diff options
Diffstat (limited to 'Doc/library/os.path.rst')
| -rw-r--r-- | Doc/library/os.path.rst | 39 |
1 files changed, 33 insertions, 6 deletions
diff --git a/Doc/library/os.path.rst b/Doc/library/os.path.rst index ecbbc1d7605..1c1cf07a655 100644 --- a/Doc/library/os.path.rst +++ b/Doc/library/os.path.rst @@ -298,9 +298,10 @@ the :mod:`glob` module.) device than *path*, or whether :file:`{path}/..` and *path* point to the same i-node on the same device --- this should detect mount points for all Unix and POSIX variants. It is not able to reliably detect bind mounts on the - same filesystem. On Windows, a drive letter root and a share UNC are - always mount points, and for any other path ``GetVolumePathName`` is called - to see if it is different from the input path. + same filesystem. On Linux systems, it will always return ``True`` for btrfs + subvolumes, even if they aren't mount points. On Windows, a drive letter root + and a share UNC are always mount points, and for any other path + ``GetVolumePathName`` is called to see if it is different from the input path. .. versionchanged:: 3.4 Added support for detecting non-root mount points on Windows. @@ -408,9 +409,26 @@ the :mod:`glob` module.) system). On Windows, this function will also resolve MS-DOS (also called 8.3) style names such as ``C:\\PROGRA~1`` to ``C:\\Program Files``. - If a path doesn't exist or a symlink loop is encountered, and *strict* is - ``True``, :exc:`OSError` is raised. If *strict* is ``False`` these errors - are ignored, and so the result might be missing or otherwise inaccessible. + By default, the path is evaluated up to the first component that does not + exist, is a symlink loop, or whose evaluation raises :exc:`OSError`. + All such components are appended unchanged to the existing part of the path. + + Some errors that are handled this way include "access denied", "not a + directory", or "bad argument to internal function". Thus, the + resulting path may be missing or inaccessible, may still contain + links or loops, and may traverse non-directories. + + This behavior can be modified by keyword arguments: + + If *strict* is ``True``, the first error encountered when evaluating the path is + re-raised. + In particular, :exc:`FileNotFoundError` is raised if *path* does not exist, + or another :exc:`OSError` if it is otherwise inaccessible. + + If *strict* is :py:data:`os.path.ALLOW_MISSING`, errors other than + :exc:`FileNotFoundError` are re-raised (as with ``strict=True``). + Thus, the returned path will not contain any symbolic links, but the named + file and some of its parent directories may be missing. .. note:: This function emulates the operating system's procedure for making a path @@ -429,6 +447,15 @@ the :mod:`glob` module.) .. versionchanged:: 3.10 The *strict* parameter was added. + .. versionchanged:: next + The :py:data:`~os.path.ALLOW_MISSING` value for the *strict* parameter + was added. + +.. data:: ALLOW_MISSING + + Special value used for the *strict* argument in :func:`realpath`. + + .. versionadded:: next .. function:: relpath(path, start=os.curdir) |