Merge pull request #63 from pandas-dev/master

Sync Fork from Upstream Repo

Author: sthagen

ci/setup_env.sh

@@ -50,7 +50,7 @@ echo
 echo "update conda"
 conda config --set ssl_verify false
 conda config --set quiet true --set always_yes true --set changeps1 false
-conda install pip  # create conda to create a historical artifact for pip & setuptools
+conda install pip conda  # create conda to create a historical artifact for pip & setuptools
 conda update -n base conda
 
 echo "conda info -a"

pandas/tests/base/test_ops.py

@@ -277,6 +277,12 @@ def test_value_counts_unique_nunique_null(self, null_obj, index_or_series_obj):
             pytest.skip(f"values of {klass} cannot be changed")
         elif isinstance(orig, pd.MultiIndex):
             pytest.skip("MultiIndex doesn't support isna")
+        elif orig.duplicated().any():
+            pytest.xfail(
+                "The test implementation isn't flexible enough to deal"
+                " with duplicated values. This isn't a bug in the"
+                " application code, but in the test code."
+            )
 
         # special assign to the numpy array
         if is_datetime64tz_dtype(obj):