Line2D handler which lets you tweak the x location of the markers.

handler_xoffset.py

from matplotlib.legend_handler import HandlerLine2D

class HandlerXoffset(HandlerLine2D):
    def __init__(self, marker_pad=0.3, numpoints=1, x_offset=0,  **kw):
        HandlerLine2D.__init__(self, marker_pad=marker_pad, numpoints=numpoints, **kw)
        self._xoffset = x_offset
    def get_xdata(self, legend, xdescent, ydescent, width, height, fontsize):
        numpoints = self.get_numpoints(legend)

        if numpoints > 1:
            # we put some pad here to compensate the size of the
            # marker
            xdata = np.linspace(-xdescent + self._marker_pad * fontsize,
                                width - self._marker_pad * fontsize,
                                numpoints) - self._xoffset
            xdata_marker = xdata
        elif numpoints == 1:
            xdata = np.linspace(-xdescent, width, 2) - self._xoffset
            xdata_marker = [0.5 * width - 0.5 * xdescent - self._xoffset]

        print xdata, self._xoffset
        print xdata_marker

        return xdata, xdata_marker