matplotlib
diff --git a/‎lib/matplotlib/artist.py
Copy file name to clipboardExpand all lines: lib/matplotlib/artist.py
+3-2Lines changed: 3 additions & 2 deletions b/‎lib/matplotlib/artist.py
Copy file name to clipboardExpand all lines: lib/matplotlib/artist.py
+3-2Lines changed: 3 additions & 2 deletions
diff --git a/‎lib/matplotlib/backend_bases.py
Copy file name to clipboardExpand all lines: lib/matplotlib/backend_bases.py
+3-1Lines changed: 3 additions & 1 deletion b/‎lib/matplotlib/backend_bases.py
Copy file name to clipboardExpand all lines: lib/matplotlib/backend_bases.py
+3-1Lines changed: 3 additions & 1 deletion
diff --git a/‎lib/matplotlib/backend_tools.py
Copy file name to clipboardExpand all lines: lib/matplotlib/backend_tools.py
+3-1Lines changed: 3 additions & 1 deletion b/‎lib/matplotlib/backend_tools.py
Copy file name to clipboardExpand all lines: lib/matplotlib/backend_tools.py
+3-1Lines changed: 3 additions & 1 deletion
@@ -1059,8 +1059,9 @@ def format_cursor_data(self, data):
             data[0]
         except (TypeError, IndexError):
             data = [data]
-        return ', '.join('{:0.3g}'.format(item) for item in data if
-                isinstance(item, (np.floating, np.integer, int, float)))
+        data_str = ', '.join('{:0.3g}'.format(item) for item in data if
+                   isinstance(item, (np.floating, np.integer, int, float)))
+        return "[" + data_str + "]"
 
     @property
     def mouseover(self):
 
@@ -2898,7 +2898,9 @@ def mouse_move(self, event):
                     if a is not event.inaxes.patch:
                         data = a.get_cursor_data(event)
                         if data is not None:
-                            s += ' [%s]' % a.format_cursor_data(data)
+                            data_str = a.format_cursor_data(data)
+                            if data_str is not None:
+                                s = s + ' ' + data_str
 
                 if len(self.mode):
                     self.set_message('%s, %s' % (self.mode, s))
 
@@ -344,7 +344,9 @@ def send_message(self, event):
                     if a is not event.inaxes.patch:
                         data = a.get_cursor_data(event)
                         if data is not None:
-                            s += ' [%s]' % a.format_cursor_data(data)
+                            data_str = a.format_cursor_data(data)
+                            if data_str is not None:
+                                s = s + ' ' + data_str
 
                 message = s
         self.toolmanager.message_event(message, self)