code sample for pandas-dev#42530

Author: simonjayhawkins

bisect/42530.py

@@ -0,0 +1,14 @@
+# BUG: KeyError when assigning to Series values after pop from DataFrame #42530
+
+import pandas as pd
+
+print(pd.__version__)
+
+df = pd.DataFrame({"a": [1, 2, 3], "b": [4, 5, 6]})
+s = df.pop("b")
+s[[True, False, False]] = 9
+
+print(s)
+
+expected = pd.Series([9,5,6], name="b")
+pd.testing.assert_series_equal(s, expected)