python-liblcms: python bindings defective

[Guy K. Kloss]

Binary package hint: python-liblcms

* installing liblcms1 and python-liblcms
* the module "lcms" from the python bindings to LittleCMS are available, but they do not seem to contain any bindings to the actual liblcms1 library
* try the following in the interactive python interpreter:

$ python
Python 2.5.1 (r251:54863, Oct 5 2007, 13:36:32)
[GCC 4.1.3 20070929 (prerelease) (Ubuntu 4.1.2-16ubuntu2)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import lcms
>>> foo = lcms.cmsCIEXYZ()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute 'cmsCIEXYZ'
>>>

Compilation of lcms-1.17 from the original sources (http://littlecms.com) using the configure flag --with-python yields proper bindings.

[Oleksandr Moskalenko (malex)]

$ python
Python 2.4.4 (#2, Aug 16 2007, 02:03:40)
[GCC 4.1.3 20070812 (prerelease) (Debian 4.1.2-15)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from lcms import lcms
>>> foo = lcms.cmsCIEXYZ()
>>> foo
XYZ [0, 0, 0]

Notice the way it's imported.

Regards,

Alex

(Debian liblcms maintainer)

[Oleksandr Moskalenko (malex)]

Not a bug as far as I can tell. The import is just different.

[Guy K. Kloss (guy.kloss)]

The import at least works on self compiled binaries "properly" (as in the usual way).

And shouldn't imports work homogeneously in the Python language environment. I believe that's one of the reasons why it is so popular.

[Guy K. Kloss (guy.kloss)]

Oleksandr Moskalenko (Debian lcms package maintainer) has just uploaded a package into Debian/unstable that has the expected "import lcms" behaviour. This will now have to make it into Ubuntu ...

[Olivier Berten (olivier-berten)]

With version 1.16-10 it doesn't import anything anymore...

Python 2.5.2 (r252:60911, Jun 28 2008, 14:35:19)
[GCC 4.3.1] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from lcms import *
>>> dir()
['__builtins__', '__doc__', '__name__']
>>> from lcms.lcms import *
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named lcms
>>> import lcms
>>> dir()
['__builtins__', '__doc__', '__name__', 'lcms']
>>> dir(lcms)
['__builtins__', '__doc__', '__file__', '__name__', '__path__']
>>>

[Oleksandr Moskalenko (malex)]

* Olivier Berten <email address hidden> [2008-07-04 18:21:31 -0000]:

> With version 1.16-10 it doesn't import anything anymore...

I just uploaded a new release 1.17-1 into Debian/unstable. "import lcms" works
fine there.

Cheers,

Alex.

> Python 2.5.2 (r252:60911, Jun 28 2008, 14:35:19)
> [GCC 4.3.1] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>> from lcms import *
> >>> dir()
> ['__builtins__', '__doc__', '__name__']
> >>> from lcms.lcms import *
> Traceback (most recent call last):
> File "<stdin>", line 1, in <module>
> ImportError: No module named lcms
> >>> import lcms
> >>> dir()
> ['__builtins__', '__doc__', '__name__', 'lcms']
> >>> dir(lcms)
> ['__builtins__', '__doc__', '__file__', '__name__', '__path__']
> >>>
>
> --
> python-liblcms: python bindings defective
> https://bugs.launchpad.net/bugs/178033
> You received this bug notification because you are a direct subscriber
> of the bug.
>

[pr100 (paul-rudin)]

import lcms works, but the module doesn't actually have anything in it.

[pr100 (paul-rudin)]

or actually, it does, but you have to do "from lcms import lcsm", where normally people would just expect "import lcms"

[Guy K. Kloss (guy.kloss)]

An easy fix that would be worth putting into the package distribution:

Just remove the two Python packages, as all that's needed is found in the module lcms.py anyway. The dualism in the name space (package and module of same name) overshadow each other and hinder a seamless working. So, these directories (for the Python packages) need to be removed, and everything should work:

 * /usr/share/python-support/python-liblcms/lcms
 * /var/lib/python-support/python2.5/lcms

Hope that helps,

Guy

[igor.e.novikov (igor-e-novikov)]

Hi all!

The bug is marked as affected on sK1. Actually we have resolved this issue. Official lcms python binding is a SWIG generated stubs. It's not a best solution for sK1. So we have created own lcms binding with improved performance and optimized code. Naturally our extension is compiled without any similar problems. Here is a source code which will be included in next release:

http://sk1.svn.sourceforge.net/viewvc/sk1/trunk/subprojects/pycms/

Therefore the bug is not important for sK1 project.

Regards,

Igor Novikov
sK1 Project
http://sk1project.org

[igor.e.novikov (igor-e-novikov)]

We have implemented own lcms binding optimized for vector graphics (located in sk1libs), so this issue has not affected on sK1.