python如何绘制心形

import matplotlib.pyplot as plt
import numpy as np
#初始化数据
init = np.arange(-np.pi, np.pi, 0.001)
y = np.subtract(np.multiply(2, np.cos(init)), np.cos(np.multiply(2, init)))
x = np.subtract(np.multiply(2, np.sin(init)), np.sin(np.multiply(2, init)))
#画图
plt.plot(x, y)
plt.fill_between(x, y, facecolor='red')
plt.show()