绘制饼形图

import numpy as np;
import matplotlib.pyplot as plt;

x = [1, 2, 3, 4];
plt.pie(x);
plt.show();

#plt.rcParams['font.family'] = 'SimHei';
#plt.rcParams['axes.unicode_minus']=False;
x = [1, 2, 3, 4];

plt.subplot(121);
plt.title('方式一');
plt.pie(x);

plt.subplot(122);
plt.title('方式二');
plt.pie(x,explode=[0.1,0.2,0.1,0.2]);
plt.show();

略