[Matplotlib-users] axvspan/axhspan doesn't understand keyword arguments

[Sara H. <sar...@gm...>]

I ran into a little problem when adding an axis span (both vertical and
horizontal) to my plot. When I use the optional keyword arguments, I get an
error message:

import pylab
pylab.axhspan(0.25, 0.75, facecolor='0.5', alpha=0.5)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/lib/python2.5/site-packages/matplotlib/pyplot.py", line 1572, in
axhspan
    ret =  gca().axhspan(*args, **kwargs)
  File "/lib/python2.5/site-packages/matplotlib/axes.py", line 2883, in
axhspan
    self._process_unit_info( [xmin, xmax], [ymin, ymax], **kwargs )
TypeError: _process_unit_info() got an unexpected keyword argument 'alpha'

Granted, I can get the results I want using the .set_xxx() methods, but my
first method should have worked, right?

I've never filed a bug for matplotlib before, so I figured I'd send out an
email to the users-group first.

Thanks,
Sara