[Matplotlib-users] why legend does not show in matplotlib-1.2.1 & py2.7

[oyster <lep...@gm...>]

the following code runs ok with py2.4 and matplotlib.0.98.3
however no legend appears with py2.7.3 and matplotlib-1.2.1/1.3. and I get
[quote]
e:\prg\py\python-2.7.3\lib\site-packages\_matplotlib\matplotlib\legend.py:629: U
serWarning: Legend does not support [<matplotlib.patches.Wedge object at 0x03842
0F0>, <matplotlib.patches.Wedge object at 0x03842530>, <matplotlib.patches.Wedge
 object at 0x03842930>, <matplotlib.patches.Wedge object at 0x03842D30>, <matplo
tlib.patches.Wedge object at 0x038B0150>]
Use proxy artist instead.

http://matplotlib.sourceforge.net/users/legend_guide.html#using-proxy-artist

  (str(orig_handle),))
e:\prg\py\python-2.7.3\lib\site-packages\_matplotlib\matplotlib\legend.py:629: U
serWarning: Legend does not support [<matplotlib.text.Text object at 0x03842310>
, <matplotlib.text.Text object at 0x03842750>, <matplotlib.text.Text object at 0
x03842B50>, <matplotlib.text.Text object at 0x03842F50>, <matplotlib.text.Text o
bject at 0x038B0370>]
Use proxy artist instead.

http://matplotlib.sourceforge.net/users/legend_guide.html#using-proxy-artist

  (str(orig_handle),))
[/quote]

what's the matter? thanks

[code]
#coding=utf-8
from pylab import *

val2010 = [2, 10, 20, 15, 3]

figure()

pie2010=pie(val2010, labels=[u'%i persons' % i for i in val2010])

plt.legend( (pie2010), [u'<60', u'60~70', u'70~80', u'80~90',
u'90~100'], loc = 'best', bbox_to_anchor = (0.90, 0.75) )
axis('equal')

show()
[/code]