There's no package manager so there's no way to install things and there's no Python included.
You could run your Windows Python but the paths will be wrong (C:\ instead of /c/), etc.
Git bash will translate /c/ to C:\ so that’s only sometimes true. But it won’t translate //c/ or if you set a certain env var… etc. Having to recall all these rules is one reason I dislike working in git bash on windows.