[Community] Stumbling on Shapely

[Sean Gillies]

Hi Marc,

Shapely requires libgeos 2.2.3 or 3.0+. Previous versions have
incomplete C APIs and bugs that warrant an upgrade. The upcoming 3.0.3
release looks promising, though I don't know when it will start
appearing in distros.

Cheers,
Sean

Marc Pfister wrote:
> So I installed Shapely with easy_install but when I try:
> 
>  
> 
>>>> from shapely.geometry import Point
> 
>  
> 
> I'm getting "undefined symbol" errors. This is happening on two
> different computers so I'm not sure what I'm missing.
> 
>  
> 
> First server is Ubuntu 6.06 LTS, Python 2.4.3 with ctypes installed.
> Libgeos is installed with libgeos_c.so.1.3.3 and libgeos.so.2.1.4 (So it
> looks like I need to upgrade libgeos anyway). Here's the error I get:
> 
>  
> 
>>>> from shapely.geometry import Point
> 
> Traceback (most recent call last):
> 
>   File "<stdin>", line 1, in ?
> 
>   File
> "/usr/lib/python2.4/site-packages/Shapely-1.0.8-py2.4.egg/shapely/geomet
> ry/__init__.py",
> 
> line 1, in ?
> 
>     from geo import shape, asShape
> 
>   File
> "/usr/lib/python2.4/site-packages/Shapely-1.0.8-py2.4.egg/shapely/geomet
> ry/geo.py",
> 
> line 5, in ?
> 
>     from point import Point, asPoint
> 
>   File
> "/usr/lib/python2.4/site-packages/Shapely-1.0.8-py2.4.egg/shapely/geomet
> ry/point.py",
> 
> line 10, in ?
> 
>     from shapely.geos import lgeos, DimensionError
> 
>   File
> "/usr/lib/python2.4/site-packages/Shapely-1.0.8-py2.4.egg/shapely/geos.p
> y",
> 
> line 54, in ?
> 
>     execfile(os.path.join(_here, 'ctypes_declarations.py'))
> 
>   File
> "/usr/lib/python2.4/site-packages/Shapely-1.0.8-py2.4.egg/shapely/ctypes
> _declarations.py",
> 
> line 233, in ?
> 
>     lgeos.GEOSWKTReader_create.restype = ctypes.c_void_p
> 
>   File
> "/usr/lib/python2.4/site-packages/ctypes-1.0.2-py2.4-linux-x86_64.egg/ct
> ypes/__init__.py",
> 
> line 353, in __getattr__
> 
>     func = self.__getitem__(name)
> 
>   File
> "/usr/lib/python2.4/site-packages/ctypes-1.0.2-py2.4-linux-x86_64.egg/ct
> ypes/__init__.py",
> 
> line 358, in __getitem__
> 
>     func = self._FuncPtr((name_or_ordinal, self))
> 
> AttributeError: /usr/lib/libgeos_c.so.1: undefined symbol:
> GEOSWKTReader_create
> 
>  
> 
>  
> 
> However, I get a very similar error on my laptop, which is Ubuntu 8.04
> with Python 2.5.2 and libgeos.so.2.2.3, which should meet all of the
> dependencies:
> 
>  
> 
>>>> from shapely.geometry import Point
> 
> Traceback (most recent call last):
> 
>   File "<stdin>", line 1, in <module>
> 
>   File
> "/usr/lib/python2.5/site-packages/Shapely-1.0.8-py2.5.egg/shapely/geomet
> ry/__init__.py",
> 
> line 1, in <module>
> 
>     from geo import shape, asShape
> 
>   File
> "/usr/lib/python2.5/site-packages/Shapely-1.0.8-py2.5.egg/shapely/geomet
> ry/geo.py",
> 
> line 5, in <module>
> 
>     from point import Point, asPoint
> 
>   File
> "/usr/lib/python2.5/site-packages/Shapely-1.0.8-py2.5.egg/shapely/geomet
> ry/point.py",
> 
> line 10, in <module>
> 
>     from shapely.geos import lgeos, DimensionError
> 
>   File
> "/usr/lib/python2.5/site-packages/Shapely-1.0.8-py2.5.egg/shapely/geos.p
> y",
> 
> line 54, in <module>
> 
>     execfile(os.path.join(_here, 'ctypes_declarations.py'))
> 
>   File
> "/usr/lib/python2.5/site-packages/Shapely-1.0.8-py2.5.egg/shapely/ctypes
> _declarations.py",
> 
> line 19, in <module>
> 
>     lgeos.GEOS_getWKBOutputDims.restype = ctypes.c_int
> 
>   File "/usr/lib/python2.5/ctypes/__init__.py", line 361, in __getattr__
> 
>     func = self.__getitem__(name)
> 
>   File "/usr/lib/python2.5/ctypes/__init__.py", line 366, in __getitem__
> 
>     func = self._FuncPtr((name_or_ordinal, self))
> 
> AttributeError: /usr/lib/libgeos_c.so.1: undefined symbol:
> GEOS_getWKBOutputDims
> 
>  
> 
>  
> 
> I'm guessing that ctypes hates me. Any ideas as to why?
> 
>  
> 
> Thanks,  
> 
>  
> 
> Marc
> 
>  
> 
>  
> 
>  
> 
> n
> Marc Pfister
> Technology Manager
> ENPLAN
> mpfister at enplan.com
> 530/221-0440 x108
> 530/221-6963 Fax
> 
>  
> 
> 
> 
> 
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