[Tutor] closing the window through code

[Max Patient]

Hi there
i am preparing for a mock exam using python and was wondering if you can help,
my task is to create apassword checker and one of the criteria is to have a quit option. i have looked and looked but can't seem to find a bit of code allowing to do this!
if there is any way you coild help me it woild be much appreciated 

yours sincerely 
Max Patient

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