# Paste your code here#Demonstration using the Agg backend, but this also happened for me with others.importmatplotlibmatplotlib.use('agg')frommatplotlibimportpyplotasplt# Some data I found that triggered this bugx= [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 semilogyplt.loglog(x,y)#This does not seem to replace the old tick labels, just add new onesplt.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")