2.0 Examples fixes. See matplotlib#6762

These are fixes for all issues found in axes_grid, color, and
event_handling sections on the examples page.

axisartist/demo_curvelinear_grid.py - Set linewidth=2.0 and grid zorder=0 so
the plotted lines actually visible

event_handling/keypress_demo.py - added usage instruction as axes title

event_handling/lasso_demo.py - added usage instruction as axes title

event_handling/looking_glass.py - added usage instruction as axes title

event_handling/resample.py - removed gtk and hardcoded wave file dependencies
and just created a sample signal within the script

event_handling/trifinder_event_demo.py - zip(l1,l2) call changed to
list(zip(l1,l2)) to be python3 compatible

event_handling/viewlims.py - The focus box that is supposed to appear in the
left axes when user zooms in the right axes wasn't visible. Set linewidth=1.0

Author: mlub

examples/axes_grid1/demo_colorbar_with_inset_locator.py

@@ -9,7 +9,7 @@
                     height="5%",  # height : 50%
                     loc=1)
 
-im1 = ax1.imshow([[1, 2], [2, 3]], interpolation='bilinear')
+im1 = ax1.imshow([[1, 2], [2, 3]])
 plt.colorbar(im1, cax=axins1, orientation="horizontal", ticks=[1, 2, 3])
 axins1.xaxis.set_ticks_position("bottom")
 
@@ -26,7 +26,7 @@
 # of the legend.  you may want to play with the borderpad value and
 # the bbox_to_anchor coordinate.
 
-im = ax2.imshow([[1, 2], [2, 3]], interpolation='bilinear')
+im = ax2.imshow([[1, 2], [2, 3]])
 plt.colorbar(im, cax=axins, ticks=[1, 2, 3])
 
 plt.draw()

examples/axes_grid1/simple_axesgrid.py

@@ -12,6 +12,6 @@
                  )
 
 for i in range(4):
-    grid[i].imshow(im, interpolation='bilinear')  # The AxesGrid object work as a list of axes.
+    grid[i].imshow(im)  # The AxesGrid object work as a list of axes.
 
 plt.show()

examples/event_handling/looking_glass.py

@@ -12,6 +12,7 @@
 line, = ax.plot(x, y, alpha=1.0, clip_path=circ)
 ax.set_title("Left click and drag to move looking glass")
 
+
 class EventHandler(object):
     def __init__(self):
         fig.canvas.mpl_connect('button_press_event', self.onpress)

examples/event_handling/resample.py

@@ -32,20 +32,18 @@ def update(self, ax):
             ax.figure.canvas.draw_idle()
 
 # Create a signal
-xdata = np.linspace(16,365,365-16)
-ydata = np.sin(2*np.pi*xdata/153) + np.cos(2*np.pi*xdata/127);
+xdata = np.linspace(16, 365, 365-16)
+ydata = np.sin(2*np.pi*xdata/153) + np.cos(2*np.pi*xdata/127)
 
 d = DataDisplayDownsampler(xdata, ydata)
 
 fig, ax = plt.subplots()
 
 # Hook up the line
-d.line, = ax.plot(xdata, ydata,'o-')
+d.line, = ax.plot(xdata, ydata, 'o-')
 ax.set_autoscale_on(False)  # Otherwise, infinite loop
 
 # Connect for changing the view limits
 ax.callbacks.connect('xlim_changed', d.update)
 
 plt.show()
-
-