Merge branch 'index_map' of https://github.com/Reksbril/pandas into index_map

Author: Mateusz Górski

pandas/tests/series/indexing/test_indexing.py

@@ -950,3 +950,12 @@ def test_index_map():
         b.index = a.index.map(lambda x: (x.year, x.month))
     except ValueError:
         pytest.fail("Unexpected ValueError")
+
+
+def test_uint_drop(any_int_dtype):
+    # see GH18311
+    # assigning series.loc[0] = 4 changed series.dtype to int
+    series = pd.Series([1, 2, 3], dtype=any_int_dtype)
+    series.loc[0] = 4
+    expected = pd.Series([4, 2, 3], dtype=any_int_dtype)
+    tm.assert_series_equal(series, expected)