Simplicity of deployment. No need to compile. People bitch about virtualenvs but they pretty much just work.

Also, totally FOSS. Unparalleled library ecosystem (no, I don't buy into the hype about re-rolling all your own dependencies).

Beyond that, Go is kind of nice, but the lack of a inheritance is stifling. Python has everything that's needed and very little that's not.

Edit: Getting downvoted, probably because of the comment about virtualenvs. What's your alternative? .NET DLL's? The joke that is NPM? Go probably does this better, admittedly, but Python is practically one of the best out there.