Build and deploy a USSD application with Africa's Talking, Docker and Heroku [Python] - Part 1

Hello Anthony, how can I go back to the previous screen in case of any error, for instance, if I want users to input their email, and I want to validate that email if its valid and if its not valid how can I maintain the same screen until the user input the valid email.

If you find any issues, don't mind raising them in the comments. Would love to make this article as accurate as possible. :)