Languages that can be used by a developer.

As a developer, it is important that you find the right language to master. Python is still one of the most used languages, but you want to make sure that you are current with others as well. It is important to note that there are wrong languages to choose that will put you behind the curve, as the landscape is ever-changing. Do some research on the Internet and describe one language other than Python that you feel would be beneficial to your career and one that would not. Be sure to include your reasoning. If you are not a developer, how does learning Python or other languages benefit you?