I have spent around 6 weeks with Scala. I had spent around 12 weeks with Python, guiding 2 Python developments and a Scala development currently.
One point, I must highlight is that the final performance of what you develop and deploy is not dependent on the language you use. It is more dependent on the architecture you use to develop your application. Also, in a project, you may use one or more languages to develop/re-use code in building the different components of the application.
In the table, I have listed a few points of comparison between Scala and Python.