bug fix pandas-dev#16524

Author: Pradyumna Reddy

doc/source/whatsnew/v0.20.2.txt

@@ -41,6 +41,7 @@ Bug Fixes
   detecting the terminal size. This fix only applies to python 3 (:issue:`16496`)
 - Bug in using ``pathlib.Path`` or ``py.path.local`` objects with io functions (:issue:`16291`)
 - Bug in ``DataFrame.update()`` with ``overwrite=False`` and ``NaN values`` (:issue:`15593`)
+- Bug in ``Series`` with dtype='category' (:issue:`16524`)
 
 
 

pandas/core/categorical.py

@@ -248,7 +248,8 @@ class Categorical(PandasObject):
     __array_priority__ = 1000
     _typ = 'categorical'
 
-    def __init__(self, values, categories=None, ordered=False, fastpath=False):
+    def __init__(self, values, categories=None, ordered=False, fastpath=False,
+                 **kwargs):
 
         self._validate_ordered(ordered)
 

pandas/tests/series/test_dtypes.py

@@ -12,7 +12,8 @@
 from numpy import nan
 import numpy as np
 
-from pandas import Series, Timestamp, Timedelta, DataFrame, date_range
+from pandas import (Categorical, Series, Timestamp, Timedelta,
+                    DataFrame, date_range)
 
 from pandas.compat import lrange, range, u
 from pandas import compat
@@ -248,3 +249,11 @@ def test_intercept_astype_object(self):
 
         result = df.values.squeeze()
         assert (result[:, 0] == expected.values).all()
+
+    def test_series_to_categorical(self):
+        series = Series(['a', 'b', 'c'])
+
+        categorical_series = Series(series, dtype='category')
+        expected = Categorical(['a', 'b', 'c'])
+
+        assert (categorical_series == expected).all()