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If the issue concerns an operator that grab geodata from an external web service (Basemaps, OSM, SRTM), then it can be a network

See below; version 2.4.2 from the ubuntugis ppa.

Expected output is just the version information, no crash.

$ gdal2tiles.py --version
GDAL 2.4.2, released 2019/06/28
Traceback (most recent call last):
  File "/usr/bin/gdal2tiles.py", line 2927, in <module>
    main()
  File "/usr/bin/gdal2tiles.py", line 2917, in main
    input_file, output_folder, options = process_args(argv[1:])

rasterio.warp.reproject takes a kwargs parameter, which is passed to the "transformation function". It is not by any means clear what this means. What transformation function? What are the allowed values for kwargs? Can this please be expanded on? Thanks.

Is your feature request related to a problem? Please describe.

The code of the Python package called grass which comes with GRASS GIS is hidden among C libraries in lib. It may look like it is a C library to use/communicate with Python.

If you are somewhat familiar with writing Python packages, you will be looking for directory which matches the name of the package.

It is not possible

In some ways fasterize does diverge from rasterize (e.g., #13). These should be tersely described in the README/vignette and function documentation.