code sample for pandas-dev#38642

Author: simonjayhawkins

bisect/38642.py

@@ -0,0 +1,15 @@
+import pandas as pd
+
+print(pd.__version__)
+
+df = pd.DataFrame(
+    {"key": pd.Categorical(["b"] * 5, categories=["a", "b", "c", "d"]), "col": range(5)}
+)
+
+gb = df.groupby("key")
+
+result = list(gb.indices)
+print(result)
+# Out[12]: ['a', 'b', 'c', 'd']
+
+assert result == ["a", "b", "c", "d"]