Quit function in python program -


I have a program that runs in python, without a console (which is to say, I use it py2exe Is compiled). I want people to get out of the main menu, or from a particular key-in-game (e.g., Shift + Q). I'm running it, for now, in Windows, though I'm working on the Linux / Mac version compilation. I think if a 'loop' is going on, and it closes correctly, then The X works by pressing the button, otherwise it seems that stop waiting until the current command closes 'Store'.

Menu options, I have seen well through the document and the Stakeoverflow and have tried to quit (), exit (), sys.exit () and every combination I can find, but Every time I get: 

  Traceback (the most recent call final): File "Alfaith Yu Y", line 61177, & lt; Module & gt; Error in the file "alphatime.pyw", line 53970, place_menu: Global name 'sys' is not defined

If I try sys.exit, and after that: 

  traceback (most recent call final): file "alphatime.pyw", line 61177, & lt; Module & gt; Error in the file "alphatime.pyw", line 53970, place_menu: Global name 'left' is not defined

If I just try "quit" Need to shut down has heard things about 'installation', but I'm not telling the meaning (I am new in Python) and how I will do it.

So, my question is two times.

First of all, can I put in the loop to identify some such things that 'X' can be clicked and closed?

Second, is there a proper command that will close the program? I do not understand why these orders do not work, and I had a lot of complaints from people who used the program, who crashed it, or ctrl-alt-del, or whatever I believe 

  try import: Excluding os._exit (return_code) will work: pass

but at this time, I'm not sure I 'd enable enough on the python to deploy it properly thanks in advance!

You did it at any time 

  import sys  
 Because it should work!

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