code sample for pandas-dev#46297

Author: simonjayhawkins

bisect/46297.py

@@ -0,0 +1,15 @@
+# BUG: Error writing DataFrame with categorical type column and interval data to a CSV file #46297
+
+import pandas as pd
+
+print(pd.__version__)
+
+df = pd.DataFrame(index=[0], columns=["a"])
+df.at[0, "a"] = pd.Interval(pd.Timestamp("2020-01-01"), pd.Timestamp("2020-01-02"))
+df["a"] = df["a"].astype("category")  # astype("object") does not raise an error
+
+result = df.to_csv()
+print(result)
+
+expected = ',a\n0,"(2020-01-01, 2020-01-02]"\n'
+assert result == expected