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copied!<p>You should think of the following number split into 3-sized chunks:</p> <pre><code>1000005 -> 100 000 5 </code></pre> <p>You have two problems. The first is that if you put those <em>integers</em> back together, you'll get:</p> <pre><code>100 0 5 -> 100005 </code></pre> <p>(i.e., the middle one is 0, not 000) which is not what you started with. Second problem is that you're not sure what size the last part should be.</p> <p>I would ensure that you're first using a string whose length is an exact multiple of the part size so you know <em>exactly</em> how big each part should be:</p> <pre><code>def split_number (num, part_size): string = str(num) string_size = len(string) while string_size % part_size != 0: string = "0%s"%(string) string_size = string_size + 1 arr = [] pointer = 0 while pointer < string_size: e = pointer + part_size arr.append(int(string[pointer:e])) pointer += part_size return arr </code></pre> <p>Secondly, make sure that you put the parts back together with the right length for each part (ensuring you don't put leading zeros on the first part of course):</p> <pre><code>def join_number(arr, part_size): fmt_str = "%%s%%0%dd"%(part_size) num = arr[0] for x in arr[1:]: num = fmt_str%(num,int(x)) return int(num) </code></pre> <p>Tying it all together, the following complete program:</p> <pre><code>#!/usr/bin/python def split_number (num, part_size): string = str(num) string_size = len(string) while string_size % part_size != 0: string = "0%s"%(string) string_size = string_size + 1 arr = [] pointer = 0 while pointer < string_size: e = pointer + part_size arr.append(int(string[pointer:e])) pointer += part_size return arr def join_number(arr, part_size): fmt_str = "%%s%%0%dd"%(part_size) num = arr[0] for x in arr[1:]: num = fmt_str%(num,int(x)) return int(num) x = 1000005 print x y = split_number(x,3) print y z = join_number(y,3) print z </code></pre> <p>produces the output:</p> <pre><code>1000005 [1, 0, 5] 1000005 </code></pre> <p>which shows that it goes back together.</p> <p>Just keep in mind I haven't done Python for a few years. There's almost certainly a more "Pythonic" way to do it with those new-fangled lambdas and things (or whatever Python calls them) but, since your code was of the basic form, I just answered with the minimal changes required to get it working. Oh yeah, and be wary of negative numbers :-)</p>

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