[Tutor] Website form data input

[Selby Rowley-Cannon]

Hello, 

    I am aiming to write a program that inputs a list of codes into an HTML text field, one by one, entering the next code if it is incorrect, but stopping when the code is correct. I've got down putting the codes into a list, and 'for' looping though it (maybe 'while' the entered code is incorrect?) but I don't know how to enter text into a text field in a website.
All help greatly appreciated, 
    -Selby
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