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guis and data

In addition to the GUI code, you need to write the function that
will save the data from the GUI to the deliveries.txt file.

The Save button on the interface is going to call a function called save_data(). The function will
append the data from the GUI to the end of the deliveries.txt file formatted like this:

Depot:
Seattle, WA
Description:
Books
Address:
1 Main Street
Anytown
WA

Then it will need to clear the fields on the form to make them ready for the next record to be entered.
The function will have to appear in the program before the GUI code. Write the code for the function
here:
Don't forget: it FIRST
needs to save the data.
THEN it needs to clear
the fields.

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