I try all the words that start with the same letter that I have written in my copy, I will try btccreover
You just make things complicated and wasting time to make Python code to work.
FinderOuter is ready to use you don't need to make any Python code just to brute-force a one word from your seed.
Look at this sample
Source: https://bitcointalk.org/index.php?topic=5214021.msg62454836#msg62454836
Isn't that easy?