我正在为 uni 编写实验室报告，并决定使用 pyplot 为其绘制图表。我的一个轴的单位是 V^(-1)，但在使用代码时，我似乎无法让 matplotlib 用上标的功能来编写它（它只上标减号）：
plt.xlabel('$1/U (10^5 V ^-1 )$')
如果可能的话，我还想将用于轴标题的字体与用于轴上值的字体相匹配。我试过把：
plt.rc('text', usetex=True)
plt.rc('font', family='serif')
在我的代码的开头，但这给了我错误：
File "C:\Users\Sam\Documents\Uni\Labs\pytry.py", line 92, in <module>
plt.savefig("Xrayplot.png")
File "C:\Users\Sam\AppData\Local\Enthought\Canopy\User\lib\site-packages\matplotlib\pyplot.py", line 561, in savefig
return fig.savefig(*args, **kwargs)
File "C:\Users\Sam\AppData\Local\Enthought\Canopy\User\lib\site-packages\matplotlib\figure.py", line 1421, in savefig
self.canvas.print_figure(*args, **kwargs)
File "C:\Users\Sam\AppData\Local\Enthought\Canopy\User\lib\site-packages\matplotlib\backends\backend_wxagg.py", line 85, in print_figure
FigureCanvasAgg.print_figure(self, filename, *args, **kwargs)
File "C:\Users\Sam\AppData\Local\Enthought\Canopy\User\lib\site-packages\matplotlib\backend_bases.py", line 2220, in print_figure
**kwargs)
File "C:\Users\Sam\AppData\Local\Enthought\Canopy\User\lib\site-packages\matplotlib\backends\backend_agg.py", line 505, in print_png
FigureCanvasAgg.draw(self)
File "C:\Users\Sam\AppData\Local\Enthought\Canopy\User\lib\site-packages\matplotlib\backends\backend_agg.py", line 451, in draw
self.figure.draw(self.renderer)
File "C:\Users\Sam\AppData\Local\Enthought\Canopy\User\lib\site-packages\matplotlib\artist.py", line 54, in draw_wrapper …