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    <p>The shortest way would probably be to use the <a href="http://docs.python.org/2/library/fileinput.html?highlight=fileinput#fileinput" rel="noreferrer">fileinput module</a>. For example, the following adds line numbers to a file, in-place:</p> <pre><code>import fileinput for line in fileinput.input("test.txt", inplace=True): print "%d: %s" % (fileinput.filelineno(), line), </code></pre> <p>What happens here is:</p> <ol> <li>The original file is moved to a backup file</li> <li>The standard output is redirected to the original file within the loop</li> <li>Thus any <code>print</code> statements write back into the original file</li> </ol> <p><code>fileinput</code> has more bells and whistles. For example, it can be used to automatically operate on all files in <code>sys.args[1:]</code>, without your having to iterate over them explicitly. Starting with Python 3.2 it also provides a convenient context manager for use in a <code>with</code> statement.</p> <hr> <p>While <code>fileinput</code> is great for throwaway scripts, I would be wary of using it in real code because admittedly it's not very readable or familiar. In real (production) code it's worthwhile to spend just a few more lines of code to make the process explicit and thus make the code readable.</p> <p>There are two options:</p> <ol> <li>The file is not overly large, and you can just read it wholly to memory. Then close the file, reopen it in writing mode and write the modified contents back.</li> <li>The file is too large to be stored in memory; you can move it over to a temporary file and open that, reading it line by line, writing back into the original file. Note that this requires twice the storage.</li> </ol>
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    1. USEli Bendersky
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    1. COI know this only has two lines in it, however I don't think the code is very expressive in itself. Because if you think for a sec, if you didn't know the function, there are very few clues in what is going on. Printing the line number and the line is not the same as writing it ... if you get my gist...
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    2. COi agree. how would one use fileinput to write to the file?
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    3. COThis **DOES** write to the file. It redirects stdout to the file. Have a look at the [docs](http://docs.python.org/library/fileinput.html)
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