Yes, using a remote code repository (i.e. git) - plenty of options aside from github.

Merely git pull the repository to whatever machine you want to work on and commit the changes back (rinse, repeat)

Exactly this - if a corporation uses Python we should expect them to fund the PSF in someway, not balk at it when they do.

Also, if we had a functional US government, a corporation wouldn’t have needed to pick up the slack.