Python怎样实现在同一张图上画两次，python张图上画,如题。Matlab中，执

matplotlib 和 Matlab 差不多，而且不需要 hold on 语句。例如

import matplotlib.pyplot as pltx = range(10)y1 = [elem*2 for elem in x]plt.plot(x, y1)y2 = [elem**2 for elem in x]plt.plot(x, y2, 'r--')plt.show()