# Paste your code here
#Demonstration using the Agg backend, but this also happened for me with others.
import matplotlib
matplotlib.use('agg')
from matplotlib import pyplot as plt

# Some data I found that triggered this bug
x = [100,200,300,400,500,600,700,800,900,1000]
y = [ 1.7,  1.2,  0.98,  0.87,  0.76, 0.69,  0.62,  0.59,  0.56,  0.51]

#Only seems to happen for a log axis.  Same error if you do semilogy
plt.loglog(x, y)
#This does not seem to replace the old tick labels, just add new ones
plt.yticks([0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 2.0], ["0.5", "0.6", "0.7", "0.8", "0.9", "1.0", "2.0"])
plt.savefig("test.png")