Modify tick label text

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I want to make some modifications to a few selected tick labels in a plot.

For example, if I do: 

label = axes.yaxis.get_major_ticks()[2].label
label.set_fontsize(size)
label.set_rotation('vertical')

the font size and the orientation of the tick label is changed.

However, if try:

label.set_text('Foo')

the tick label is not modified. Also if I do:

print label.get_text()

nothing is printed.

Here’s some more strangeness. When I tried this:

 from pylab import *
 axes = figure().add_subplot(111)
 t = arange(0.0, 2.0, 0.01)
 s = sin(2*pi*t)
 axes.plot(t, s)
 for ticklabel in axes.get_xticklabels():
     print ticklabel.get_text()

Only empty strings are printed, but the plot contains ticks labeled as ‘0.0’, ‘0.5’, ‘1.0’, ‘1.5’, and ‘2.0’.

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