how do i fix this problem - IndentationError?

[carloszoom3000]

Hi,

Same error on the following code:

import serial #seria lib
import numpy #numpy lib
import matplotlib.pyplot as plt #matplot lib
from drawnow import *

arduinoData = serial.Serial('com20', 9600)


while True: #loops forever
     while (arduinoData.inWaiting()==0): #Wait for data
        pass #does nothing
    arduinoString = arduinoData.readline()
    print (arduinoString)

Please help.
I tried adding an argument to arduinoData.readline(0)
same error on same line.