Undocumented functionsglob0() andglob1() were just helpers forglob.iglob(). They are not underscored because theglob module has__all__. They survived numerous refactorings only because they were used in themsilib module and some MSI related scripts. But themsilib module and these scripts have been removed.

glob1(root_dir, pattern) is equivalent toiglob1(os.path.join(glob.escape(root_dir), pattern)), but more restricted and slightly faster, because it does not need to escaperoot_dir and process the result.

Other alternative isiglob(pattern, root_dir=root_dir), which can even be faster, but it emits paths relative toroot_dir. You can use(os.path.join(root_dir, p) for p in iglob(pattern, root_dir=root_dir)) if you need to appendroot_dir. Actually, creating an efficient replacement ofglob1() was one of purposes ofroot_dir.

glob0(root_dir, name) just checks thatos.path.join(root_dir, name) exists. I did not see its use in third-party code.

Linked PRs

• GH-117337: Deprecateglob.glob0() andglob.glob1(). #117371