Matplotlib图例中的文本对齐方式

Question

I am trying to right-align the entries in a matplotlib axes legend (by default they are left-aligned), but can't seem to find any way of doing this. The setup I have is below:

(I have added data and labels to my_fig axes using the ax.plot() command)

ax = my_fig.get_axes()[0]
legend_font = FontProperties(size=10)
ax.legend(prop=legend_font, num_points=1, markerscale=0.5)

There is a list of legend keyword arguments in the docs for matplotlib Axes , but there doesn't seem to be any straighforward way to set the alignment of the legend entries there. Anybody know of a backdoor way of doing this? Thanks.

EDIT:

To clarify what I am trying to achieve, right now my legend looks like:

 Maneuver: 12-OCT-2011 12:00 UTC Bias: 14-OCT-2011 06:00 UTC 

I want it to look like:

 Maneuver: 12-OCT-2011 12:00 UTC Bias: 14-OCT-2011 06:00 UTC 

Answer 1

The backdoor you're looking for is the following:

# get the width of your widest label, since every label will need 
# to shift by this amount after we align to the right
shift = max([t.get_window_extent().width for t in legend.get_texts()])
for t in legend.get_texts():
    t.set_ha('right') # ha is alias for horizontalalignment
    t.set_position((shift,0))

Answer 2

I tried to get the example work, but I couldn't.

At least since matplotlib version 1.1.1 (maybe earlier) we need a dedicated renderer instance. Take care of your backend which defines the renderer. Depending on backend the output may look fine on screen but dismal as PDF.

# get the width of your widest label, since every label will need 
#to shift by this amount after we align to the right
renderer = figure.canvas.get_renderer()
shift = max([t.get_window_extent(renderer).width for t in legend.get_texts()])
for t in legend.get_texts():
    t.set_ha('right') # ha is alias for horizontalalignment
    t.set_position((shift,0))