code sample for pandas-dev#48090

Author: simonjayhawkins

bisect/48090.py

@@ -0,0 +1,19 @@
+# REGR: ensure DataFrame.select_dtypes() returns a copy #48176
+
+import pandas as pd
+from pandas import DataFrame
+
+print(pd.__version__)
+
+# https://github.com/pandas-dev/pandas/issues/48090
+# result of this method is not a view on the original dataframe
+df = DataFrame({"a": [1, 2, 3], "b": [4, 5, 6]})
+df_orig = df.copy()
+
+result = df.select_dtypes(include=["number"])
+
+result.iloc[0, 0] = 0
+
+print(df)
+
+pd.testing.assert_frame_equal(df, df_orig)