Over the last couple of years I've been tidying up the pathlib internals, with a view towards adding an AbstractPath class to the hierarchy. Users would be able to subclass AbstractPath to implement other kinds of filesystems: s3, google cloud storage, pandas, ftp, git, zip and tar files, etc. By implementing some abstract methods (stat(), iterdir(), open(), etc) they'd benefit from a number of derived methods (is_dir(), glob(), read_text(), etc). There's already a healthy ecosystem of PyPI packages attempting this, but there's presently no officially-supported route.
I've now submitted a PR that adds an initial underscore-prefixed implementation of this class: https://github.com/python/cpython/pull/31085. The implementation is simple: wherever Path calls functions in os, io, pwd, etc, AbstractPath instead raises NotImplementedError. The Path class becomes an implementation of AbstractPath. These methods directly raise NotImplementedError: cwd(), stat(), iterdir(), readlink(), resolve(), expanduser(), owner(), group(), open(), touch(), mkdir(), symlink_to(), hardlink_to(), rename(), replace(), chmod(), unlink(), rmdir() These methods call through to the above methods: absolute(), lstat(), exists(), is_dir(), is_file(), is_mount(), is_symlink(), is_block_device(), is_char_device(), is_fifo(), is_socket(), home(), samefile(), scandir(), glob(), rglob(), read_bytes(), read_text(), write_bytes(), write_text(), lchmod(), link_to() Some methods aren't applicable to some kinds of filesystems, e.g. zip files don't support symlinks, working directories or home directories. In these cases I think it's reasonable to raise NotImplementedError. Indeed, pathlib.Path methods already raise NotImplementedError when certain local filesystem features aren't available (readlink(), group(), etc). If any readers of this list have previously tried to extend pathlib to other domains, or are otherwise interested in pathlib development, please could you let me know what you think of the proposed API? Many thanks
_______________________________________________ Python-Dev mailing list -- python-dev@python.org To unsubscribe send an email to python-dev-le...@python.org https://mail.python.org/mailman3/lists/python-dev.python.org/ Message archived at https://mail.python.org/archives/list/python-dev@python.org/message/JB7QGDNI2CNXFX7LQQ2X2WPOZ7DWVNQL/ Code of Conduct: http://python.org/psf/codeofconduct/
