Entering information from an entry box to a database table using SQLite (Python)

How do I get the information that is entered by a user in an entry box that was created using Tkinter onto a database? I have tried using the get command and putting the information in a list that way but I keep on getting 'None type has not attribute get' etc. My code is too long to put on here so I just need a short answer with an example if possible? My python and sql understanding is not so good so please try to explain it in a simple way. Thanks