Add deprecation doc

jseabold · jseabold · commit 5c7f8f10076d · 2020-08-28T16:49:46.000-05:00
diff --git a/doc/source/whatsnew/v1.2.0.rst b/doc/source/whatsnew/v1.2.0.rst
@@ -144,6 +144,7 @@ Deprecations
 ~~~~~~~~~~~~
 - Deprecated parameter ``inplace`` in :meth:`MultiIndex.set_codes` and :meth:`MultiIndex.set_levels` (:issue:`35626`)
 - Deprecated parameter ``dtype`` in :~meth:`Index.copy` on method all index classes. Use the :meth:`Index.astype` method instead for changing dtype(:issue:`35853`)
+- Deprecated default keyword argument of ``observed=False`` in :~meth:`DataFrame.groupby` and :~meth:`DataFrame.pivot_table` (:issue:`17594`)
 -
 
 .. ---------------------------------------------------------------------------

Original file line number	Diff line number	Diff line change
`@@ -144,6 +144,7 @@ Deprecations`
`144`	`144`	`~~~~~~~~~~~~`
`145`	`145`	- Deprecated parameter ``inplace`` in :meth:`MultiIndex.set_codes` and :meth:`MultiIndex.set_levels` (:issue:`35626`)
`146`	`146`	- Deprecated parameter ``dtype`` in :~meth:`Index.copy` on method all index classes. Use the :meth:`Index.astype` method instead for changing dtype(:issue:`35853`)
	`147`	+- Deprecated default keyword argument of ``observed=False`` in :~meth:`DataFrame.groupby` and :~meth:`DataFrame.pivot_table` (:issue:`17594`)
`147`	`148`	`-`
`148`	`149`
`149`	`150`	`.. ---------------------------------------------------------------------------`