final style fixes

Author: yanxinc

lib/matplotlib/backend_bases.py

@@ -3016,25 +3016,24 @@ def _nonrect(self, x):
 
     def _tooltip_list(self, event, hover):
         import matplotlib.pyplot as plt
-        if event.xdata and event.ydata:
-            lines = plt.gca().get_lines()
-            num_of_points = 0
+        lines = plt.gca().get_lines()
+        num_of_points = 0
+        for line in lines:
+            num_of_points += 1
+        if num_of_points >= len(hover):
+            raise ValueError("""Number of data points
+            does not match up with number of labels""")
+        else:
+            mouse_x = event.xdata
+            mouse_y = event.ydata
             for line in lines:
-                num_of_points += 1
-            if num_of_points >= len(hover):
-                raise ValueError("""Number of data points
-                does not match up with number of labels""")
-            else:
-                mouse_x = event.xdata
-                mouse_y = event.ydata
-                for line in lines:
-                    x_data = line.get_xdata()
-                    y_data = line.get_ydata()
-                    for i in range(len(x_data)):
-                        distance = ((event.xdata - x_data[i])**2
-                                    + (event.ydata - y_data[i])**2)**0.5
-                        if distance < 0.05:
-                            return "Data Label: " + hover[i]
+                x_data = line.get_xdata()
+                y_data = line.get_ydata()
+                for i in range(len(x_data)):
+                    distance = ((event.xdata - x_data[i])**2
+                                + (event.ydata - y_data[i])**2)**0.5
+                    if distance < 0.05:
+                        return "Data Label: " + hover[i]
 
     def mouse_move(self, event):
         self._update_cursor(event)

lib/matplotlib/tests/test_toolkit.py

@@ -4,14 +4,11 @@
 matplotlib.use('tkagg')
 
 fig, ax = plt.subplots()
-plt.ylabel('some numbers')
 
 
 def user_defined_function(event):
-    if event.xdata and event.ydata:
-        x, y = round(event.xdata * 10, 1), round(event.ydata + 3, 3)
-        return f'({x}, {y})'
-    return ''
+    x, y = round(event.xdata * 10, 1), round(event.ydata + 3, 3)
+    return f'({x}, {y})'
 
 
 ax.plot(rand(100), 'o', hover=user_defined_function)
@@ -21,7 +18,6 @@ def user_defined_function(event):
 # Alternative test for testing out string literals as tooltips:
 
 fig, ax = plt.subplots()
-plt.ylabel('some numbers')
 
 ax.plot(rand(3), 'o', hover=['London', 'Paris', 'Barcelona'])
 plt.show()