From bc12c51857cc9ce0ca1873d95b8eb34c4b5cd424 Mon Sep 17 00:00:00 2001
From: Simon Hawkins <simonjayhawkins@gmail.com>
Date: Mon, 7 Jun 2021 19:47:32 +0100
Subject: [PATCH] add code sample for #40472

---
 bisect/40472.py | 13 +++++++++++++
 1 file changed, 13 insertions(+)
 create mode 100644 bisect/40472.py

diff --git a/bisect/40472.py b/bisect/40472.py
new file mode 100644
index 0000000000000..aba2cfbd00ff2
--- /dev/null
+++ b/bisect/40472.py
@@ -0,0 +1,13 @@
+# BUG: series.replace(np.nan,..) on categorical series does not replace #40472
+
+
+import numpy as np
+import pandas as pd
+
+print(pd.__version__)
+
+s = pd.Series({1: np.nan, 2: "b"}).astype("category")
+result = s.replace(np.nan, "c")
+print(result)
+
+assert result[1] == "c"