Matplotlib suptitle prints over old title
问题内容：
I am trying to use suptitle to print a title, and I want to occationally
replace this title. Currently I am using:
self.ui.canvas1.figure.suptitle(title)
where figure is a matplotlib figure (canvas1 is an mplCanvas, but that is not
relevant) and title is a python string.
Currently, this works, except for the fact that when I run this code again
later, it just prints the new text on top of the old, resulting in a gargeled,
unreadable title.
How do you replace the old suptitle of a figure, instead of just printing
over?
Thanks,
Tyler
问题答案：
figure.suptitle returns a matplotlib.text.Text instance. You can save it
and set the new title:
txt = fig.suptitle('A test title')
txt.set_text('A better title')
plt.draw()
