This is entirely backward. They all started switching when python was already immensely popular after the popularity boosts given by sysadmin, django and numerical/datascience users.
This is what I have seen as well. When Python became ubiquitous in the industry, they started teaching it in the colleges.
I come from a core science background. I studied Physics. And it was like this in my institute: FORTRAN -> A lot of C, small amount of FORTRAN -> C -> Python. I was taught C, but from the exact next year, it was switched to the Python ecosystem.
It was done much later when Python became the standard in research universities, the language of recent research papers, etc.
A generation of Scienctists learned C/FORTRAN/MATLAB in college/grad school as it was taught, but they switched to Python early/mid career. Teaching Python in undergrad followed.
I also taught a mid-career Economics professor Python. She used SPSS before for her papers. Humanities professors doing data crunching are now switching to Python, too. There is a clear trend.
