addition of deleted file

Author: eyrei123

polars-v-pandas/dataframe_conversions.py

@@ -0,0 +1,29 @@
+import narwhals as nw
+import polars as pl
+from data_generation import generate_data
+
+polars_df = pl.DataFrame(data_generation(4))
+polars_df
+
+pandas_df = polars_df.to_pandas()
+type(pandas_df)
+pandas_df
+
+polars_df = pl.from_pandas(pandas_df)
+type(polars_df)
+polars_df
+
+
+def agnositic_groupby(df):
+    return (
+        nw.from_native(df)
+        .group_by("region")
+        .agg(nw.col("sales_income").sum())
+        .sort("region")
+        .to_native()
+    )
+
+
+agnositic_groupby(pandas_df)
+
+agnositic_groupby(polars_df)