bug#20889: python Tkinter

bug#20889: python Tkinter

[Federico Beffa]

The python package does not provide Tkinter which is part of the
Python Standard Library
https://docs.python.org/3/library/tkinter.html?highlight=tkinter#module-tkinter

bug#20889: python Tkinter

[Cyril Roelandt]

On 06/24/2015 09:14 AM, Federico Beffa wrote:
> The python package does not provide Tkinter which is part of the
> Python Standard Library
> https://docs.python.org/3/library/tkinter.html?highlight=tkinter#module-tkinter
> 

I think we need to add tcl and tk to the inputs, and add the
corresponding "-I" and "-L" flags to the configure flags. The issue is
that tk depends on Python (through libx11, which depends on libxcb,
which depends on Python), so we end up with a circular dependency
leading to what I reported in
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=20967 .

I think we should:
- rename the Python package to "python-without-tkinter" or
"python-minimal" and use that as a dependency in xorg.scm;
- define a "python" package that would inherit the "minimal Python"
package and add the dependency on tcl/tk to it.


WDYT ?

bug#20889: python Tkinter

[Ludovic Courtès]

Cyril Roelandt <tipecaml@gmail.com> skribis:

> On 06/24/2015 09:14 AM, Federico Beffa wrote:
>> The python package does not provide Tkinter which is part of the
>> Python Standard Library
>> https://docs.python.org/3/library/tkinter.html?highlight=tkinter#module-tkinter
>> 
>
> I think we need to add tcl and tk to the inputs, and add the
> corresponding "-I" and "-L" flags to the configure flags. The issue is
> that tk depends on Python (through libx11, which depends on libxcb,
> which depends on Python), so we end up with a circular dependency
> leading to what I reported in
> http://debbugs.gnu.org/cgi/bugreport.cgi?bug=20967 .
>
> I think we should:
> - rename the Python package to "python-without-tkinter" or
> "python-minimal" and use that as a dependency in xorg.scm;
> - define a "python" package that would inherit the "minimal Python"
> package and add the dependency on tcl/tk to it.

How frequently do Python packages rely on the availability of Tkinter?

I’m asking because it might be that we could keep the default Python
without Tk, and only use the Tk-enabled Python for the few packages that
need it, if it’s rare enough.

WDYT?

Ludo’.

bug#20889: python Tkinter

[Cyril Roelandt]

On 07/05/2015 12:16 PM, Ludovic Courtès wrote:
> I’m asking because it might be that we could keep the default Python
> without Tk, and only use the Tk-enabled Python for the few packages that
> need it, if it’s rare enough.

No, we do not want that. Users who install Python expect to be able to
import tkinter, since it is part of the standard library.

Cyril.

bug#20889: python Tkinter

[Federico Beffa]

On Mon, Jul 6, 2015 at 12:39 AM, Cyril Roelandt <tipecaml@gmail.com> wrote:
> On 07/05/2015 12:16 PM, Ludovic Courtès wrote:
>> I’m asking because it might be that we could keep the default Python
>> without Tk, and only use the Tk-enabled Python for the few packages that
>> need it, if it’s rare enough.
>
> No, we do not want that. Users who install Python expect to be able to
> import tkinter, since it is part of the standard library.

I agree with Cyril.

bug#20889: python Tkinter

[Ludovic Courtès]

Federico Beffa <beffa@ieee.org> skribis:

> On Mon, Jul 6, 2015 at 12:39 AM, Cyril Roelandt <tipecaml@gmail.com> wrote:
>> On 07/05/2015 12:16 PM, Ludovic Courtès wrote:
>>> I’m asking because it might be that we could keep the default Python
>>> without Tk, and only use the Tk-enabled Python for the few packages that
>>> need it, if it’s rare enough.
>>
>> No, we do not want that. Users who install Python expect to be able to
>> import tkinter, since it is part of the standard library.
>
> I agree with Cyril.

OK.  Then we effectively need to proceed as you suggest: Build
python-minimal (which does not depend on Tk), build Tk, and then build
python.

But we should make sure that python-minimal is not retained, if
possible.

Ludo’.

bug#20889: python Tkinter

[Andreas Enge]

On Mon, Jul 06, 2015 at 12:21:11PM +0200, Ludovic Courtès wrote:
> OK.  Then we effectively need to proceed as you suggest: Build
> python-minimal (which does not depend on Tk), build Tk, and then build
> python.

And maybe this python-minimal could be smaller than the current python,
in the sense of "minimal"?

Andreas

bug#20889: python Tkinter

[Ludovic Courtès]

ludo@gnu.org (Ludovic Courtès) skribis:

> OK.  Then we effectively need to proceed as you suggest: Build
> python-minimal (which does not depend on Tk), build Tk, and then build
> python.

Done in commits 95288fc and afa181f.

Thanks,
Ludo’.

bug#20889: python Tkinter

[Ludovic Courtès]

ludo@gnu.org (Ludovic Courtès) skribis:

> OK.  Then we effectively need to proceed as you suggest: Build
> python-minimal (which does not depend on Tk), build Tk, and then build
> python.

Done in commits 95288fc and afa181f.

Thanks,
Ludo’.

bug#20889: python Tkinter

[Federico Beffa]

If I start python3 and do:

-------------------------------------------------------
$ python3
Python 3.4.3 (default, Oct  9 2015, 22:53:58)
[GCC 4.9.3] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import tkinter
>>> root = tkinter.Tk()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/gnu/store/y5x6c38fzrbfl80jxrgjd6py2k88x12a-python-3.4.3/lib/python3.4/tkinter/__init__.py",
line 1851, in __init__
    self.tk = _tkinter.create(screenName, baseName, className,
interactive, wantobjects, useTk, sync, use)
_tkinter.TclError: Can't find a usable tk.tcl in the following directories:
    /gnu/store/sd4fcdk9yzh1s0230fjx1yfwk9pl71bf-tcl-8.6.4/lib/tcl8.6/tk8.6
/gnu/store/sd4fcdk9yzh1s0230fjx1yfwk9pl71bf-tcl-8.6.4/lib/tk8.6
/gnu/store/y5x6c38fzrbfl80jxrgjd6py2k88x12a-python-3.4.3/lib/tk8.6
/gnu/store/lib/tk8.6
/gnu/store/y5x6c38fzrbfl80jxrgjd6py2k88x12a-python-3.4.3/library



This probably means that tk wasn't installed properly.
-------------------------------------------------------

Did you successfully test it?

Regards,
Fede

bug#20889: python Tkinter

[Ludovic Courtès]

Federico Beffa <beffa@ieee.org> skribis:

> >>> root = tkinter.Tk()
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/gnu/store/y5x6c38fzrbfl80jxrgjd6py2k88x12a-python-3.4.3/lib/python3.4/tkinter/__init__.py",
> line 1851, in __init__
>     self.tk = _tkinter.create(screenName, baseName, className,
> interactive, wantobjects, useTk, sync, use)
> _tkinter.TclError: Can't find a usable tk.tcl in the following directories:
>     /gnu/store/sd4fcdk9yzh1s0230fjx1yfwk9pl71bf-tcl-8.6.4/lib/tcl8.6/tk8.6
> /gnu/store/sd4fcdk9yzh1s0230fjx1yfwk9pl71bf-tcl-8.6.4/lib/tk8.6
> /gnu/store/y5x6c38fzrbfl80jxrgjd6py2k88x12a-python-3.4.3/lib/tk8.6
> /gnu/store/lib/tk8.6
> /gnu/store/y5x6c38fzrbfl80jxrgjd6py2k88x12a-python-3.4.3/library

This error message comes from Tcl, in file ‘auto.tcl’, procedure
‘tcl_findLibrary’.

We’d need to find where the call comes from and hard-code a search path
in there maybe?

> Did you successfully test it?

I just did “import tkinter.”

> with:
>
> $TCLLIBPATH=/gnu/store/c4rpx4050d0qkccwbzggabag403b31l3-tk-8.6.4/lib python3
>
> it works. So I guess that 'tcl' needs a search-path-specification.

Yes.  That wouldn’t help for Python though, where we need to hard-code
the search path somehow.

> ... and the configure script for Python defines the flag
> '--with-tcltk-libs'. Maybe that would help...

I don’t think it would help because Python finds Tcl and Tk anyway.

Thanks,
Ludo’.

bug#20889: python Tkinter

[Federico Beffa]

with:

$TCLLIBPATH=/gnu/store/c4rpx4050d0qkccwbzggabag403b31l3-tk-8.6.4/lib python3

it works. So I guess that 'tcl' needs a search-path-specification.

Regards,
Fede

bug#20889: python Tkinter

[Federico Beffa]

... and the configure script for Python defines the flag
'--with-tcltk-libs'. Maybe that would help...

Regards,
Fede

bug#20889: Tkinter moved to separate output

[Federico Beffa]

[-- Attachment #1: Type: text/plain, Size: 422 bytes --]

Federico Beffa <beffa@ieee.org> writes:

> On Sun, Nov 29, 2015 at 11:09 PM, Ludovic Courtès <ludo@gnu.org> wrote:
>> Federico Beffa <beffa@ieee.org> skribis:

> Looking into the failed build directory, it seems that PKG_CONFIG_PATH
> is set correctly. Still, it doesn't get the correct flags.

The attached patch fixes the problem and I can now plot with TkAgg :-)

Thanks for making Tkinter available!
Fede

[-- Attachment #2: 0001-gnu-python-matplotlib-Add-TkAgg-backend-and-update-t.patch --]
[-- Type: text/x-diff, Size: 4427 bytes --]

From b40cf5522bcc15166ca07dfbae50167203d29e2d Mon Sep 17 00:00:00 2001
From: Federico Beffa <beffa@fbengineering.ch>
Date: Tue, 1 Dec 2015 17:20:59 +0100
Subject: [PATCH 1/2] gnu: python-matplotlib: Add 'TkAgg' backend and update to
 version '1.4.3'.

* gnu/packages/python.scm (python-matplotlib): Do it.
* gnu/packages/patches/matplotlib-setupext-tk.patch: New file.
---
 gnu/packages/patches/matplotlib-setupext-tk.patch | 30 +++++++++++++++++++++++
 gnu/packages/python.scm                           | 17 +++++++++----
 2 files changed, 42 insertions(+), 5 deletions(-)
 create mode 100644 gnu/packages/patches/matplotlib-setupext-tk.patch

diff --git a/gnu/packages/patches/matplotlib-setupext-tk.patch b/gnu/packages/patches/matplotlib-setupext-tk.patch
new file mode 100644
index 0000000..cd0332e
--- /dev/null
+++ b/gnu/packages/patches/matplotlib-setupext-tk.patch
@@ -0,0 +1,30 @@
+Use 'pkg-config' instead of heuristics to find 'tk' flags.
+
+--- matplotlib-1.4.3/setupext.py.orig	2015-12-01 14:21:19.554417453 +0100
++++ matplotlib-1.4.3/setupext.py	2015-12-01 14:35:51.999928797 +0100
+@@ -1457,7 +1457,7 @@
+             p = subprocess.Popen(
+                 '. %s ; eval echo ${%s}' % (file, varname),
+                 shell=True,
+-                executable="/bin/sh",
++                executable="sh",
+                 stdout=subprocess.PIPE)
+             result = p.communicate()[0]
+             return result.decode('ascii')
+@@ -1601,8 +1601,15 @@
+             #      of distros.
+ 
+             # Query Tcl/Tk system for library paths and version string
++            def getoutput(s):
++                ret = os.popen(s).read().strip()
++                return ret
+             try:
+-                tcl_lib_dir, tk_lib_dir, tk_ver = self.query_tcltk()
++                #tcl_lib_dir, tk_lib_dir, tk_ver = self.query_tcltk()
++                pkg_config_res = getoutput('pkg-config --libs tk').split()
++                tk_ver = pkg_config_res[-1][-3:]
++                tcl_lib_dir = pkg_config_res[0][2:] + '/tcl' + tk_ver
++                tk_lib_dir = pkg_config_res[1][2:] + '/tk' + tk_ver
+             except:
+                 tk_ver = ''
+                 result = self.hardcoded_tcl_config()
diff --git a/gnu/packages/python.scm b/gnu/packages/python.scm
index 39d0751..5e23bab 100644
--- a/gnu/packages/python.scm
+++ b/gnu/packages/python.scm
@@ -3175,7 +3175,7 @@ transcendental functions).")
 (define-public python-matplotlib
   (package
     (name "python-matplotlib")
-    (version "1.4.2")
+    (version "1.4.3")
     (source
      (origin
        (method url-fetch)
@@ -3183,13 +3183,15 @@ transcendental functions).")
                            "/matplotlib-" version ".tar.gz"))
        (sha256
         (base32
-         "0m6v9nwdldlwk22gcd339zg6mny5m301fxgks7z8sb8m9wawg8qp"))))
+         "1dn05cvd0g984lzhh72wa0z93psgwshbbg93fkab6slx5m3l95av"))
+       (patches (list (search-patch "matplotlib-setupext-tk.patch")))))
     (build-system python-build-system)
     (outputs '("out" "doc"))
     (propagated-inputs ; the following packages are all needed at run time
      `(("python-pyparsing" ,python-pyparsing)
        ("python-pygobject" ,python-pygobject)
        ("gobject-introspection" ,gobject-introspection)
+       ("python" ,python "tk")
        ;; The 'gtk+' package (and 'gdk-pixbuf', 'atk' and 'pango' propagated
        ;; from 'gtk+') provides the required 'typelib' files used by
        ;; 'gobject-introspection'. The location of these files is set with the
@@ -3224,7 +3226,8 @@ transcendental functions).")
        ;; FIXME: Add backends when available.
        ;("python-wxpython" ,python-wxpython)
        ;("python-pyqt" ,python-pyqt)
-       ))
+       ("tcl" ,tcl)
+       ("tk" ,tk)))
     (native-inputs
      `(("pkg-config" ,pkg-config)
        ("texlive" ,texlive)
@@ -3243,8 +3246,12 @@ transcendental functions).")
             (setenv "HOME" (getcwd))
             (call-with-output-file "setup.cfg"
               (lambda (port)
-                (format port "[rc_options]~%
-backend = GTK3Agg~%")))))
+                (format port "[directories]~%
+basedirlist = ~a,~a~%
+[rc_options]~%
+backend = TkAgg~%"
+                        (assoc-ref inputs "tcl")
+                        (assoc-ref inputs "tk"))))))
         (alist-cons-after
          'install 'install-doc
          (lambda* (#:key outputs #:allow-other-keys)
-- 
2.4.3

bug#20889: Tkinter moved to separate output

[Ludovic Courtès]

In ‘tk-update’ the ‘python’ packages now have a separate ‘tk’ output for
Tkinter (adding ~50 MiB to the closure of Python.)  I’ve tested it along
these lines, for 2.x and 3.x:

  guix environment --ad-hoc python python:tk --pure -- python
  > import Tkinter
  > root = Tkinter.Tk()
  
One thing I haven’t checked is whether some packages need to have an
additional python:tk input.  Matplotlib maybe?  Federico?

I plan to have Hydra build that branch once we’ve checked that.

Thanks,
Ludo’.

bug#20889: Tkinter moved to separate output

[Federico Beffa]

On Mon, Nov 16, 2015 at 9:42 AM, Ludovic Courtès <ludo@gnu.org> wrote:
> In ‘tk-update’ the ‘python’ packages now have a separate ‘tk’ output for
> Tkinter (adding ~50 MiB to the closure of Python.)  I’ve tested it along
> these lines, for 2.x and 3.x:
>
>   guix environment --ad-hoc python python:tk --pure -- python
>   > import Tkinter
>   > root = Tkinter.Tk()
>
> One thing I haven’t checked is whether some packages need to have an
> additional python:tk input.  Matplotlib maybe?  Federico?

Yes, given that the back-end currently used by matploblib doesn't
work, I would change that by using 'Tkinter'.

Since you are at it, I would also change the default back-end by
changing 'GTK3Agg' to 'TkAgg' in the following snippet:

(lambda (port)
  (format port "[rc_options]~%
backend = GTK3Agg~%")))))

I'm not convinced that having 2 versions of packages (a "normal" and a
"minimal" one) is a good idea. The reason is that you often end up
downloading both instead of just one. As one example, I just
downloaded 'vlc' and I noticed that it downloaded both 'cups' and
'cups-minimal'. Similarly, for python, anyone needing 'Tkinter' will
end up with 2 versions in the store.

Regards,
Fede

bug#20889: Tkinter moved to separate output

[Ludovic Courtès]

Federico Beffa <beffa@ieee.org> skribis:

> On Mon, Nov 16, 2015 at 9:42 AM, Ludovic Courtès <ludo@gnu.org> wrote:
>> In ‘tk-update’ the ‘python’ packages now have a separate ‘tk’ output for
>> Tkinter (adding ~50 MiB to the closure of Python.)  I’ve tested it along
>> these lines, for 2.x and 3.x:
>>
>>   guix environment --ad-hoc python python:tk --pure -- python
>>   > import Tkinter
>>   > root = Tkinter.Tk()
>>
>> One thing I haven’t checked is whether some packages need to have an
>> additional python:tk input.  Matplotlib maybe?  Federico?
>
> Yes, given that the back-end currently used by matploblib doesn't
> work, I would change that by using 'Tkinter'.
>
> Since you are at it, I would also change the default back-end by
> changing 'GTK3Agg' to 'TkAgg' in the following snippet:
>
> (lambda (port)
>   (format port "[rc_options]~%
> backend = GTK3Agg~%")))))

OTOH I see that Matploblib already depends on GTK+ 3.x and
python-pygobject, so maybe it’s best to stick to GTK+ by default?

> I'm not convinced that having 2 versions of packages (a "normal" and a
> "minimal" one) is a good idea. The reason is that you often end up
> downloading both instead of just one. As one example, I just
> downloaded 'vlc' and I noticed that it downloaded both 'cups' and
> 'cups-minimal'. Similarly, for python, anyone needing 'Tkinter' will
> end up with 2 versions in the store.

The ‘minimal’ variants are there to break cyclic dependencies most of
the time.  This is the case for cups/cups-filters and Python/Tk.

At run time, cups indeed depends on cups-filters, which depends on
cups-minimal.  In that case, as you say, we end up downloading those two
variants.  But there’s not much of a choice, as was discussed during the
initial review:

  https://lists.gnu.org/archive/html/guix-devel/2015-01/msg00057.html

Conversely, python does not depend on python-minimal.  So python-minimal
is here just to break the cycle with Tk/libxcb, as noted in python.scm
and discussed in:

  http://debbugs.gnu.org/cgi/bugreport.cgi?bug=20889

As for Tkinter, it is in a separate “tk” output, which users can choose
to install or not.  The “tk” output contains a single file, but it pulls
in Tcl/Tk.

I hope this clarifies things.

Thanks for your feedback,
Ludo’.

bug#20889: Tkinter moved to separate output

[Federico Beffa]

On Mon, Nov 16, 2015 at 1:57 PM, Ludovic Courtès <ludo@gnu.org> wrote:
> Federico Beffa <beffa@ieee.org> skribis:
>> Yes, given that the back-end currently used by matploblib doesn't
>> work, I would change that by using 'Tkinter'.
>>
>> Since you are at it, I would also change the default back-end by
>> changing 'GTK3Agg' to 'TkAgg' in the following snippet:
>>
>> (lambda (port)
>>   (format port "[rc_options]~%
>> backend = GTK3Agg~%")))))
>
> OTOH I see that Matploblib already depends on GTK+ 3.x and
> python-pygobject, so maybe it’s best to stick to GTK+ by default?

Unfortunately, the back-ends based on GTK+ are broken and I didn't
manage to find how to fix the problem.
http://debbugs.gnu.org/cgi/bugreport.cgi?bug=20888

That's why I'm looking forward to get Tkinter :-)

>> I'm not convinced that having 2 versions of packages (a "normal" and a
>> "minimal" one) is a good idea. The reason is that you often end up
>> downloading both instead of just one. As one example, I just
>> downloaded 'vlc' and I noticed that it downloaded both 'cups' and
>> 'cups-minimal'. Similarly, for python, anyone needing 'Tkinter' will
>> end up with 2 versions in the store.
>
> The ‘minimal’ variants are there to break cyclic dependencies most of
> the time.  This is the case for cups/cups-filters and Python/Tk.
>
> At run time, cups indeed depends on cups-filters, which depends on
> cups-minimal.  In that case, as you say, we end up downloading those two
> variants.  But there’s not much of a choice, as was discussed during the
> initial review:
>
>   https://lists.gnu.org/archive/html/guix-devel/2015-01/msg00057.html
>
> Conversely, python does not depend on python-minimal.  So python-minimal
> is here just to break the cycle with Tk/libxcb, as noted in python.scm
> and discussed in:
>
>   http://debbugs.gnu.org/cgi/bugreport.cgi?bug=20889
>
> As for Tkinter, it is in a separate “tk” output, which users can choose
> to install or not.  The “tk” output contains a single file, but it pulls
> in Tcl/Tk.

OK. Thanks for the explanation!

Regards,
Fede

bug#20889: Tkinter moved to separate output

[Ludovic Courtès]

[-- Attachment #1: Type: text/plain, Size: 978 bytes --]

Federico Beffa <beffa@ieee.org> skribis:

> On Mon, Nov 16, 2015 at 1:57 PM, Ludovic Courtès <ludo@gnu.org> wrote:
>> Federico Beffa <beffa@ieee.org> skribis:
>>> Yes, given that the back-end currently used by matploblib doesn't
>>> work, I would change that by using 'Tkinter'.
>>>
>>> Since you are at it, I would also change the default back-end by
>>> changing 'GTK3Agg' to 'TkAgg' in the following snippet:
>>>
>>> (lambda (port)
>>>   (format port "[rc_options]~%
>>> backend = GTK3Agg~%")))))
>>
>> OTOH I see that Matploblib already depends on GTK+ 3.x and
>> python-pygobject, so maybe it’s best to stick to GTK+ by default?
>
> Unfortunately, the back-ends based on GTK+ are broken and I didn't
> manage to find how to fix the problem.
> http://debbugs.gnu.org/cgi/bugreport.cgi?bug=20888
>
> That's why I'm looking forward to get Tkinter :-)

Could you or someone else test this patch on current master?

Thanks in advance!

Ludo’.


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diff --git a/gnu/packages/python.scm b/gnu/packages/python.scm
index 39d0751..76bda96 100644
--- a/gnu/packages/python.scm
+++ b/gnu/packages/python.scm
@@ -3190,6 +3190,7 @@ transcendental functions).")
      `(("python-pyparsing" ,python-pyparsing)
        ("python-pygobject" ,python-pygobject)
        ("gobject-introspection" ,gobject-introspection)
+       ("python-tkinter" ,python "tk")
        ;; The 'gtk+' package (and 'gdk-pixbuf', 'atk' and 'pango' propagated
        ;; from 'gtk+') provides the required 'typelib' files used by
        ;; 'gobject-introspection'. The location of these files is set with the
@@ -3244,7 +3245,7 @@ transcendental functions).")
             (call-with-output-file "setup.cfg"
               (lambda (port)
                 (format port "[rc_options]~%
-backend = GTK3Agg~%")))))
+backend = TkAgg~%")))))
         (alist-cons-after
          'install 'install-doc
          (lambda* (#:key outputs #:allow-other-keys)

bug#20889: Tkinter moved to separate output

[Federico Beffa]

[-- Attachment #1: Type: text/plain, Size: 2994 bytes --]

On Sun, Nov 29, 2015 at 11:09 PM, Ludovic Courtès <ludo@gnu.org> wrote:
> Federico Beffa <beffa@ieee.org> skribis:
>
>> On Mon, Nov 16, 2015 at 1:57 PM, Ludovic Courtès <ludo@gnu.org> wrote:
>>> Federico Beffa <beffa@ieee.org> skribis:
>>>> Yes, given that the back-end currently used by matploblib doesn't
>>>> work, I would change that by using 'Tkinter'.
>>>>
>>>> Since you are at it, I would also change the default back-end by
>>>> changing 'GTK3Agg' to 'TkAgg' in the following snippet:
>>>>
>>>> (lambda (port)
>>>>   (format port "[rc_options]~%
>>>> backend = GTK3Agg~%")))))
>>>
>>> OTOH I see that Matploblib already depends on GTK+ 3.x and
>>> python-pygobject, so maybe it’s best to stick to GTK+ by default?
>>
>> Unfortunately, the back-ends based on GTK+ are broken and I didn't
>> manage to find how to fix the problem.
>> http://debbugs.gnu.org/cgi/bugreport.cgi?bug=20888
>>
>> That's why I'm looking forward to get Tkinter :-)
>
> Could you or someone else test this patch on current master?

It does not work. It can't find the tcl/tk header files:

...
                 tkagg: no  [The C/C++ header for Tk (tk.h) could not be
                        found.  You may need to install the development
                        package.]
...

With the attached patch it does find the headers, but then it fails at
link time.

...
g++ -pthread -shared
-Wl,-rpath=/gnu/store/cxrqlhbr6xqgi08x3amd0lvl6m7sxx57-python-3.4.3/lib
build/temp.linux-x86_64-3.4/src/agg_py_transforms.o
build/temp.linux-x86_64-3.4/src/_tkagg.o
build/temp.linux-x86_64-3.4/extern/agg24/src/agg_bezier_arc.o
build/temp.linux-x86_64-3.4/extern/agg24/src/agg_curves.o
build/temp.linux-x86_64-3.4/extern/agg24/src/agg_image_filters.o
build/temp.linux-x86_64-3.4/extern/agg24/src/agg_trans_affine.o
build/temp.linux-x86_64-3.4/extern/agg24/src/agg_vcgen_contour.o
build/temp.linux-x86_64-3.4/extern/agg24/src/agg_vcgen_dash.o
build/temp.linux-x86_64-3.4/extern/agg24/src/agg_vcgen_stroke.o
build/temp.linux-x86_64-3.4/extern/agg24/src/agg_vpgen_segmentator.o
build/temp.linux-x86_64-3.4/extern/CXX/IndirectPythonInterface.o
build/temp.linux-x86_64-3.4/extern/CXX/cxxsupport.o
build/temp.linux-x86_64-3.4/extern/CXX/cxx_extensions.o
build/temp.linux-x86_64-3.4/extern/CXX/cxxextensions.o
-L/gnu/store/ipsq9hlk6k0w1qfiw0y0a03bxkp2clhl-tcl-8.6.4/lib
-L/gnu/store/my9wgryzpfvksng6k7h87xz9rphdwddw-tk-8.6.4/lib
-L/usr/local/lib -L/usr/local/lib
-L/gnu/store/cxrqlhbr6xqgi08x3amd0lvl6m7sxx57-python-3.4.3/lib -ltcl
-ltk -lstdc++ -lm -lpython3.4m -o
build/lib.linux-x86_64-3.4/matplotlib/backends/_tkagg.cpython-34m.so
ld: cannot find -ltcl
ld: cannot find -ltk
collect2: error: ld returned 1 exit status
error: command 'g++' failed with exit status 1
phase `build' failed after 94.8 seconds
...

Looking into the failed build directory, it seems that PKG_CONFIG_PATH
is set correctly. Still, it doesn't get the correct flags.

Regards,
Fede

[-- Attachment #2: mpl.patch --]
[-- Type: text/x-diff, Size: 1510 bytes --]

diff --git a/gnu/packages/python.scm b/gnu/packages/python.scm
index 39d0751..4dfe557 100644
--- a/gnu/packages/python.scm
+++ b/gnu/packages/python.scm
@@ -3190,6 +3190,7 @@ transcendental functions).")
      `(("python-pyparsing" ,python-pyparsing)
        ("python-pygobject" ,python-pygobject)
        ("gobject-introspection" ,gobject-introspection)
+       ("python-tkinter" ,python "tk")
        ;; The 'gtk+' package (and 'gdk-pixbuf', 'atk' and 'pango' propagated
        ;; from 'gtk+') provides the required 'typelib' files used by
        ;; 'gobject-introspection'. The location of these files is set with the
@@ -3224,7 +3225,8 @@ transcendental functions).")
        ;; FIXME: Add backends when available.
        ;("python-wxpython" ,python-wxpython)
        ;("python-pyqt" ,python-pyqt)
-       ))
+       ("tcl" ,tcl)
+       ("tk" ,tk)))
     (native-inputs
      `(("pkg-config" ,pkg-config)
        ("texlive" ,texlive)
@@ -3243,8 +3245,13 @@ transcendental functions).")
             (setenv "HOME" (getcwd))
             (call-with-output-file "setup.cfg"
               (lambda (port)
-                (format port "[rc_options]~%
-backend = GTK3Agg~%")))))
+                (format port "[directories]~%
+basedirlist = ~a,~a~%
+~%
+[rc_options]~%
+backend = TkAgg~%"
+                        (assoc-ref inputs "tcl")
+                        (assoc-ref inputs "tk"))))))
         (alist-cons-after
          'install 'install-doc
          (lambda* (#:key outputs #:allow-other-keys)

bug#20889: Tkinter moved to separate output

[Ludovic Courtès]

Federico Beffa <beffa@ieee.org> skribis:

> The attached patch fixes the problem and I can now plot with TkAgg :-)
>
> Thanks for making Tkinter available!
> Fede
>
> From b40cf5522bcc15166ca07dfbae50167203d29e2d Mon Sep 17 00:00:00 2001
> From: Federico Beffa <beffa@fbengineering.ch>
> Date: Tue, 1 Dec 2015 17:20:59 +0100
> Subject: [PATCH 1/2] gnu: python-matplotlib: Add 'TkAgg' backend and update to
>  version '1.4.3'.
>
> * gnu/packages/python.scm (python-matplotlib): Do it.
> * gnu/packages/patches/matplotlib-setupext-tk.patch: New file.

Nice!

Please make sure to add the patch to gnu-system.am, but otherwise looks
great!

Thanks for fixing it!

I gather this addresses http://bugs.gnu.org/20888, right?

Ludo’.

bug#20889: Tkinter moved to separate output

[Federico Beffa]

On Tue, Dec 1, 2015 at 11:00 PM, Ludovic Courtès <ludo@gnu.org> wrote:
> I gather this addresses http://bugs.gnu.org/20888, right?

Well, it partially solves it:
Now there is a working backend suitable for interactive plotting which
is enabled by default. However, the 'GTK3Agg' backend is still there
and still not working. At some point it would be nice to have it
working as well.

Regards,
Fede