AFM.stepper_approach should only call figure.show if it exits.

For example, figures generated with the Agg backend don't have a
'show' method.

diff --git a/pyafm/afm.py b/pyafm/afm.py
index fc8dacbefc4f3d8e37c2776241e3206e6016b7dd..60741c63590615959b471298d7d041aa4dc3c368 100644 (file)
--- a/pyafm/afm.py
+++ b/pyafm/afm.py
@@ -486,7 +486,8 @@ class AFM (object):
             axes.set_title('stepper approach {}'.format(timestamp))
             plot = axes.plot(position, deflection, 'b.-')
             figure.canvas.draw()
-            figure.show()
+            if hasattr(figure, 'show'):
+                figure.show()
             if not _matplotlib.is_interactive():
                 _matplotlib_pyplot.show()