code sample for pandas-dev#46061

Author: simonjayhawkins

bisect/46061.py

@@ -0,0 +1,30 @@
+# BUG: groupby().rolling("freq") validation raises even if dates are sorted within each group #46061
+
+import pandas as pd
+
+print(pd.__version__)
+test_df = pd.DataFrame(
+    {
+        "Name": ["L", "L", "L", "M", "M", "M", "M", "M", "M"],
+        "ID": ["L1", "L2", "L3", "M1", "M2", "M3", "M4", "M5", "M6"],
+        "Date": [
+            "2005-01-01",
+            "2006-01-01",
+            "2013-01-01",
+            "2005-01-01",
+            "2006-01-01",
+            "2006-01-01",
+            "2017-01-01",
+            "2006-02-01",
+            "2006-03-01",
+        ],
+        "indicator": [0, 1, 0, 0, 1, 0, 0, 1, 0],
+        "rolling_sum": [0, 0, 1, 0, 0, 0, 0, 1, 2],
+    }
+)
+test_df["Date"] = pd.to_datetime(test_df["Date"], errors="coerce")
+
+grp = test_df.groupby("Name").rolling("731D", on="Date")
+
+print(grp)
+# grp["indicator"].sum().reset_index()