[Dave3of5]

My experience is the opposite. You python code all it needed was a Requirements.txt and a pip install and the tooling takes care of the rest, been like that for years.

Any non trivial 40-year Fortran code though works with a specific compiler good luck getting that to run on a modern computer.

Also to note is that date parsing is complex. I can see why most would prefer to use a properly tested lib to do it. I've seen far too many handcrafted date parsers that suck and break in crazy ways over the years.