python - matplotlib 饼图的多个图例？

Question

我正在使用 Python 进行编码并测试 Matplotlib。我正在尝试添加多个图例，因为我有 2 个饼图。使用这个http://matplotlib.org/users/legend_guide.html我有 2 个多个图例，但颜色相同。对于每个饼图，我有 2 种不同的颜色，因此我希望它们各自的图例具有相同的颜色。

另外，是否可以将图例放在更靠近窗口边框的位置？因为图例是一个很长的短语，我不希望第二个图例出现在屏幕中间。

import matplotlib.pyplot as plt
import matplotlib.patches as mpatches

#def pieChart()
# Data to plot
labels = 'Participaram', 'Não participaram'
sizes = [215, 130]
colors = ['gold', 'yellowgreen']
explode = (0.1, 0)  # explode 1st slice

labels2 = 'Só visualizam dúvidas alheias', 'Mandaram e visualizam'
sizes2 = [215, 130]
colors2 = ['lightskyblue', 'lightcoral']
explode2 = (0, 0.08)  # explode 1st slice

# Plot
plt.pie(sizes, explode=explode,  colors=colors2,autopct='%1.1f%%', shadow=True, startangle=90, center = (-2,0))

plt.pie(sizes2, explode=explode2,  colors=colors,autopct='%1.1f%%', shadow=True, startangle=45, center = (2,0))

first_legend = plt.legend(labels,loc = 2)
ax = plt.gca().add_artist(first_legend)
second_legend = plt.legend(labels2,loc = 4,ncol=1)

plt.axis('equal')
plt.show()

Answer 1

在图中定义两个轴来分别绘制每个饼图并自动调整使用tight_layout:

import matplotlib.pyplot as plt
import matplotlib.patches as mpatches

#def pieChart()
# Data to plot
labels = u'Participaram', u'Não participaram'
sizes = [215, 130]
colors = ['gold', 'yellowgreen']
explode = (0.1, 0)  # explode 1st slice

labels2 = [u'Só visualizam dúvidas alheias', u'Mandaram e visualizam']
sizes2 = [215, 130]
colors2 = ['lightskyblue', 'lightcoral']
explode2 = (0, 0.08)  # explode 1st slice

fig = plt.figure()
ax1 = fig.add_subplot(121)
ax2 = fig.add_subplot(122)

# Plot
ax1.pie(sizes, explode=explode,  colors=colors2, autopct='%1.1f%%', 
        shadow=True, startangle=90, center = (-2,0))

ax2.pie(sizes2, explode=explode2,  colors=colors,autopct='%1.1f%%', 
        shadow=True, startangle=45, center = (2,0))

first_legend = ax1.legend(labels, loc = 2)
second_legend = ax2.legend(labels2, loc = 2)

ax1.axis('equal')
ax2.axis('equal')
plt.tight_layout()
plt.show()