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HomeBackend DevelopmentPython TutorialExample of how python uses the matplotlib library to draw a pie chart

Python强大的原因之一就在于其开源,有很多优秀的程序员为其提供了丰富的类库。Matplotlib就是其中之一,下面这篇文章主要介绍了python如何利用matplotlib库绘制饼图的方法示例,有需要的朋友们可以参考借鉴,下面来一起看看吧。

介绍

matplotlib 是python最著名的绘图库,它提供了一整套和matlab相似的命令API,十分适合交互式地进行制图。而且也可以方便地将它作为绘图控件,嵌入GUI应用程序中。

它的文档相当完备,并且 Gallery页面 中有上百幅缩略图,打开之后都有源程序。因此如果你需要绘制某种类型的图,只需要在这个页面中浏览/复制/粘贴一下,基本上都能搞定。

这篇文章给大家主要介绍了python用matplotlib绘制饼图的方法,话不多说,下面来看代码。

示例代码


import matplotlib.pyplot as plt

# The slices will be ordered and plotted counter-clockwise.
labels = 'Frogs', 'Hogs', 'Dogs', 'Logs'
sizes = [15, 30, 45, 10]
colors = ['yellowgreen', 'gold', 'lightskyblue', 'lightcoral']
explode = (0, 0.1, 0, 0) # only "explode" the 2nd slice (i.e. 'Hogs')

plt.pie(sizes, explode=explode, labels=labels, colors=colors,
  autopct='%1.1f%%', shadow=True, startangle=90)

# Set aspect ratio to be equal so that pie is drawn as a circle.
plt.axis('equal')


plt.savefig('D:\\pie.png')
plt.show()


结果

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