我曾经stem_graphic绘制过茎叶图并将其保存为 pdf 但在尝试输入标题时出现错误：Figure object have no attribute set_title.
ax, b=stem_graphic(mileage['disp'])
ax.set_title("Vicky")
This is the error
Traceback (most recent call last):
File "<pyshell#214>", line 1, in <module>
ax.set_title("Vicky")
AttributeError: 'Figure' object has no attribute 'set_title'