code sample for pandas-dev#43292

Author: simonjayhawkins

bisect/43292.py

@@ -0,0 +1,16 @@
+# BUG: inconsistent result when groupby then sum values that contain inf #43292
+
+import numpy as np
+import pandas as pd
+
+print(pd.__version__)
+
+df = pd.DataFrame(
+    {"a": ["hello", "hello", "world", "world"], "b": [np.inf, 10, np.nan, 10]}
+)
+
+gb = df.groupby("a")
+result = gb.sum()
+print(result)
+
+assert result.loc["hello", "b"] == np.inf, result.loc["hello", "b"]