Python bindings to gdal should make use of extras feature for packaging. #2158
Description
Expected behavior and actual behavior.
numpy is an optional package for the python gdal bindings. It would be nice if we could make use of the extras feature when packaging, so that you could have something like
gdal[numpy]
in a requirements.txt file.
Otherwise, the order of the packages you install becomes important, leading to problems like those encountered by users as described here and here.
Steps to reproduce the problem.
If you install gdal followed by numpy then you don't get the numpy features of gdal, and you have to work hard to correct this, e.g.,:
pip install gdal==2.4.2
pip install numpy
python -c 'from osgeo import gdal_array'
Traceback (most recent call last):
File "/home/robert/miniconda3/envs/gdal/lib/python3.7/site-packages/osgeo/gdal_array.py", line 18, in swig_import_helper
fp, pathname, description = imp.find_module('_gdal_array', [dirname(__file__)])
File "/home/robert/miniconda3/envs/gdal/lib/python3.7/imp.py", line 296, in find_module
raise ImportError(_ERR_MSG.format(name), name=name)
ImportError: No module named '_gdal_array'
install gdal==2.4.2
Requirement already satisfied: gdal==2.4.2 in ./miniconda3/envs/gdal/lib/python3.7/site-packages (2.4.2)
pip install --force-reinstall gdal==2.4.2 --no-cache-dir
python -c 'from osgeo import gdal_array'
What would be nice would be if you could do:
pip install gdal[numpy]==2.4.2
This current behaviour me a problem when using pip-tools, which parses a requirements.in file to produce a requirements.txt file, and one step involves an alphabetical sorting. Because gdal comes before numpy. See Issue #992
Operating system
lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.3 LTS
Release: 18.04
Codename: bionic
GDAL version and provenance
$ dpkg -l libgdal-dev
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Conf-files/Unpacked/halF-conf/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Reinst-required (Status,Err: uppercase=bad)
||/ Name Version Architecture Description
+++-============================================-===========================-===========================-==============================================================================================
ii libgdal-dev 2.4.2+dfsg-1~bionic0 amd64 Geospatial Data Abstraction Library - Development files