My problem is that when I plot y-values that are very close, matplotlib uses a bias for the yticklabel as seen in the picture below (+1.2 in the top left corner). 
I don’t want the bias as it does not reduce the length of the yticklabels. How can I remove the bias, so that it shows 1.2000010, 1.2000012…
Here is the code I used to generate the example:
from pylab import *
plot((0,1),(1.200001,1.200002))
show()
The easiest (and probably preferred) way of achieving this using the pyplot interface is using the supplied function
pyplot.ticklabel_formatin a way analogous toThe other proposed solutions give you more direct control, though.