I was recently playing around with a bash shell and deleted some files, like my .bashrc file. I mostly knew what I was doing, but I wanted to experiment with my new account. I thought, "I will delete these files just to see what happens; if I end up breaking something I've lost nothing because I have nothing invested." Now I've, sort of, ruined my development environment and I want to start over, I want to go back to the safety of a fresh start. I believe this is an essential usability feature for any application, users should never feel more than one click way from familiar ground.
I propose a "reset my account" button which will restore an account to it's original state.
I don't know to what extent people can mess up PythonAnywhere, but I imagine there could be some tricky problems. Software can be very complex, and it's a good feeling to know "I setup this application once, and I can do it again." If you have your code and content backed up then resetting your account and redeploying your application seems like a good last resort for solving problems.