DeprecationWarning in 7.4

While using matplotlib 0.74 in Mandrake 10.1, I got the following warning.
Would you tell me how to avoid the warning message? Thanks.

pylab.plot([1,2,3,4])

/usr/lib/python2.3/site-packages/matplotlib/backends/backend_gtk.py:533:
DeprecationWarning:
  getattr(self, callback)
/usr/lib/python2.3/site-packages/matplotlib/backends/backend_gtk.py:523:
DeprecationWarning:
  self.append_space()
/usr/lib/python2.3/site-packages/matplotlib/backends/backend_gtk.py:536:
DeprecationWarning:
  self.append_space()
/usr/lib/python2.3/site-packages/matplotlib/backends/backend_gtk.py:539:
DeprecationWarning:
  self.append_widget(self.message, None, None)
[<matplotlib.lines.Line2D instance at 0x406e674c>]

···

--
Daehyok Shin
Geography Department
University of North Carolina-Chapel Hill
USA