I did not find out if this is an error or intentional (for any reason) in matplotlib, but in order to get the full legend label, you need to leave a trailing comma in the list of labels:
figlegend((k),('Limit',),loc='lower center')
change this line and your code:
from pylab import * k = plot((0, 1),(1, 1)) figlegend((k),('Limit',),loc='lower center') savefig('test.pdf')
displays the number:

Bftm
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