fix: header should be provided with a bool value

taipy/core/data/csv.py

@@ -188,7 +188,7 @@ class CSVDataNode(DataNode, _FileDataNodeMixin, _TabularDataNodeMixin):
             )
         else:
             self._convert_data_to_dataframe(exposed_type, data).to_csv(
-                self._path, index=False, encoding=self.properties[self.__ENCODING_KEY], header=None
+                self._path, index=False, encoding=self.properties[self.__ENCODING_KEY], header=False
             )
 
     def write_with_column_names(self, data: Any, columns: Optional[List[str]] = None, job_id: Optional[JobId] = None):
@@ -201,6 +201,6 @@ class CSVDataNode(DataNode, _FileDataNodeMixin, _TabularDataNodeMixin):
         """
         df = self._convert_data_to_dataframe(self.properties[self._EXPOSED_TYPE_PROPERTY], data)
         if columns and isinstance(df, pd.DataFrame):
-            df.columns = columns
+            df.columns = pd.Index(columns, dtype="object")
         df.to_csv(self._path, index=False, encoding=self.properties[self.__ENCODING_KEY])
         self.track_edit(timestamp=datetime.now(), job_id=job_id)

taipy/core/data/excel.py

@@ -301,7 +301,7 @@ class ExcelDataNode(DataNode, _FileDataNodeMixin, _TabularDataNodeMixin):
                 if columns:
                     data[key].columns = columns
 
-                df.to_excel(writer, key, index=False, header=self.properties[self._HAS_HEADER_PROPERTY] or None)
+                df.to_excel(writer, key, index=False, header=self.properties[self._HAS_HEADER_PROPERTY] or False)
 
     def _write(self, data: Any):
         if isinstance(data, Dict):