code sample for pandas-dev#46589

Author: simonjayhawkins

bisect/46589.py

@@ -0,0 +1,21 @@
+# BUG: df.nsmallest get wrong results when row contains NaN #46589
+
+import numpy as np
+import pandas as pd
+
+print(pd.__version__)
+
+df = pd.DataFrame(
+    {
+        "a": [1, 2, 3, 4, 5, None, 7],
+        "b": [7, 6, 5, 4, 3, 2, 1],
+        "c": [1, 1, 2, 2, 3, 3, 3],
+    },
+    index=np.random.rand(7),
+)
+
+result = df.nsmallest(5, columns=["a", "b"])
+print(result)
+
+expected = df.iloc[:5]
+pd.testing.assert_frame_equal(result, expected)