[Tutor] Explanation of this print statement

[Alan Gauld]

On 08/02/15 23:01, Shawn Byers wrote:
> Hello I was wondering if someone could explain this print statement
>
> for r in range(6,0,-1):
>           print((6-r)*''+r*'o')

Have you tried running it?
Do you see what it is doing?

Try evaluating range(6,0,-1) at the interpreter (you may want to convert 
it to a list) to see what it does.

 >>> print( list(range(6,0,-1)) )

Try substituting values for (6-r) and see what string
results you get for each value.
eg
 >>> print(6 * '' + 0 * 'o')
 >>> print(0 * '' + 6 * 'o')
 >>> print(3 * '' + 3 * 'o')
 >>> print(3 * '' + 4 * 'o')
 >>> etc

In other words, experiment in the >>> interpreter. That's
what it's there for. And its quicker than sending an email
and waiting for a reply (which may not cover the bit you
want to understand anyway).

Then if there's still something you don't understand come
back and ask us about that specific aspect.

-- 
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.amazon.com/author/alan_gauld
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