In the provided script, the function save_text opens the file "output.txt" in write mode ('w'):

with open("output.txt", "w") as f:
    f.write(text_input.get())

When the file is opened in write mode ('w'), it will:

Create the file "output.txt" if it doesn't already exist.
Overwrite the contents of the file if it does exist.
In this script, there is no "input.txt" being used, so you don't need to have "input.txt" saved in the file system.

If you want to append the text to the "output.txt" file instead of overwriting it, change the file opening mode from 'w' to 'a':

with open("output.txt", "a") as f:
    f.write(text_input.get())
    f.write('\n')  # Add a newline character to separate multiple inputs

This will create the file if it doesn't exist, and append the new text to the end of the file if it does exist.
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