fix(python): Ensure explicit values given to column_widths override…

… autofit in `write_excel` (#20893)

py-polars/polars/dataframe/frame.py

@@ -3542,6 +3542,18 @@ def write_excel(
         else:
             hidden = set(_expand_selectors(df, hidden_columns))
 
+        # Autofit section needs to be present above column_widths section
+        # to ensure that parameters provided in the column_widths section
+        # are not overwritten by autofit
+        #
+        # table/rows all written; apply (optional) autofit
+        if autofit and not is_empty:
+            xlv = xlsxwriter.__version__
+            if parse_version(xlv) < (3, 0, 8):
+                msg = f"`autofit=True` requires xlsxwriter 3.0.8 or higher, found {xlv}"
+                raise ModuleUpgradeRequiredError(msg)
+            ws.autofit()
+
         if isinstance(column_widths, int):
             column_widths = dict.fromkeys(df.columns, column_widths)
         else:
@@ -3588,14 +3600,6 @@ def write_excel(
                 for idx, height in _unpack_multi_column_dict(row_heights).items():  # type: ignore[assignment]
                     ws.set_row_pixels(idx, height)
 
-        # table/rows all written; apply (optional) autofit
-        if autofit and not is_empty:
-            xlv = xlsxwriter.__version__
-            if parse_version(xlv) < (3, 0, 8):
-                msg = f"`autofit=True` requires xlsxwriter 3.0.8 or higher, found {xlv}"
-                raise ModuleUpgradeRequiredError(msg)
-            ws.autofit()
-
         if freeze_panes:
             if isinstance(freeze_panes, str):
                 ws.freeze_panes(freeze_panes)