餅狀圖在統計分析中有著重要的應用，python中用于繪制餅狀圖是matplotlib中的pyplot類，這里就介紹一下，如何繪制餅狀圖。

直接看下面的代碼

""" =============== Basic pie chart ===============Demo of a basic pie chart plus a few additional features.In addition to the basic pie chart, this demo shows a few optional features:* slice labels* auto-labeling the percentage* offsetting a slice with "explode"* drop-shadow* custom start angleNote about the custom start angle:The default ``startangle`` is 0, which would start the "Frogs" slice on the positive x-axis. This example sets ``startangle = 90`` such that everything is rotated counter-clockwise by 90 degrees, and the frog slice starts on the positive y-axis. """ import matplotlib.pyplot as plt# Pie chart, where the slices will be ordered and plotted counter-clockwise: labels = 'Frogs', 'Hogs', 'Dogs', 'Logs' sizes = [15, 30, 45, 10] explode = (0, 0.1, 0, 0) # only "explode" the 2nd slice (i.e. 'Hogs')fig1, ax1 = plt.subplots() ax1.pie(sizes, explode=explode, labels=labels, autopct='%1.1f%%',shadow=True, startangle=90) ax1.axis('equal') # Equal aspect ratio ensures that pie is drawn as a circle.plt.show()
繪制結果如下圖所示：

2017.09.19

總結

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