Git: branching?

Question

I got a local script of which I want to have 2 version. So I went to the directory of the script and did this:

git init
git add myscript.py
git commit -m "initial"
git checkout -b test_branch

After that I opened the script in an editor and wrote "foobar" at the end of the file. Then I went back to console and wrote:

git checkout master

So basically I switched from my test_branch back to master. I opened the script and there was still the "foobar" at the end. I was expecting it not to appear since I wrote it into the file when I was in the test_branch?

Answer 1

After you checkout to test_branch and you do some changes there, then before you checkout your master branch, you first need to commit all the changes made to the test_branch.

So it would be like:

git init                      #initializing
git add myscript.py           #added a file, ready to commit
git commit -m "initial"       #initial commit made to master

git checkout -b test_branch   #created and checked out a new branch
git add myscript.py           #add a file, ready to commit to test_branch
git commit -m 'other version' #commit the changes made to test_branch
git checkout master           #checkout master again