在python上的动画图

Question

我需要从加速度计读取变量并构建图形，但图形不显示。为什么？我的代码需要更改什么？如果我在读取变量之前放置最后2个字符串，图形构建但数据未读取。 求救！

import lightblue
import matplotlib.pyplot as plt
import matplotlib.animation as animation

fig = plt.figure()
ax1 = fig.add_subplot(1, 1, 1)
w = 1
conn = None


def animate(i):
    global conn
    global w, ax
    if w:
        sock = lightblue.socket()
        sock.bind(("", 0))
        sock.listen(1)
        lightblue.advertise("EchoService", sock, lightblue.RFCOMM)
        print "Advertised and listening on channel %d..." % sock.getsockname()[1]
        conn, addr = sock.accept()
        print "Connected by", addr
        w = 0
    line = conn.recv(1024)
    angles = line.split(", ")
    if len(angles) == 3:
            ax = float(angles[0])
            ay = float(angles[1])
            az = float(angles[2])
            print ("ax : " + str(ax))
            print ("ay : " + str(ay))
            print ("az : " + str(az))
            xs = []
            ys = []
            xs.append(ax)
            ys.append(ay)
            ax1.clear()
            ax1.plot(xs, ys)
ani = animation.FuncAnimation(fig, animate)
plt.show()