matplot同时画两条线，代码示例

效果图：



代码：

import matplotlib.pyplot as plt

migtime = [16.6,16.5,16.9,17.1,17.2,18.1,18.2,18.4,19.4,19.3,20.4,20.3,22,21.7,22]
delay = [108,98,92,83,87,77,85,48,31,58,35,43,36,31,19]

fig,ax = plt.subplots()

plt.xlabel('migration speed (MB/s)')
plt.ylabel('migration time (s); request delay (ms)')

"""set interval for y label"""
yticks = range(10,110,10)
ax.set_yticks(yticks)

"""set min and max value for axes"""
ax.set_ylim([10,110])
ax.set_xlim([58,42])

x = [57,56,55,54,53,52,51,50,49,48,47,46,45,44,43]
plt.plot(x,migtime,"x-",label="migration time")
plt.plot(x,delay,"+-",label="request delay")

"""open the grid"""
plt.grid(True)

plt.legend(bbox_to_anchor=(1.0, 1), loc=1, borderaxespad=0.)

plt.show()