Fixed pep8 issue

Author: ericmjl

examples/pylab_examples/plotfile_demo.py

@@ -35,7 +35,7 @@
 plt.plotfile(fname2, cols=(0, 1), delimiter=' ')
 plt.plotfile(
     fname2,
-    cols=(0,2),
+    cols=(0,2), 
     newfig=False,
     delimiter=' ')  # use current figure
 plt.xlabel(r'$x$')