What's wrong with this code?

Mon Jul 23 11:36:19 EDT 2012

On 7/23/2012 7:50 AM Stone Li said...
> I'm totally confused by this code:
>> Code:
>> a = None
> b = None
> c = None
> d = None
> x = [[a,b],
> [c,d]]
> e,f = x[1]
> print e,f

This prints the first None,None
> c = 1
> d = 2
> print e,f

And nothing has happened to e or f, so this is the second None,None
Why do you expect 1,2?
Emile
> e = 1
> f = 2
> print c,d
>> Output:
>> None None
> None None
> 1 2
>>> I'm expecting the code as:
>> None None
> 1 2
> 1 2
>>> What's wrong?
> And this question made my GUI program totally out of control.
> Thanks
>>