python - matplotlib error making a pie chart

Question

{Code...} where def get_friends_rate() returns return [float(male)/total 100, float(female)/total 100, float(other)/total * 100] and an error occurred during operation:

世界只因有你 · Answer

The following source code is used:

>>> from matplotlib import pyplot as plt
>>> sizes = 30,20,50
>>> lables = u'男生比例',u'女生比例',u'其他'
>>> plt.pie(sizes, labels=lables,autopct='%.3f%%', shadow=False, startangle=90)
>>> plt.axis('equal')
>>> plt.show()

Just pass in the labels using the labels parameter. Python2.7 is used to write it here. Since it is in Chinese, there will be a problem that it cannot be displayed.