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Fall 2006 Midterm 1 Review: Tracing the printing

Questions?
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walrus
4
Why is it a 4? Earlier we set value = 0, then later we set value = value +1, so that would be 0+1 = 1, right? I understand the for loop loops 4 times, but how does that change the value?
Ok. So Value starts out at 0. What happens to the value of value after each time through the for loop? -Albert d'Heurle
what in the world does x mean in for x in list1
Its just a more fancy way of writing a 'for' loop. 
list1 = range(1,5)
The above line means that 
list1 = [1, 2, 3, 4]
Now the 'for' loop just goes through every value in the list. In short, its the same thing as writing 
for x in range(1,5):
- Bobby Mathew

why isn't list 1= [1,2,3,4,5]?
That's just the way that range is defined. It goes from the first value up to but not including the second value, so range(1,5) excludes 5 from the list. There is an obscure justification that makes this useful in some situations, but mostly it's a pain that causes programming errors until you get used to it. Every programming language contains gotchas like this. Python has fewer than most. Colin Potts


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