I didn't answer the poll, since training and degrees can be very different things. Formally, I have had one two-unit course in FORTRAN (on punched cards!) as University-based computer training. That's it.
However, in graduate school my lab group put together an intense one-year seminar on numerical methods, primarily finite difference, finite element, orthogonal collocation and the like. BSD was everywhere (this was Berkeley in the late 1970s/early 1980s, after all) and everyone was using it and teaching each other. A friend in the department wrote drivers in assembly for a leading S100 company at the time, so I picked up some assembly from him. I picked up three or four new languages, teaching myself. None of this was for credit.
So is it a hobby for me? Well, I do support all of the hardware, software, networking and web sites for my little company. So I do get paid (indirectly) for that effort. All of it is self-taught.
There are lots of ways of learning that are not necessarily for college credit.
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