Some small stylistic changes as per comments from BR.

Author: dhyams

examples/event_handling/test_mouseclicks.py

@@ -2,14 +2,14 @@
 import matplotlib
 #matplotlib.use("WxAgg")
 #matplotlib.use("TkAgg")
-matplotlib.use("GTKAgg")
+#matplotlib.use("GTKAgg")
 #matplotlib.use("QtAgg")
 #matplotlib.use("Qt4Agg")
+#matplotlib.use("CocoaAgg")
+#matplotlib.use("MacOSX")
 import matplotlib.pyplot as plt
-import math
-import numpy
 
-print "***** TESTING WITH BACKEND: %s"%matplotlib.get_backend() + " *****"
+#print "***** TESTING WITH BACKEND: %s"%matplotlib.get_backend() + " *****"
 
 def OnClick(event):
    if event.dblclick:
@@ -25,9 +25,7 @@ def OnRelease(event):
 cid_up = fig.canvas.mpl_connect('button_press_event',OnClick)
 cid_down = fig.canvas.mpl_connect('button_release_event',OnRelease)
 
-t = numpy.arange(0.0,3.0,0.01)
-s = numpy.sin(2*math.pi*t)
-plt.plot(t,s)
+plt.gca().text(0.5,0.5,"Click on the canvas to test mouse events.",ha="center",va="center")
 
 plt.show()
 

lib/matplotlib/backends/backend_cocoaagg.py

@@ -166,7 +166,7 @@ def windowDidResize_(self, sender):
         self.updatePlot()
 
     def mouseDown_(self, event):
-        dblclick = True if event.clickCount() == 2 else False 
+        dblclick = (event.clickCount() == 2)
         loc = self.convertPoint_fromView_(event.locationInWindow(), None)
         type = event.type()
         if (type == NSLeftMouseDown):

lib/matplotlib/backends/backend_gtk.py

@@ -248,8 +248,7 @@ def button_press_event(self, widget, event):
         x = event.x
         # flipy so y=0 is bottom of canvas
         y = self.allocation.height - event.y
-        if (event.type == gdk._2BUTTON_PRESS): dblclick=True
-        else: dblclick=False
+        dblclick = (event.type == gdk._2BUTTON_PRESS)
         FigureCanvasBase.button_press_event(self, x, y, event.button, dblclick=dblclick, guiEvent=event)
         return False  # finish event propagation?