Re: [matplotlib-devel] Error when matplotlib.use'ing 'Cairo'

On 11/11/2010 11:28 AM, Kynn Jones wrote:
> Same thing:
>
>  >>> import cairo
>  >>> print cairo.version
> Traceback (most recent call last):
>    File "<stdin>", line 1, in <module>
> AttributeError: 'module' object has no attribute 'version'

It looks like you have a strangely broken pycairo installation, then.

Eric

>
> kj
>
>
> On Thu, Nov 11, 2010 at 3:09 PM, Eric Firing <ef...@ha...
> <mailto:ef...@ha...>> wrote:
>
>     On 11/11/2010 09:54 AM, Kynn Jones wrote:
>      > On my system, the following 3-line script
>      >
>      > *import matplotlib
>      > matplotlib.use('Cairo')
>      > import matplotlib.pyplot as plt
>      > *
>      > fails with the error:
>      >
>      > * File "<path-to-mpl-egg>/matplotlib/backends/backend_cairo.py", line
>      > 34, in <module>
>      >     if cairo.version_info < _version_required:
>      > AttributeError: 'module' object has no attribute 'version_info'
>      > *
>      > It's easy to see that the bug is in
>     matplotlib.backends.backend_cairo;
>      > here's the part of the code that produces the error:
>      >
>      > *try:
>      >    import cairo
>      > except ImportError:
>      >    raise ImportError("Cairo backend requires that pycairo is
>     installed.")
>      >
>      > _version_required = (1,2,0)
>      > if cairo.version_info < _version_required:
>      >    raise ImportError ("Pycairo %d.%d.%d is installed\n"
>      > "Pycairo %d.%d.%d or later is required"
>      >                      % (cairo.version_info + _version_required))
>      > *
>      > Indeed, the cairo module has no version_info attribute:
>      >
>      > *% python
>      > Python 2.6.1 (r261:67515, Feb 11 2010, 00:51:29)
>      > [GCC 4.2.1 (Apple Inc. build 5646)] on darwin
>      >> >> import cairo
>      >> >> cairo.version_info
>      > Traceback (most recent call last):
>      >   File "<stdin>", line 1, in <module>
>      > AttributeError: 'module' object has no attribute 'version_info'
>      > *
>
>     Strange.  Looking at the source of 1.8.10 from the py2cairo git repo, I
>     see version_info as well as version being included in the module via
>     cairomodule.c.
>
>      > (FWIW, the version of pycairo I have installed is 1.8.10 .)
>
>     What happens if you do:
>
>     import cairo
>     print cairo.version
>
>
>     Eric
>
>      >
>      > So matplotlib.backends.backend_cairo needs some other way to
>     determine
>      > the version number for the cairo module, but I don't understand this
>      > module sufficiently well to provide a patch for this bug.
>      >
>      > ~kj
>      >
>