[Tutor] Fwd: Re: Loop in pre-defined blocks

[Alan Gauld]

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> Sorry, to be a little bit more descriptive. I'd like to loop from 1 to 35
> but within this loop there are divisions which I need to prefix that
> particular division number.

> My output would look like this:
>>>>>>>>>>>>>>>
1 1 
1 2 
1 3 
1 4 
1 5 
1 6 
1 7 
1 8 
1 9 
1 10 
1 11 
1 12 
2 13 
2 14 
2 15 
2 16 
2 17 
2 18 
2 19 
2 20 
3 25 
3 26 
3 27 
3 28 
3 29 
3 30 
3 31 
3 32 
3 33 
3 34 
3 35
>>>>>>>>>>>>>>>

You can't specify the blocks as just (12,20,.35) since you are using
non-contiguous blocks - you have a gap between 20 and 25.

So your definition needs to be (1,12),(13,20),(25,35) to specify
the missing rows. But you can arguably simplify the code a little:

blocks = ((1,13),(13,21),(25,36))
for prefix, block in enumerate(blocks):
     for n in range(*block):
          print prefix+1, n

its very similar to your code but using tuple expansion in range()
cleans it up a little bit and the names hopefully make the intent
clearer.

Alan G
Author of the Learn to Program web site
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