Add whatsnew entry.

Oleh Kozynets · Oleh Kozynets · commit 746852ecb59a · 2020-11-17T21:26:45.000+01:00
diff --git a/doc/source/whatsnew/v1.2.0.rst b/doc/source/whatsnew/v1.2.0.rst
@@ -458,6 +458,7 @@ Deprecations
 - :meth:`Categorical.is_dtype_equal` and :meth:`CategoricalIndex.is_dtype_equal` are deprecated, will be removed in a future version (:issue:`37545`)
 - :meth:`Series.slice_shift` and :meth:`DataFrame.slice_shift` are deprecated, use :meth:`Series.shift` or :meth:`DataFrame.shift` instead (:issue:`37601`)
 - Partial slicing on unordered :class:`DatetimeIndexes` with keys, which are not in Index is deprecated and will be removed in a future version (:issue:`18531`)
+- The ``inplace`` parameter of :meth:`Categorical.remove_unused_categories` is deprecated and will be removed in a future version (:issue:`37643`)
 
 .. ---------------------------------------------------------------------------
 
diff --git a/pandas/core/arrays/categorical.py b/pandas/core/arrays/categorical.py
@@ -1076,7 +1076,8 @@ def remove_unused_categories(self, inplace=no_default):
             warn(
                 "The `inplace` parameter in pandas.Categorical.remove_unused_categories"
                 " is deprecated and will be removed in a future version.",
-                FutureWarning, stacklevel=2
+                FutureWarning,
+                stacklevel=2,
             )
 
         cat = self.copy()

Original file line number	Diff line number	Diff line change
`@@ -1076,7 +1076,8 @@ def remove_unused_categories(self, inplace=no_default):`
`1076`	`1076`	`warn(`
`1077`	`1077`	"The `inplace` parameter in pandas.Categorical.remove_unused_categories"
`1078`	`1078`	`" is deprecated and will be removed in a future version.",`
`1079`		`- FutureWarning, stacklevel=2`
	`1079`	`+ FutureWarning,`
	`1080`	`+ stacklevel=2,`
`1080`	`1081`	`)`
`1081`	`1082`
`1082`	`1083`	`cat = self.copy()`