Docs

Author: StanFromIreland

Doc/library/datetime.rst

@@ -1076,13 +1076,12 @@ Other constructors, all class methods:
    ISO 8601 format, with the following exceptions:
 
    1. Time zone offsets may have fractional seconds.
-   2. The ``T`` separator may be replaced by any single unicode character.
-   3. Fractional hours and minutes are not supported.
-   4. Reduced precision dates are not currently supported (``YYYY-MM``,
+   2. Fractional hours and minutes are not supported.
+   3. Reduced precision dates are not currently supported (``YYYY-MM``,
       ``YYYY``).
-   5. Extended date representations are not currently supported
+   4. Extended date representations are not currently supported
       (``±YYYYYY-MM-DD``).
-   6. Ordinal dates are not currently supported (``YYYY-OOO``).
+   5. Ordinal dates are not currently supported (``YYYY-OOO``).
 
    Examples::
 
@@ -1111,6 +1110,8 @@ Other constructors, all class methods:
    .. versionchanged:: 3.11
       Previously, this method only supported formats that could be emitted by
       :meth:`date.isoformat` or :meth:`datetime.isoformat`.
+   .. versionchanged:: next
+      Separators other than ``T`` are deprecated.
 
 
 .. classmethod:: datetime.fromisocalendar(year, week, day)

Lib/_pydatetime.py

@@ -9,8 +9,6 @@
 import time as _time
 import math as _math
 import sys
-
-import warnings
 from operator import index as _index
 
 def _cmp(x, y):

Misc/NEWS.d/next/Library/2025-03-20-18-00-00.gh-issue-115783.befw32.rst

@@ -0,0 +1 @@
+Deprecate support for invalid ISO formats in :func:`datetime.datetime.fromisoformat`