2011/9/20 Thomas Paviot <tpav...@gmail.com>
> 2011/9/20 D. Barbier <bou...@gmail.com>
>
>> On 2011/9/1 D. Barbier wrote:
>> [...]
>> > $ LD_LIBRARY_PATH=$HOME/oce-dev/lib python test_all.py
>> > Traceback (most recent call last):
>> > File "test_all.py", line 29, in <module>
>> > import topology_operations_unittest
>> > File
>> "/home/barbier/Projects/pythonocc/src/unittest/topology_operations_unittest.py",
>> > line 34, in <module>
>> > from OCC.Utils.Construct import *
>> > File
>> "/home/barbier/.local/lib/python2.6/site-packages/OCC/Utils/Construct.py",
>> > line 50, in <module>
>> > from OCC.GEOMAlgo import GEOMAlgo_Splitter
>> > ImportError: No module named GEOMAlgo
>>
>> I modified Construct.py to not import GEOM,
>
>
> You're right, the depency of Construct.py with GEOM should be removed. It's
> a recent commit that is not consistent with the optional GEOM wrapper.
>
>
>> but get now a segmentation fault:
>> testHash (wrapper_features_unittest.TestWrapperFeatures) ... Test:
>> __hash__ overloading
>> Segmentation fault
>>
>> More precisely:
>> $ python
>> Python 2.6.7 (r267:88850, Aug 3 2011, 11:33:52)
>> [GCC 4.6.1] on linux2
>> Type "help", "copyright", "credits" or "license" for more information.
>> >>> import OCC.Standard
>> >>> s = OCC.Standard.Standard_Transient()
>> >>> hash1_s = s.__hash__()
>> >>> hash2_s = s.HashCode(pow(2,31)-1)
>> Segmentation fault
>>
>> But also:
>> $ python
>> Python 2.6.7 (r267:88850, Aug 3 2011, 11:33:52)
>> [GCC 4.6.1] on linux2
>> Type "help", "copyright", "credits" or "license" for more information.
>> >>> import OCC.Standard
>> >>> s = OCC.Standard.Standard_Transient()
>> >>> hash2_s = s.HashCode(pow(2,31)-1)
>> >>> hash1_s = s.__hash__()
>> Segmentation fault
>>
>> and even
>>
>> $ python
>> Python 2.6.7 (r267:88850, Aug 3 2011, 11:33:52)
>> [GCC 4.6.1] on linux2
>> Type "help", "copyright", "credits" or "license" for more information.
>> >>> import OCC.Standard
>> >>> s = OCC.Standard.Standard_Transient()
>> >>> hash1_s = s.__hash__()
>> >>> hash1_s = s.__hash__()
>> Segmentation fault
>>
>> Any idea about what is going on?
>>
>
> When compiling pythonocc, you must pass -D__PYTHONOCCOCC_MAXINT__ integer.
> It's equal to 2^32-1 on 32bit platforms, 2^64-1 on 64bit. This is computed
> from the file environment.py (
> https://github.com/tpaviot/pythonocc/blob/master/src/wrapper/environment.py)
> called when compiling pythonocc from the setup.py script.
>
> The __hash__() method does not take any argument. It is a wrapper for the
> HashCode method and is is defined in the SWIG file as:
>
> %extend Standard_Transient {
>
> Standard_Integer __hash__() {
> return $self->HashCode(__PYTHONOCC_MAXINT__);
> }
> };
>
> (see for instance the file Standard.i at
> https://github.com/tpaviot/pythonocc/blob/master/src/wrapper/SWIG/linux_darwin/Standard.i
> ).
>
>
>> Denis
>>
>
> Thomas
>
>
Sorry, it's 2^31-1 or 2^63-1 (not 2^32-1 and 2^64-1)
You can use the hash python builtin function to test that the __hash__
method works:
$ python
Python 2.6.1 (r261:67515, Jun 24 2010, 21:47:49)
[GCC 4.2.1 (Apple Inc. build 5646)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from OCC.Standard import *
>>> s = Standard_Transient()
>>> hash(s)
105437969
>>>
The __hash__ method was introduced to allow OCC objects be dict keys, or use
the 'in' list feature. For example :
$ python
Python 2.6.1 (r261:67515, Jun 24 2010, 21:47:49)
[GCC 4.2.1 (Apple Inc. build 5646)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from OCC.Standard import *
>>> s1 = Standard_Transient()
>>> s2 = Standard_Transient()
>>> s3 = Standard_Transient()
>>> s4 = Standard_Transient()
>>> l = [s1,s2,s3]
>>> l = [s1,s2,s3]
>>> s1 in l
True
>>> s2 in l
True
>>> s4 in l
False
or
>>> d = {}
>>> d[s1]= "A first transient"
>>> d[s2]= "A second transient"
>>> d
{<OCC.Standard.Standard_Transient; proxy of <Swig Object of type
'Standard_Transient *' at 0x10054a0c0> >: 'A first transient',
<OCC.Standard.Standard_Transient; proxy of <Swig Object of type
'Standard_Transient *' at 0x100545e70> >: 'A second transient'}
>>> d[s1]
'A first transient'
>>> d[s2]
'A second transient'
>>>
Thomas
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