5. The Top Programming Languages 2019
IEEE Spectrum, “The Top Programming Languages 2019”
https://spectrum.ieee.org/computing/software/the-top-programming-languages-2019
17. PyCon JP 2019基調講演
“Why Python is Eating the World”
YouTube, “01-100_Opening+KeyNote_Why Python is Eating the World (Cory Althoff)”
https://www.youtube.com/watch?v=Bcxz-jXMLZk
(30:00くらいから)