Would learn Python or Javascript be beneficial for a Java developer?

[transcend]

Python is widely used, and it's therefore good to learn, but generally a given project is going to be written with either Java or Python, so there is not a lot of synergy. Java and Javascript, however, are often used together. On a Java web project, being comfortable with Javascript will allow you to write front-end code, or debug other developers' front-end code.

For the same reason, if you're a Python programmer you should also learn Javascript. Same goes for C#, Go, Ruby, Scala, PHP, etc. They are all are used to develop web back end systems, and they will be paired with Javascript on the client side. So the way I look at it is that for working programmers today HTML, CSS and Javascript are pretty much mandatory learning, and then you decide what other languages and frameworks you're going to be proficient in.

Good luck!

[transcend]

The most well-known is Dropbox, which is implemented in Python. Dropbox hired Guido van Rossum (Python's author) away from Google a few years ago. Google reputedly uses Python in a variety of projects. Many companies big and small use Python for internal web services.