code sample for pandas-dev#42731

simonjayhawkins · simonjayhawkins · commit fc8ba2df0d43 · 2021-07-27T11:23:47.000+01:00
diff --git a/bisect/42731.py b/bisect/42731.py
@@ -0,0 +1,10 @@
+# BUG: Series.groupby fails with InvalidIndexError on time series with a tuple-named grouper. #42731
+
+import pandas as pd
+
+print(pd.__version__)
+
+s = pd.Series(index=[pd.Timestamp(2021, 7, 26)], name=("A", 1))
+
+result = s.groupby(s==s)  # raises InvalidIndexError
+print(result)
