Accessing Keyboard Input in Webots

I am attempting to modify the controller file highway_overtake.py in order to access keyboard inputs from the user. After following the documentation, the relevant code appears as follows:

from Controller import Keyboard
keyboard = Keyboard();
keyboard.enable(50);
....
[other webots controller logic]
while driver.step () != -1
     key = keyboard.getKey( )
     if(key ==Keyboard.CONTROL+ord('M')):
          print 'Key Pressed'

I believe this is following the documentation verbatim, and have tried modifying the example with various different key inputs. How should I proceed?

Referenced Documentation: https://www.cyberbotics.com/doc/reference/keyboard

I don't know whats wrong with your code but, here is how you can take input from keyboard in webots:

from controller import Keyboard

timestep = int(robot.getBasicTimeStep())

keyboard=Keyboard()
keyboard.enable(timestep)

while robot.step(timestep) != -1:
    key=keyboard.getKey()
    if (key==Keyboard.CONTROL+ord('M')):
        print ('Ctrl+M is pressed')
#here you get print only when you press ctrl and m togather
#in webots ctrl + B is a shortcut which mess the window layouts thats why i changed B to M 
# hope it helps