title: NameError: name 'true' is not defined
body: <p>I want to use Boolean ( true / false ) in my python source file, but after running the application, I receive the following error:</p>
  <pre><code>NameError: name 'true' is not defined
  </code></pre>
  <p>The error lies on <code>while true:</code>, when I am trying to make the Raspberry Pi run a HTML script when it receives input on port 17:</p>
  <pre><code>import RPi.GPIO as GPIO
  import time
  import os
  
  inputSignal = 17
  GPIO.setmode(GPIO.BCM)
  GPIO.setup(inputSignal,GPIO.IN)
  
  while true:
      if (GPIO.input(inputSignal)):
          os.system(&quot;html /home/pi/index.html&quot;)
      else:
          print(&quot;No Input&quot;)
  </code></pre>