问如何保存绘图到图像文件中，并且可以不是使用Matplotlib来显示它？

＃做一个正方形的图和轴

figure(1, figsize=(6, 6))

ax = axes([0.1, 0.1, 0.8, 0.8])

labels = 'Frogs', 'Hogs', 'Dogs', 'Logs'

fracs = [15, 30, 45, 10]

explode = (0, 0.05, 0, 0)

pie(fracs, explode=explode, labels=labels, autopct='%1.1f%%', shadow=True)

title('Raining Hogs and Dogs', bbox={'facecolor': '0.8', 'pad': 5})

show()  # Actually, don't show, just save to foo.png