rewrite comments

Author: charlesdong1991

pandas/io/formats/csvs.py

@@ -212,13 +212,13 @@ def _index_label_encoder(self):
             if isinstance(obj.index, ABCMultiIndex):
                 index_label = []
                 for i, name in enumerate(obj.index.names):
-                    # if index_name is False, index name won't be displayed
+                    # add empty string is name is None
                     if name is None:
                         name = ''
                     index_label.append(name)
             else:
                 index_label = obj.index.name
-                # if index_name is False, index name won't be displayed
+                # if no name, use empty string
                 if index_label is None:
                     index_label = ['']
                 else:
@@ -244,12 +244,11 @@ def _save_header(self):
         has_aliases = isinstance(header, (tuple, list, np.ndarray,
                                           ABCIndexClass))
         if not (has_aliases or header):
-            # if index_label and header are False, nothing will display
+            # if index_label is False, nothing will display.
             if index_label is False:
                 return
             else:
-                # if index_label is not None, index label will be displayed, if
-                # index_label is None, a empty string will be given.
+                # based on index_label value, encoded labels are given
                 index_label, encoded_labels = self._index_label_encoder()
                 encoded_labels.extend([''] * len(obj.columns))
                 writer.writerow(encoded_labels)