Newbie question
Tim Peters
tim_one at email.msn.com
Mon Jul 26 22:13:32 EDT 1999
[Arnaldo]
> I'm just trying out some examples from the book Learning Python and I run
> into a exercise that is not working for me.
> It's on page 95 , exercise 4b.
> This is the answer the book has
> ===========================================
> l = [1, 2, 4, 8, 16, 32, 64]
> x = 5
> i = 0
> while i < len(l):
> if 2 ** x == l[i]:
> print 'at index', i
> break
> i = i + 1
> else:
> print x , 'not found'
> ============================================
>
> When I run this , python hangs. When I do Ctrl-c , this is what I get
> Traceback (inntermost last):
> File "powera.py, line 5, in ?
> if 2 ** x == l[i]:
>
> What am I doing wrong?
What do you *think* could be going wrong? The program appears to be running
forever. How could that happen? Even if 2**x==l[i] is never true, the loop
is supposed to end as soon as "i < len(l)" is false. So how can "i <
len(l)" always be true?
Bad hint: The code above is not the answer the book gives -- although it's
close.
an-hour-of-thinking-will-save-10-seconds-of-reading<wink>-ly y'rs - tim
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