bpo-25803: Avoid incorrect errors raised by Path.mkdir(exist_ok=True)…#806

serhiy-storchaka merged 2 commits intopython:3.6python/cpython:3.6from

serhiy-storchaka:backport-af7b9ec-3.6serhiy-storchaka/cpython:backport-af7b9ec-3.6Copy head branch name to clipboard