Add changes from reviewer

doc/source/whatsnew/v0.24.0.rst

@@ -362,7 +362,7 @@ See the :ref:`Advanced documentation on renaming<advanced.index_names>` for more
 Other Enhancements
 ^^^^^^^^^^^^^^^^^^
 
-- Added support for %G strptime directive in parsing datetimes
+- Added support for ISO week year format when parsing datetimes using `to_datetime` (:issue:`16607`)
 - :func:`merge` now directly allows merge between objects of type ``DataFrame`` and named ``Series``, without the need to convert the ``Series`` object into a ``DataFrame`` beforehand (:issue:`21220`)
 - ``ExcelWriter`` now accepts ``mode`` as a keyword argument, enabling append to existing workbooks when using the ``openpyxl`` engine (:issue:`3441`)
 - ``FrozenList`` has gained the ``.union()`` and ``.difference()`` methods. This functionality greatly simplifies groupby's that rely on explicitly excluding certain columns. See :ref:`Splitting an object into groups <groupby.split>` for more information (:issue:`15475`, :issue:`15506`).

pandas/tests/indexes/datetimes/test_tools.py

@@ -253,6 +253,7 @@ class TestToDatetime(object):
         ['2015-1-7', '%G-%V-%u', datetime(2015, 1, 4, 0, 0)]
     ])
     def test_to_datetime_iso_week_year_format(self, s, _format, dt):
+        # See GH#16607
         assert to_datetime(s, format=_format) == dt
 
     @pytest.mark.parametrize("msg, s, _format", [
@@ -291,6 +292,7 @@ def test_to_datetime_iso_week_year_format(self, s, _format, dt):
          "'%G' and a weekday directive '%A', '%a', '%w', or '%u'.", "20", "%V"]
     ])
     def test_ValueError_iso_week_year(self, msg, s, _format):
+        # See GH#16607
         with pytest.raises(ValueError, message=msg):
             to_datetime(s, format=_format)