python3-gdal: ImportError: No module named '_gdal_array'

[Bas Couwenberg]

As reported by Teemu Ikonen in ​Debian Bug #853900:

Trying to import osgeo.gdal_array module results in this:

$ python3 -c "import osgeo.gdal_array"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3/dist-packages/osgeo/gdal_array.py", line 168, in <module>
    import _gdal_array
ImportError: No module named '_gdal_array'

With the following changes the import error is fixed:

--- /usr/lib/python3/dist-packages/osgeo/gdal_array.py.bak      2017-02-01 23:04:50.776314931 +0100
+++ /usr/lib/python3/dist-packages/osgeo/gdal_array.py  2017-02-01 23:05:07.052629725 +0100
@@ -165,7 +165,7 @@
     return _gdal_array.RATValuesIONumPyRead(poRAT, nField, nStart, nLength)
 
 import numpy
-import _gdal_array
+from . import _gdal_array
 
 from . import gdalconst
 from . import gdal

Since gdal_array.py is generated by SWIG, swig/include/gdal_array.i should probably be modified instead, but that code already gets rewritten by SWIG:

 996 import numpy
 997 import _gdal_array
 998 
 999 import gdalconst
1000 import gdal

Is there some way to fix the SWIG interface file to have it converted properly for Python 3, or is this simply a bug in SWIG (3.0.10 is used)?

[Even Rouault]

In 37276:

Python bindings: fix 'import osgeo.gdal_array' with python3 and SWIG 3.0.10 (fixes #6801)

[Even Rouault]

In 37277:

Python bindings: fix 'import osgeo.gdal_array' with python3 and SWIG 3.0.10 (fixes #6801)

[Even Rouault]

I could indeed reproduce the issue with SWIG 3.0.10 but not with SWIG 3.0.8. I've fixed a push that seems to work OK with Python2/Python3 + SWIG 3.0.8/3.0.10 combinations

[Bas Couwenberg]

Thanks for the fixes, I'll included them as a patch in the Debian package.