More verbosity for debugging

Author: jnothman

pandas/tests/io/test_excel.py

@@ -2410,6 +2410,9 @@ def custom_converter(css):
             writer, sheet_name='custom')
         writer.save()
 
+        import zipfile
+        print(zipfile.ZipFile(path).open('xl/styles.xml').read())
+
         if engine not in ('openpyxl', 'xlsxwriter'):
             # For other engines, we only smoke test
             return