You have plotted three lines, but only provided legend labels for two of 
them.  Try:

plt.legend(('Model length', 'Data length', 'Something else'),
             'best', shadow=True, fancybox=True)


Mike

On 08/24/2010 06:33 AM, xyz wrote:
> Hello,
> the following script creates a legend for only two instead of three
> datasets.
> -----------
> from pylab import *
> import matplotlib.pyplot as plt
>
> fig = plt.figure()
> ax = fig.add_subplot(111)
>
> for i in [[2,2], [2,3], [4.2,3.5]]:
>     print i[0],i[1]
>     plt.plot(i[0],i[1],'o')
>
> ax.grid(True)
> plt.legend(('Model length', 'Data length'),
>              'best', shadow=True, fancybox=True)
>
> plt.show()
> -----------------
>
> What did I wrong.
>
> Thank you in advance.
>
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-- 
Michael Droettboom
Science Software Branch
Space Telescope Science Institute
Baltimore, Maryland, USA


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