changing default to None

Author: reidy-p

doc/source/whatsnew/v0.23.0.txt

@@ -740,7 +740,7 @@ Deprecations
 
 - ``pandas.tseries.plotting.tsplot`` is deprecated. Use :func:`Series.plot` instead (:issue:`18627`)
 - ``Index.summary()`` is deprecated and will be removed in a future version (:issue:`18217`)
-- The ``convert_datetime64`` parameter in :func:`DataFrame.to_records` has been deprecated and the default value is now ``False``. The NumPy bug motivating this parameter has been resolved (:issue:`18160`).
+- The ``convert_datetime64`` parameter in :func:`DataFrame.to_records` has been deprecated and will be removed in a future version. The NumPy bug motivating this parameter has been resolved (:issue:`18160`).
 
 .. _whatsnew_0230.prior_deprecations:
 

pandas/core/frame.py

@@ -1287,7 +1287,7 @@ def from_records(cls, data, index=None, exclude=None, columns=None,
 
         return cls(mgr)
 
-    def to_records(self, index=True, convert_datetime64=False):
+    def to_records(self, index=True, convert_datetime64=None):
         """
         Convert DataFrame to a NumPy record array.
 
@@ -1355,7 +1355,7 @@ def to_records(self, index=True, convert_datetime64=False):
                   dtype=[('index', '<M8[ns]'), ('A', '<i8'), ('B', '<f8')])
         """
 
-        if convert_datetime64:
+        if convert_datetime64 is not None:
             warnings.warn("The 'convert_datetime64' parameter is "
                           "deprecated and will be removed in a future "
                           "version",

pandas/tests/frame/test_convert_to.py

@@ -83,8 +83,9 @@ def test_to_records_dt64(self):
             result = df.to_records(convert_datetime64=True)['index'][0]
             assert expected == result
 
-        rs = df.to_records(convert_datetime64=False)
-        assert rs['index'][0] == df.index.values[0]
+        with tm.assert_produces_warning(FutureWarning):
+            rs = df.to_records(convert_datetime64=False)
+            assert rs['index'][0] == df.index.values[0]
 
     def test_to_records_with_multindex(self):
         # GH3189