Hi, Definitely worth learning C++ and Java simply because there is so much code out there written in them. Also languages and tech that are painful to use often pay more ;)
But I know what you mean about joy... Python is designed to mostly be nice to the programmer over the computer. Apart from tests, tools like pep8, and pyflakes are nice to run on your code. Whereas fuzzing, unit, functional, integration, monitoring and other types of tests help programmers out a lot too. http://www.sqlite.org/testing.html
