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To: python-list@python.org
From: Dave Angel <davea@davea.name>
Subject: Re: beginner question (True False help)
Date: Thu, 8 Aug 2013 01:18:50 +0000 (UTC)
References: <6c6dedec-5e47-4229-bc67-01b058cdb410@googlegroups.com> <7c627d74-a5c5-4356-9a04-9608de0006ba@googlegroups.com>
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eschneider92@comcast.net wrote:

> What I wanted to happen is when the user typed something other than 'y' or 'yes' after being asked 'go again?', the batman==False line would cause the program to stop asking anything and say 'this is the end'. Instead, what is happening is that the program just keeps going. I figured that after defining the function (thingy(), repeat()), that the while statement would repeat until the 'go again' user input was something other than 'y' or 'yes', and the batman==False part of the repeat() function would cause the 'while batman==True' part to become False and end. You probably answered my question and I'm too dumb to see it, but that's a slight elaboration on my problem.

When you assign a variable inside a function, it has no effect on a
global variable with similar name.  In order to make it change the
global, you'd have needed the global declaration.

Try this:

var = 42
def  myfunc():
     var = 90


print "before:", var
myfunc()
print "after:", var

Now, change the function, by adding a declaration:

def myfunc():
    global var
    var = 90

and the result will change.


-- 
DaveA