title: Python installation and setting error
body: <p>I follow official document that directs installation and setting of Python 3.5 in Windows7. However, i couldn't initiate my python study and was blocked by either NameError or SyntaxError, they look like:
  <a href="https://i.stack.imgur.com/Ki5wv.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Ki5wv.png" alt="enter image description here"></a></p>
  
  <p>Working environment is Window7 64bit. And here is how i set my python path:
  <a href="https://i.stack.imgur.com/in19o.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/in19o.png" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/fXJlX.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fXJlX.png" alt="enter image description here"></a></p>
  
  <p>Are there anything wrong with my setting commands? Or am i using the incorrect version? Thanks for help.</p>