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Validation can be defined by many different methods, and deployed in many different ways.

Server side validation is performed by a web server, after input has been sent to the server.

Try a couple of things yourself and, when getting stuck somewhere, post a specific question here (and post the code that didn't work).

: "); user Input = user Input.lower(); #Validate input while user Input in ['yes', 'no']: print ("Invalid input.Jess also explains how to secure your site with user permissions, optimize its performance, and deploy it to the world.So I've searched just about every permutation of the words "string", "python", "validate", "user input", and so on, but I've yet to come across a solution that's working for me.Client side validation is performed by a web browser, before input is sent to a web server.Input validation is performed to ensure only properly formed data is entering the workflow in an information system, preventing malformed data from persisting in the database and triggering malfunction of various downstream components.