bpo-40275: Add os_helper submodule in test.support by shihai1991 · Pull Request #20765 · python/cpython
remove the following vars, functions, classes in os_helper:
- rmtree()
- unlink()
- rmdir()
- FS_NONASCII
- TESTFN_UNICODE, TESTFN_NONASCII, TESTFN_UNENCODABLE, TESTFN_UNDECODABLE
- SAVEDCWD
- temp_dir()
- change_cwd()
- temp_cwd()
- temp_umask()
- create_empty_file()
- make_bad_fd()
- EnvironmentVarGuard
- can_symlink(), skip_unless_symlink()
- can_xattr(), skip_unless_xattr()
- fs_is_case_insensitive()
- fd_count()
- FakePath