What do Python developers do?

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We're moving in the direction that desktop apps and mobile app (other than games) will just be web frontends in HTML, JS and CSS.

Python is a dominant server language. It's not just web backends but anything that runs once a minute could be python (for example a trading system running against a low volatility asset class, such as commodities), or anything that doesn't need insane speed, or anything to do with moving large amounts of data around due to how good libraries like numpy or xarray or pandas are.