code sample for pandas-dev#42405

Author: simonjayhawkins

bisect/42405.py

@@ -0,0 +1,14 @@
+# BUG: isin() with missing values does not work in 1.3.0 with extension dtypes #42405
+
+import pandas as pd
+
+print(pd.__version__)
+
+s = pd.Series([0, None, 2, 3, 4], dtype="Int64")
+
+result = s.isin([1, 2, 3])
+print(result)
+
+expected = pd.Series([False, False, True, True, False])
+
+pd.testing.assert_series_equal(result, expected)