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https://aip.scitation.org/doi/pdf/10.1063/1.4822400

I can attest to Python usage in physics exploding after this. What Livermore says, you listen to. They were considered the best of best, after all.

An unknown student making an unknown library, no one cares. But when Livermore says, hey guys, Numeric is interesting, you listen.

Things rolled from there.

Here CERN usage of Python during those early 2000s.

https://lhcb-comp.web.cern.ch/support/CMT/cmt.htm

https://home.cern/news/press-release/cern/lhc-computing-grid...

https://cds.cern.ch/record/840543/files/lhcc-2005-024.pdf

I'm not sure I could find sources on the web any more easily than you. (Maybe start by looking at references in David Beazley's old talks?) I was in physics at the time, and what happened there was that Python basically enveloped Fortran & C++, letting people use the existing code without getting bogged down in complicated invocations.

https://www.youtube.com/watch?v=4RSht_aV7AU is a recent Beazley talk about that era.