im not sure what ive done wrong code doesnt run

[Yoriz]

It doesn't run because you have a try without a matching except

There are a few issues with your code for starters:
again is assigned as 'y' and never re-assigned so the first while loop will always be True.
The second while loop is not required.
key is repeatedly assigned on every while loop iteration and is never used.
A file is opened and never closed
ans is not defined