There is also a funny effect which is driving Python to be the most "popular" language. Someone will post a job advert for e.g. Java, and list Python as being one of the "nice to have" languages, either due to machine learning, devops, or just because it's nice to know a scripting language. Python is currently the nice to have language. So you see it on the list of hot languages, but in fact there are not all that many Python jobs, they are all actually e.g. Java jobs.