Plotting streaming data in Python

import serial #import serial lib
import numpy  #import numpy lib for array operations
import matplotlib.pyplot as plt #import matplotlib
from drawnow import *

arduinoSerialData = serial.Serial('COM6',9600)
plt.ion() #Tell matplotlib you want interactive mode to plot live data

data1Array=[]   #Data Arrays to be plotted are initialized
data2Array=[]   #Data Arrays to be plotted are initialized
cnt=0

def makeFig():
    plt.ylim(0,25)             #stop autoscaling by defining limits as: min.=-1 and max.=25
    plt.plot(data1Array, 'ro-', label='data1')   #plot in red color and dots connected by line
    plt.title('Streaming Serial data')
    plt.ylabel('Sawtooth data 1')
    plt.legend(loc='upper left')
    plt2=plt.twinx()
    plt2.plot(data2Array,'b^-', label='data2')
    plt.ylim(0,25)
    plt2.legend(loc='upper right')
    plt2.set_ylabel('Sawtooth data 2')
    plt2.ticklabel_format(useOffset=False)  #Tell matplotlib not to autoscale


while True:
    while (arduinoSerialData.inWaiting() == 0): #Wait until data is there
        pass
    arduinoString = arduinoSerialData.readline();
    #print arduinoString
    dataArray = arduinoString.split(',') #split the string at the comma
    data1 = float(dataArray[0])
    data2 = float(dataArray[1])
    data1Array.append(data1)
    data2Array.append(data2)
    #print data1, ",", data2
    cnt=cnt+1                   #Wait for the first 50 data to get accumulated
    if(cnt>50):
        data1Array.pop(0)       #Pop out the oldest data from the array to plot only 50 latest data
        data2Array.pop(0)
    drawnow(makeFig)
    plt.pause(0.000001)
   

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