How to merge specific files from Git branches

Question

I have 2 git branches branch1 and branch2 and I want to merge file.py in branch2 into file.py in branch1 and only that file.

In essence I just want to work on the fi

Answer 1

The solution I found that caused me the least headaches:

git checkout 
git checkout -b dummy
git merge 
git checkout 
git checkout dummy 

After doing that the file in path to file in b2 is what it would be after a full merge with b1.