some curves not legended

Hi the list, Is it possible to have some curves not legended

    > ?


Help on function legend in module matplotlib.pylab:

legend(*args, **kwargs)
    LEGEND(*args, **kwargs)

    Place a legend on the current axes at location loc. Labels are a
    sequence of strings and loc can be a string or an integer
    specifying the legend location


      Make a legend with existing lines

       >>> legend()

      legend by itself will try and build a legend using the label
      property of the lines/patches/collections. You can set the
      label of a line by doing plot(x, y, label='my data') or
      line.set_label('mydata'). If label is set to '_nolegend_', the
      item will not be shown in legend.