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  1. PO
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    <p>You write:</p> <pre><code>outputfile.writelines sorted(data, key=len, reverse=True)[:3] </code></pre> <blockquote> <p>generates nothing.</p> </blockquote> <p>it should actually generate a syntax-error exception because of the missing parentheses -- if it doesn't, I guess you must be using some (allegedly) "smart" IDE like iPython which puts in the parentheses on your behalf -- is that the case?</p> <p>You're printing the three shortest lines, and they well may all be empty -- that should put three empty lines in your output file (and of course show nothing to stdout -- is that what you mean by "generates nothing"?). Maybe you're not properly calling <code>outputfile.close()</code> so by the time you check the file they're still buffered and not written to disk yet.</p> <p>As you see there are a huge number of possibilities around your very ambiguous "generates nothing" assertion. Can you clarify <strong>exactly</strong> what environment you're using and how in particular you're checking what your code "generates" or doesn't? Otherwise, it's very hard to help you much.</p> <p><strong>Edit</strong>: the OP clarified and showed his code -- and the problem is now clear: he's totally consuming <code>inputfile</code> the first time, never "rewinding" it, so the file immediately ends (no lines left in it) at the second <code>readlines</code> call. If you do need to read the file twice independently (rather than just reading it once and passing the data around, as would be normal), you'll need a call <code>inputfile.seek(0)</code> to "rewind the file" each time you read it to make it ready to be read all over again.</p>
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    1. POwrite sorted results to file
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    1. USAlex Martelli
    1. USAlex Martelli
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    1. COSorry. What I should have said was generates an empty text file. The entry has been edited to provide the complete code. I'm using IDLE.
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    2. COAlso, it should be calling the three longest lines. The printed output does so.
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    3. CO@kjarsenal, now that you show your code the problem has become clear, see my answer's edit.
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      1. USAlex Martelli
 

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