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POWriting numbers from 0 to 1000000000
 

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    <p>I am trying to write a list of the numbers from 0 to 1000000000 as strings, directly to a text file. I would also like each number to have leading zeros up to ten digit places, e.g. <code>0000000000, 0000000001, 0000000002, 0000000003, ... n.</code> However I find that it is taking much too long for my taste. </p> <p>I can use <code>seq</code>, but there is no support for leading zeros and I would prefer to avoid using <code>awk</code> and other auxiliary tools to handle these tasks. I am aware of dramatic speed-up benefits just from coding this in C, but I don't want to resort to it. I was considering mapping some functions to a large list and executing them in a loop, however I only have 2GB of RAM available, so please keep this in mind when approaching my problem. </p> <p>I am using <a href="http://code.google.com/p/python-progressbar/" rel="nofollow">Python-Progressbar</a>, and I am getting an ETA of approximately 2 hours. I would appreciate it if someone can offer me some advice as to how to approach this problem:</p> <pre><code>pbar = ProgressBar(widgets=[Percentage(), Bar(), ' ', ETA(), ' ', FileTransferSpeed()], maxval=1000000000).start() with open('numlistbegin','w') as numlist: limit, nw, pu = 1000000000, numlist.write, pbar.update for x in range(limit): nw('%010d\n'%(x,)) pu(x) pbar.finish() </code></pre> <p>EDIT: So I have discovered that the formatting (regardless of what programming language you are using), creates vast amounts of overhead. <code>Seq</code> gets the job done quickly, but much more slowly with the formatting option (-f). However, if anyone would like to offer a python solution nonetheless, it would be most welcome.</p>
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    1. COWhy do you need to do this? What use would such a file be?
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    2. COPossibly, OP is using `tail -f` on the file to monitor progress
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    3. CO@Steven Rumbalski, I am penetration testing my own network.
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