While this question was asked a while ago and I don't know the state of the libraries at that point, it is worth mentioning for searchers that GitPython does a good job of abstracting the command line tools so that you don't need to use subprocess. There are some useful built in abstractions that you can use, but for everything else you can do things like:

import git
repo = git.Repo( '/home/me/repodir' )
print repo.git.status()
# checkout and track a remote branch
print repo.git.checkout( 'origin/somebranch', b='somebranch' )
# add a file
print repo.git.add( 'somefile' )
# commit
print repo.git.commit( m='my commit message' )
# now we are one commit ahead
print repo.git.status()

Everything else in GitPython just makes it easier to navigate. I'm fairly well satisfied with this library and appreciate that it is a wrapper on the underlying git tools.

UPDATE: I've switched to using the sh module for not just git but most commandline utilities I need in python. To replicate the above I would do this instead:

import sh
git = sh.git.bake(_cwd='/home/me/repodir')
print git.status()
# checkout and track a remote branch
print git.checkout('-b', 'somebranch')
# add a file
print git.add('somefile')
# commit
print git.commit(m='my commit message')
# now we are one commit ahead
print git.status()

I opened CMD and entered the following command pip install GitPython to install git

GitPython provides a git module for Python code, but it does not provide Git itself. GitPython does most of its work by using the external git command that Git provides. So GitPython needs Git to be present.

For the GitPython git module to make use of this external git command, the external command must either be runnable as git from the environment in which you run the Python process that uses GitPython, or specially configured as described in the message you saw. In most cases, it either is present as git or is intended to be present as git.

Is Git installed? If it is installed and usable, then running git version from the command line should show something like git version 2.43.0.windows.1.

If you are able to successfully run git version from the same command line that you run python on, then GitPython should usually be able to use it as well, and if it cannot then this might be due to a bug in GitPython. But if git version does not work when you run it, then GitPython will usually be unable to run the external git command for the same reason you are unable to run it directly (whatever that reason happens to be).