pep8 chagnes on nan_test.py

Author: ericmjl

examples/pylab_examples/nan_test.py

@@ -5,7 +5,7 @@
 import matplotlib.pyplot as plt
 
 t = np.arange(0.0, 1.0 + 0.01, 0.01)
-s = np.cos(2*2*np.pi*t)
+s = np.cos(2 * 2 * np.pi * t)
 t[41:60] = np.nan
 
 plt.subplot(2, 1, 1)