Many USGS simulation modelers originally learned and still use some variant of Fortran. Fortunately, using Fortran executable from Python is a readily-doable task. Also, using Here are some web resources on this. There's lots more. Just google on "python fortran programmers".

- This actually part of scipy/numpy!
- Package is in F2py. Documentation is here.

- Python Scripting for Computational Science (Texts in Computational Science and Engineering) textbook
- Python versions of examples from Structured FORTRAN 77 for Engineers and Scientists
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