Update format.py

Removed trailing whitespace

Author: TomAugspurger

pandas/io/formats/format.py

@@ -1132,8 +1132,8 @@ def write_tr(self, line, indent=0, indent_delta=4, header=False,
         self.write('</tr>', indent)
 
     def write_style(self):
-        # We use the "scoped" attribute here so that the desired 
-        # style properties for the data frame are not then applied 
+        # We use the "scoped" attribute here so that the desired
+        # style properties for the data frame are not then applied
         # throughout the entire notebook.
         template_first = """\
             <style scoped>"""