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Re: Newbie - Trying to Help a Friend

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Date Thu, 21 Nov 2013 15:35:41 -0800
From Gary Herron <gary.herron@islandtraining.com>
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On 11/21/2013 03:17 PM, bradleybooth12345@gmail.com wrote:
> Coming back to the second question
>
> "The collatz process is as follows. Take a positive integer n greater than 1. while n is greater than 1 repeat the following; if N is even halve it and if N is odd multiply it by 3 and add 1. The (Unsolved) collatz conjecture is that this process always terminates.
>
> The user should be prompted to supply the number n, and your program should build the list of values taken by sucessive iteration of the algorithm, and print it out. For example, if 7 is input your program should print the list
>
> [7,22,11,34,17,52,26,13,40,20,10,5,16,8,4,2,1]
>
> We've managed to come up with this, but obviously it's wrong. Any Idea's?
>
> def collatz_sequence (n) :
>        seq = [ ]
>        if n < 1 :
>           return [ ]
>        while n > 1:
>             if n % 2 == 0:
>              n = n/2
>            else:
>               n = 3*n+ 1
>            seq.append (n)
>       return seq

Why  do you say it's wrong?   What does it do?   What was expected?

I see that your indentations don't match, but I can't tell if that's 
your error or an email problem.  Is that the 'obviously wrong' part?

I also see that you create an (apparently correct) function, which 
returns a nice result.  But you haven't called the function to actually 
run it with a specific value to be printed out.  Perhaps that's the  
'obviously wrong' part you refer to.

However, the function itself looks correct otherwise, although you may 
want to start the sequence off with [n] rather than [] so as to match 
the suggested output.

Gary Herron

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Thread

Newbie - Trying to Help a Friend bradleybooth12345@gmail.com - 2013-11-19 10:40 -0800
  Re: Newbie - Trying to Help a Friend maxwell34m@gmail.com - 2013-11-19 11:05 -0800
  Re: Newbie - Trying to Help a Friend Neil Cerutti <mr.cerutti@gmail.com> - 2013-11-19 14:07 -0500
  Re: Newbie - Trying to Help a Friend Gary Herron <gary.herron@islandtraining.com> - 2013-11-19 11:06 -0800
  Re: Newbie - Trying to Help a Friend bradleybooth12345@gmail.com - 2013-11-19 11:27 -0800
    Re: Newbie - Trying to Help a Friend Denis McMahon <denismfmcmahon@gmail.com> - 2013-11-19 20:48 +0000
      Re: Newbie - Trying to Help a Friend Duncan Booth <duncan.booth@invalid.invalid> - 2013-11-20 11:38 +0000
        Re: Newbie - Trying to Help a Friend Denis McMahon <denismfmcmahon@gmail.com> - 2013-11-23 02:03 +0000
    Re: Newbie - Trying to Help a Friend Mark Janssen <dreamingforward@gmail.com> - 2013-11-19 14:51 -0800
  Re: Newbie - Trying to Help a Friend Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-11-20 00:17 +0000
    Re: Newbie - Trying to Help a Friend Dave Angel <davea@davea.name> - 2013-11-19 22:10 -0500
      Re: Newbie - Trying to Help a Friend Steven D'Aprano <steve@pearwood.info> - 2013-11-20 03:52 +0000
        Re: Newbie - Trying to Help a Friend Dave Angel <davea@davea.name> - 2013-11-20 00:54 -0500
          Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 09:29 +0000
            Re: Newbie - Trying to Help a Friend Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-11-20 13:57 +0000
              Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 14:51 +0000
                Re: Newbie - Trying to Help a Friend Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-11-20 18:33 -0500
                Re: Newbie - Trying to Help a Friend Anssi Saari <as@sci.fi> - 2013-11-21 15:44 +0200
              Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 14:49 +0000
                Re: Newbie - Trying to Help a Friend Chris Angelico <rosuav@gmail.com> - 2013-11-21 02:05 +1100
                Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 15:06 +0000
                Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 15:09 +0000
                Re: Newbie - Trying to Help a Friend Chris Angelico <rosuav@gmail.com> - 2013-11-21 02:14 +1100
                Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 15:35 +0000
                Multiple postings Alister <alister.ware@ntlworld.com> - 2013-11-20 15:36 +0000
                Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 15:34 +0000
                Re: Newbie - Trying to Help a Friend Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-11-20 16:29 +0000
                Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 16:45 +0000
                Re: Newbie - Trying to Help a Friend Ned Batchelder <ned@nedbatchelder.com> - 2013-11-20 09:12 -0800
                Re: Newbie - Trying to Help a Friend Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-11-20 17:37 +0000
                Re: Newbie - Trying to Help a Friend Ned Batchelder <ned@nedbatchelder.com> - 2013-11-20 09:51 -0800
                Re: Newbie - Trying to Help a Friend Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-11-20 18:09 +0000
                Re: Newbie - Trying to Help a Friend Ned Batchelder <ned@nedbatchelder.com> - 2013-11-20 10:18 -0800
                Re: Newbie - Trying to Help a Friend Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-11-20 18:35 +0000
                Re: Newbie - Trying to Help a Friend Ned Batchelder <ned@nedbatchelder.com> - 2013-11-20 11:54 -0800
                Re: Newbie - Trying to Help a Friend Chris Angelico <rosuav@gmail.com> - 2013-11-21 07:26 +1100
                Off-topic: Pop culture references [was Re: Newbie - Trying to Help a Friend] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-11-21 00:27 +0000
                Re: Off-topic: Pop culture references [was Re: Newbie - Trying to Help a Friend] MRAB <python@mrabarnett.plus.com> - 2013-11-21 00:48 +0000
                Re: Off-topic: Pop culture references [was Re: Newbie - Trying to Help a Friend] Tim Golden <mail@timgolden.me.uk> - 2013-11-21 09:08 +0000
                Re: Off-topic: Pop culture references [was Re: Newbie - Trying to   Help a Friend] Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2013-11-22 17:10 +1300
                Re: Off-topic: Pop culture references [was Re: Newbie - Trying to Help a Friend] Chris Angelico <rosuav@gmail.com> - 2013-11-21 20:46 +1100
                Re: Newbie - Trying to Help a Friend Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-11-21 12:53 +0100
                Re: Newbie - Trying to Help a Friend Chris Angelico <rosuav@gmail.com> - 2013-11-22 02:48 +1100
                Re: Newbie - Trying to Help a Friend Neil Cerutti <mr.cerutti@gmail.com> - 2013-11-21 11:29 -0500
                Re: Newbie - Trying to Help a Friend Chris Angelico <rosuav@gmail.com> - 2013-11-22 04:10 +1100
                Re: Newbie - Trying to Help a Friend bradleybooth12345@gmail.com - 2013-11-21 15:17 -0800
                Re: Newbie - Trying to Help a Friend Gary Herron <gary.herron@islandtraining.com> - 2013-11-21 15:35 -0800
                Re: Newbie - Trying to Help a Friend bradleybooth12345@gmail.com - 2013-11-21 15:55 -0800
                Re: Newbie - Trying to Help a Friend Terry Reedy <tjreedy@udel.edu> - 2013-11-21 19:55 -0500
                Re: Newbie - Trying to Help a Friend Gary Herron <gary.herron@islandtraining.com> - 2013-11-21 20:17 -0800
                Re: Newbie - Trying to Help a Friend Terry Reedy <tjreedy@udel.edu> - 2013-11-21 19:17 -0500
                Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 15:34 +0000
                Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 15:06 +0000
                Re: Newbie - Trying to Help a Friend Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-11-20 15:24 +0000
              Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 14:50 +0000
              Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 14:50 +0000
          Re: Newbie - Trying to Help a Friend Alister <alister.ware@ntlworld.com> - 2013-11-20 09:29 +0000

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