ValueError: Format 'jpg' is not supported (supported formats: eps, pdf, pgf, png, ps, raw, rgba, svg

出错的程序源代码：

看到这个源代码，大家应该疑惑了吧，这是对的啊！！！！

但是报错了：

D:\PycharmProjects\python_project\venv\Scripts\python.exe D:/PycharmProjects/python_project/matplotlib/04绘制一元二次方程曲线.py
Traceback (most recent call last):
  File "D:/PycharmProjects/python_project/matplotlib/04绘制一元二次方程曲线.py", line 11, in <module>
    plt.savefig('result.jpg')
  File "D:\PycharmProjects\python_project\venv\lib\site-packages\matplotlib\pyplot.py", line 729, in savefig
    res = fig.savefig(*args, **kwargs)
  File "D:\PycharmProjects\python_project\venv\lib\site-packages\matplotlib\figure.py", line 2180, in savefig
    self.canvas.print_figure(fname, **kwargs)
  File "D:\PycharmProjects\python_project\venv\lib\site-packages\matplotlib\backend_bases.py", line 2023, in print_figure
    canvas = self._get_output_canvas(format)
  File "D:\PycharmProjects\python_project\venv\lib\site-packages\matplotlib\backend_bases.py", line 1965, in _get_output_canvas
    .format(fmt, ", ".join(sorted(self.get_supported_filetypes()))))
ValueError: Format 'jpg' is not supported (supported formats: eps, pdf, pgf, png, ps, raw, rgba, svg, svgz)

Process finished with exit code 1

这是什么原因呢？原来啊，是我们少安装了一个pillow模块！！！！！！！

解决方案是：安装这个模块，再执行即可。

执行的安装模块指令：pip install pillow -i https://pypi.tuna.tsinghua.edu.cn/simple

如此便可以成功了！！！如图为安装指令执行成功：

最后程序执行成功！！