code sample for pandas-dev#45778

Author: simonjayhawkins

bisect/45778.py

@@ -0,0 +1,12 @@
+# BUG: setting with loc breaks in 1.4.0 when indexing using an all-False boolean series #45778
+
+import pandas as pd
+
+print(pd.__version__)
+
+foo = pd.Series([1, 2, 3, 4, 5], index=["a", "b", "c", "d", "e"])
+bar = pd.Series([6, 7, 8, 9, 10], index=["a", "b", "c", "d", "e"])
+
+# works in 1.3 but breaks in 1.4
+foo.loc[foo > 100] = bar
+print(foo)