import matplotlib.pyplot as plt

labels = ['Frogs','Hogs','Dogs','Logs']
sizes = [15,30,45,10]

explode = [0,0,0.1,0]

fig1,ax1 = plt.subplots()
ax1.pie(sizes,explode=explode,labels=labels,autopct='%1.1f%%',shadow=True,startangle=30)

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