[Answered ]-Handle unhandled exception from Python package

Why not have your 500.html template simply display the error message you want?

Otherwise, you could create a middleware to catch this error:

from django.shortcuts import render

class CatchOperationalError(object):
    def process_exception(self, request, exception):
        if type(exception).__name__ == 'OperationalError':  # replace with proper isinstance
            return render(request, 'wordpress_down.html')

https://docs.djangoproject.com/en/dev/topics/http/middleware/#process_exception

Another option would be to wrap each individual view in a try/except.