Hi JP, I'd love to be able to prevent this kind of breakage at installation. I've created https://github.com/Toblerity/Shapely/issues/218 to track the issue and welcome your comments there.
On Fri, Dec 26, 2014 at 8:33 PM, Juan Pablo Caram <jpca...@gmail.com> wrote: > > Hi Sean, > > I've been finding more problems having to do with newer versions of > Shapely with older versions of GEOS. Please look at the following: > > In[23]: from shapely.wkt import dumps > In[24]: from shapely.geometry import Point > In[25]: dumps(Point(0,0)) > Traceback (most recent call last): > File > "/usr/local/lib/python2.7/dist-packages/IPython/core/interactiveshell.py", > line 2883, in run_code > exec(code_obj, self.user_global_ns, self.user_ns) > File "<ipython-input-25-6b5b1cef3aeb>", line 1, in <module> > dumps(Point(0,0)) > File "/usr/local/lib/python2.7/dist-packages/shapely/wkt.py", line 22, > in dumps > return geos.WKTWriter(geos.lgeos, trim=trim, **kw).write(ob) > File "/usr/local/lib/python2.7/dist-packages/shapely/geos.py", line 309, > in __init__ > setattr(self, name, applied_settings[name]) > File "/usr/local/lib/python2.7/dist-packages/shapely/geos.py", line 317, > in __setattr__ > (self.__class__.__name__, name)) > AttributeError: 'WKTWriter' object has no attribute 'trim' > > My environment is: > > Shapely 1.5.1 > GEOS (3, 2, 2) > > I understand that my version of GEOS is quite old, but the problem is that > upgrading Shapely and keeping GEOS is breaking things. Can you confirm? > This is quite problematic when trying to install software which requires > Shapely. For example on Ubuntu, if I install the latest available Shapely > and the latest available GEOS I run into this situation, which didn't > happen with older versions of Shapely. > > Perhaps the way to go about this is to establish which is the minimum > version of GEOS required in a given version of Shapely and have Shapely > completely fail as early as possible (ideally on installation or on import > maybe?). > > Thanks, > > JP > > On Mon, Dec 15, 2014 at 3:10 PM, Juan Pablo Caram <jpca...@gmail.com> > wrote: >> >> Sean, >> I seems that it's all about a version of GEOS that it's too old. I will >> try upgrading to the latest and try again. >> Thanks a lot! >> JP >> >> On Mon, Dec 15, 2014 at 1:51 PM, Sean Gillies <sean.gill...@gmail.com> >> wrote: >>> >>> JP, >>> >>> Actually, you can call unary_union with an empty list in the latest >>> Shapely. >>> >>> >>> import shapely >>> >>> shapely.__version__ >>> '1.5.1' >>> >>> import shapely.geos >>> >>> shapely.geos.geos_version >>> (3, 4, 2) >>> >>> from shapely.ops import unary_union >>> >>> unary_union([]) >>> <shapely.geometry.collection.GeometryCollection object at 0x10c3b6050> >>> >>> In your case, the KeyError gets raised first (I believe because your >>> GEOS library is too old). Because cascaded_union has been aliased to >>> unary_union (in Shapely 1.4+), it's the same story there. >>> >>> On Mon, Dec 15, 2014 at 11:33 AM, Juan Pablo Caram <jpca...@gmail.com> >>> wrote: >>>> >>>> Hi Sean, >>>> >>>> Thanks for your response. What really concerns me here is that in case >>>> 1 (Newer GEOS and shapely) I cannot call cascaded_union (or unary_union) >>>> with an empty list. I could on earlier versions. >>>> >>>> Thanks, >>>> >>>> JP >>>> >>>> On Mon, Dec 15, 2014 at 12:15 PM, Sean Gillies <sean.gill...@gmail.com> >>>> wrote: >>>>> >>>>> Hi JP, >>>>> >>>>> As far as I can tell, the main difference between your cases is that >>>>> in case 2, the included GEOS lib has a version >= 3.3. GEOS 3.2.2 (which >>>>> is >>>>> 4.5 years old, by the way) does not support unary union. >>>>> >>>>> See >>>>> https://github.com/Toblerity/Shapely/blob/master/shapely/geos.py#L721 >>>>> <https://github.com/Toblerity/Shapely/blob/master/shapely/geos.py#L72> >>>>> >>>>> I admit that the KeyError is not the most helpful of errors. >>>>> NotSupported might be bettter. I'll create a new issue in the tracker. >>>>> >>>>> On Sat, Dec 13, 2014 at 3:18 PM, Juan Pablo Caram <jpca...@gmail.com> >>>>> wrote: >>>>> >>>>>> Hi, >>>>>> >>>>>> Could someone give me some light into this: I'm getting very >>>>>> different behavior between versions/platforms for cascaded_union and >>>>>> unary_union. I would like to know what it the expected/latest/correct >>>>>> behavior. These are the two cases: >>>>>> >>>>>> CASE 1 >>>>>> ====== >>>>>> >>>>>> Os: Ubuntu 12.04 >>>>>> libgeos-c1: 3.2.2-3ubuntu1 >>>>>> shapely: 1.5.1 >>>>>> python: 2.7.3 >>>>>> >>>>>> >>> cascaded_union([]) >>>>>> >>>>>> --------------------------------------------------------------------------- >>>>>> ValueError Traceback (most recent call >>>>>> last) >>>>>> /home/jpcaram/flatcam/<ipython-input-4-0c768f786c71> in <module>() >>>>>> ----> 1 cascaded_union([]) >>>>>> >>>>>> /usr/local/lib/python2.7/dist-packages/shapely/ops.pyc in >>>>>> cascaded_union(self, geoms) >>>>>> 128 subs[i] = g._geom >>>>>> 129 collection = lgeos.GEOSGeom_createCollection(6, subs, >>>>>> L) >>>>>> --> 130 return >>>>>> geom_factory(lgeos.methods['cascaded_union'](collection)) >>>>>> 131 >>>>>> 132 def unary_union(self, geoms): >>>>>> >>>>>> /usr/local/lib/python2.7/dist-packages/shapely/geometry/base.pyc in >>>>>> geom_factory(g, parent) >>>>>> 53 # Abstract geometry factory for use with topological >>>>>> methods below >>>>>> >>>>>> 54 if not g: >>>>>> ---> 55 raise ValueError("No Shapely geometry can be created >>>>>> from null value") >>>>>> 56 ob = BaseGeometry() >>>>>> 57 geom_type = geometry_type_name(g) >>>>>> >>>>>> ValueError: No Shapely geometry can be created from null value >>>>>> >>>>>> >>> unary_union([]) >>>>>> >>>>>> --------------------------------------------------------------------------- >>>>>> KeyError Traceback (most recent call >>>>>> last) >>>>>> /home/jpcaram/flatcam/<ipython-input-6-9089513baa4e> in <module>() >>>>>> ----> 1 unary_union([]) >>>>>> >>>>>> /usr/local/lib/python2.7/dist-packages/shapely/ops.pyc in >>>>>> unary_union(self, geoms) >>>>>> 146 subs[i] = g._geom >>>>>> 147 collection = lgeos.GEOSGeom_createCollection(6, subs, >>>>>> L) >>>>>> --> 148 return >>>>>> geom_factory(lgeos.methods['unary_union'](collection)) >>>>>> 149 >>>>>> 150 operator = CollectionOperator() >>>>>> >>>>>> KeyError: 'unary_union' >>>>>> >>>>>> >>> cascaded_union([Point(0,0)]) >>>>>> <shapely.geometry.point.Point at 0x201d510> >>>>>> >>>>>> >>> unary_union([Point(0,0)]) >>>>>> >>>>>> --------------------------------------------------------------------------- >>>>>> KeyError Traceback (most recent call >>>>>> last) >>>>>> /home/jpcaram/flatcam/<ipython-input-9-858a4018548e> in <module>() >>>>>> ----> 1 unary_union([Point(0,0)]) >>>>>> >>>>>> /usr/local/lib/python2.7/dist-packages/shapely/ops.pyc in >>>>>> unary_union(self, geoms) >>>>>> 146 subs[i] = g._geom >>>>>> 147 collection = lgeos.GEOSGeom_createCollection(6, subs, >>>>>> L) >>>>>> --> 148 return >>>>>> geom_factory(lgeos.methods['unary_union'](collection)) >>>>>> 149 >>>>>> 150 operator = CollectionOperator() >>>>>> >>>>>> KeyError: 'unary_union' >>>>>> >>>>>> >>>>>> CASE 2: >>>>>> ======= >>>>>> >>>>>> Os: Windows 7 >>>>>> python: 2.7.6 >>>>>> shapely: 1.3.0 (Installer came with geos) >>>>>> >>>>>> >>> cascaded_union([]) >>>>>> <shapely.geometry.collection.GeometryCollection at 0x7708830> >>>>>> >>>>>> >>> unary_union([]) >>>>>> <shapely.geometry.collection.GeometryCollection at 0x7708ab0> >>>>>> >>>>>> >>>>>> >>>>>> In CASE 1, everything is newer except for the python version. Has the >>>>>> behavior of shapely/geos changed? >>>>>> >>>>>> Thank You, >>>>>> >>>>>> JP >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> Community mailing list >>>>>> Community@lists.gispython.org >>>>>> http://lists.gispython.org/mailman/listinfo/community >>>>>> >>>>>> >>>>> >>>>> >>>>> -- >>>>> Sean Gillies >>>>> >>>>> _______________________________________________ >>>>> Community mailing list >>>>> Community@lists.gispython.org >>>>> http://lists.gispython.org/mailman/listinfo/community >>>>> >>>>> >>>> _______________________________________________ >>>> Community mailing list >>>> Community@lists.gispython.org >>>> http://lists.gispython.org/mailman/listinfo/community >>>> >>>> >>> >>> -- >>> Sean Gillies >>> >>> _______________________________________________ >>> Community mailing list >>> Community@lists.gispython.org >>> http://lists.gispython.org/mailman/listinfo/community >>> >>> > _______________________________________________ > Community mailing list > Community@lists.gispython.org > http://lists.gispython.org/mailman/listinfo/community > > -- Sean Gillies
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