推荐两个非常好的博客内容：
Python实现可视化（二）--label字体大小调整、图例设置https://blog.csdn.net/weixin_39602776/article/details/111314454Python绘制饼图调节字体大小、防止标签重叠解决方法 https://www.cnblogs.com/mengxiaoleng/p/12804117.html然后是我自己的饼图代码，里面用到了字体大小调整这部分的功能：
import matplotlib
import matplotlib.pyplot as plt
matplotlib.rcParams['backend'] = 'SVG'
A=[15.8,0.6,0.0296]
labels='','',''
sizes=A[0],A[1],A[2]
explode=0.05,0.1,0.15
colors='skyblue','gold','green'
fig,ax = plt.subplots(figsize=(13,7)) #创建大小为（14，7）的画布，同时创建一个axes，把axes赋值给ax
patches,l_text,p_text=ax.pie(sizes,explode=explode,labels=labels,
colors=colors,autopct='%1.1f%%',shadow=False,startangle=50)
# ax.set_title('FEMM Loss percentage',fontsize=18)
ax.legend(labels = ['conductor 1','conductor 2','others'],loc=2,fontsize=14)
ax.set_aspect('equal')
for t in p_text:
t.set_size(15)
