 is dynamically loaded
only if present
http://git.yoctoproject.org/cgit/cgit.cgi/poky/tree/meta/recipes-devtools/python/python3/python3-manifest.json#n1161

—Tim “moto-timo” Orling


> I’ve found a few bits on the internet that seem related, but they haven’t
> helped me get things going:
>  https://www.mail-archive.com/yocto@yoctoproject.org/msg18232.html
>  https://www.yoctoproject.org/pipermail/yocto/2014-July/020547.html
>
> Any pointers on where to look would be appreciated.
>
> --
>
> Chris Tapp
> opensource@keylevel.com
> www.keylevel.com
>
>
> -=-=-=-=-=-=-=-=-=-=-=-
> Links: You receive all messages sent to this group.
> View/Reply Online (#54893):
> https://lists.yoctoproject.org/g/yocto/message/54893
> Mute This Topic: https://lists.yoctoproject.org/mt/85935979/924729
> Group Owner: yocto+owner@lists.yoctoproject.org
> Unsubscribe: https://lists.yoctoproject.org/g/yocto/unsub [
> ticotimo@gmail.com]
> -=-=-=-=-=-=-=-=-=-=-=-
>
>

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Re: [yocto] Enabling tk for Python tkinter module

[Chris Tapp]

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Hi Tim,

Thanks, that’s got it going. I was close, but didn’t quite cast the correct spell ;-)

Next is to work out why the display is black when I create a window...

--

Chris Tapp
opensource@keylevel.com
www.keylevel.com

----
You can tell you're getting older when your car insurance gets real cheap!

> On 29 Sep 2021, at 02:21, Tim Orling <ticotimo@gmail.com> wrote:
> 
> 
> 
> On Tue, Sep 28, 2021 at 2:58 PM Chris Tapp <opensource@keylevel.com <mailto:opensource@keylevel.com>> wrote:
> I am trying to get PySimpleGUI running on an RPi4 using meta-raspberrypi with hardknott.
> 
> I have created a recipe for PySimpleGUI and added the following to my local.conf:
> 
> PACKAGECONFIG_pn-python3 = “tk”
> IMAGE_INSTALL_append = " python3 python3-modules python3-pysimplegui tk"
> 
> However, the tkinter module fails to load, reporting “No module named _tkinter”, with a note above saying that Python may not be configured for Tk.
> 
> Looking on the target, /usr/lib/libtk.8.so <http://libtk.8.so/> is present.
> 
> It looks as if there is something else I need to do to get Python to build correctly, but I’m out of ideas ;-)
> 
> You need to add “tk” to the package config for python3
> http://git.yoctoproject.org/cgit/cgit.cgi/poky/tree/meta/recipes-devtools/python/python3_3.9.6.bb#n110 <http://git.yoctoproject.org/cgit/cgit.cgi/poky/tree/meta/recipes-devtools/python/python3_3.9.6.bb#n110>
> 
> Add the following to your distro|site|local.conf (or a python3_%.bbappend)
> 
> PACKAGECONFIG:append:pn-python3 = “ tk”
> 
> ( replace : with _ if you are on old release that doesn’t support the new override syntax)
> 
> (This assumes you have meta-oe in your bblayers.conf so you can build tk, which it sounds like you do)
> 
> This is because the _tkinter .so built by python3 is dynamically loaded only if present 
> http://git.yoctoproject.org/cgit/cgit.cgi/poky/tree/meta/recipes-devtools/python/python3/python3-manifest.json#n1161 <http://git.yoctoproject.org/cgit/cgit.cgi/poky/tree/meta/recipes-devtools/python/python3/python3-manifest.json#n1161>
> —Tim “moto-timo” Orling
> 
> 
> I’ve found a few bits on the internet that seem related, but they haven’t helped me get things going:
>  https://www.mail-archive.com/yocto@yoctoproject.org/msg18232.html <https://www.mail-archive.com/yocto@yoctoproject.org/msg18232.html>
>  https://www.yoctoproject.org/pipermail/yocto/2014-July/020547.html <https://www.yoctoproject.org/pipermail/yocto/2014-July/020547.html>
> 
> Any pointers on where to look would be appreciated.
> 
> --
> 
> Chris Tapp
> opensource@keylevel.com <mailto:opensource@keylevel.com>
> www.keylevel.com <http://www.keylevel.com/>
> 
> 
> 
> 
> 
> -=-=-=-=-=-=-=-=-=-=-=-
> Links: You receive all messages sent to this group.
> View/Reply Online (#54900): https://lists.yoctoproject.org/g/yocto/message/54900 <https://lists.yoctoproject.org/g/yocto/message/54900>
> Mute This Topic: https://lists.yoctoproject.org/mt/85935979/3617534 <https://lists.yoctoproject.org/mt/85935979/3617534>
> Group Owner: yocto+owner@lists.yoctoproject.org <mailto:yocto+owner@lists.yoctoproject.org>
> Unsubscribe: https://lists.yoctoproject.org/g/yocto/unsub <https://lists.yoctoproject.org/g/yocto/unsub> [opensource@keylevel.com <mailto:opensource@keylevel.com>]
> -=-=-=-=-=-=-=-=-=-=-=-


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