[GRASS-dev] [GRASS GIS] #3446: GRASS python library is not working with python 3

[GRASS GIS]

#3446: GRASS python library is not working with python 3
-------------------------------------+-------------------------
 Reporter:  lrntct                   |      Owner:  grass-dev@…
     Type:  defect                   |     Status:  new
 Priority:  major                    |  Milestone:  7.4.0
Component:  Python                   |    Version:  7.2.1
 Keywords:  python python3 temporal  |        CPU:  x86-64
 Platform:  Linux                    |
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 Various pygrass modules fail to import in Python 3.6.

 Python version:
 {{{
 Python 3.6.3 (default, Oct  3 2017, 21:45:48)
 [GCC 7.2.0] on linux
 }}}

 For example:
 {{{
 import grass.pygrass.gis
 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
   File "/usr/lib/grass72/etc/python/grass/pygrass/gis/__init__.py", line
 14, in <module>
     libgis.G_gisinit('')
   File "/usr/lib/grass72/etc/python/grass/lib/gis.py", line 3489, in
 G_gisinit
     return (G__gisinit (GIS_H_VERSION, pgm))
 ctypes.ArgumentError: argument 1: <class 'TypeError'>: wrong type
 }}}

 This issue prevents pygrass and the temporal framework to work with
 python3:

 {{{
 >>> import grass.temporal as tgis
 Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
   File "/usr/lib/grass72/etc/python/grass/temporal/__init__.py", line 3,
 in <module>
     from .core import *
   File "/usr/lib/grass72/etc/python/grass/temporal/core.py", line 45, in
 <module>
     from .c_libraries_interface import *
   File
 "/usr/lib/grass72/etc/python/grass/temporal/c_libraries_interface.py",
 line 28, in <module>
     from grass.pygrass.rpc.base import RPCServerBase
   File "/usr/lib/grass72/etc/python/grass/pygrass/rpc/__init__.py", line
 21, in <module>
     from grass.pygrass.vector import *
   File "/usr/lib/grass72/etc/python/grass/pygrass/vector/__init__.py",
 line 6, in <module>
     libgis.G_gisinit('')
   File "/usr/lib/grass72/etc/python/grass/lib/gis.py", line 3489, in
 G_gisinit
     return (G__gisinit (GIS_H_VERSION, pgm))
 ctypes.ArgumentError: argument 1: <class 'TypeError'>: wrong type
 }}}

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Ticket URL: <https://trac.osgeo.org/grass/ticket/3446>
GRASS GIS <https://grass.osgeo.org>