bpo-37330: open() no longer accept 'U' in file mode (GH-16959)
open(), io.open(), codecs.open() and fileinput.FileInput no longer
accept "U" ("universal newline") in the file mode. This flag was
deprecated since Python 3.3.diff --git a/Doc/library/fileinput.rst b/Doc/library/fileinput.rst
index f5e5280..8870c17 100644
--- a/Doc/library/fileinput.rst
+++ b/Doc/library/fileinput.rst
@@ -148,8 +148,8 @@
The sequence must be accessed in strictly sequential order; random access
and :meth:`~io.TextIOBase.readline` cannot be mixed.
- With *mode* you can specify which file mode will be passed to :func:`open`. It
- must be one of ``'r'``, ``'rU'``, ``'U'`` and ``'rb'``.
+ With *mode* you can specify which file mode will be passed to :func:`open`.
+ It must be ``'r'`` or ``'rb'``.
The *openhook*, when given, must be a function that takes two arguments,
*filename* and *mode*, and returns an accordingly opened file-like object. You
@@ -166,15 +166,14 @@
.. versionchanged:: 3.2
Can be used as a context manager.
- .. deprecated:: 3.4
- The ``'rU'`` and ``'U'`` modes.
-
.. deprecated:: 3.8
Support for :meth:`__getitem__` method is deprecated.
.. versionchanged:: 3.8
The keyword parameter *mode* and *openhook* are now keyword-only.
+ .. versionchanged:: 3.9
+ The ``'rU'`` and ``'U'`` modes have been removed.
**Optional in-place filtering:** if the keyword argument ``inplace=True`` is