title: Syntax error whenever i try to use sys.stderr
body: <p>I've got a problem using the standard error, whenever I try to use it my computer gives me a syntax error which i can't explain.</p>
  
  <p>So this is my code:</p>
  
  <pre><code>import sys
  
  def main(argv):
  if len(argv) != 3:
      print("Usage: python walk.py n l", file=sys.stderr)
  else:
      l = argv[2]
      n = argv[1]
      print("You ended up", simuleer(n,l), "positions from the starting point.")
  
  
  
  if __name__ == "__main__":
  main(sys.argv)
  </code></pre>
  
  <p>And this is my error</p>
  
  <pre><code>MacBook-Air-van-Luuk:documents luuk$ python walk.py 5 1 2
  File "walk.py", line 21
  print("Usage: python walk.py n l", file=sys.stderr)    
                                         ^
  </code></pre>
  
  <p>I hope someone can explain me why this happens, thanks in advance!</p>