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    <h2>Perl, 99 characters</h2> <pre><code>@P=map{$/.substr$".'__/ \\'x99,$_,$W||=1+3*pop}0,(3,6)x pop; chop$P[0-$W%2];print" __"x($W/6),@P </code></pre> <p><strong>Last edit</strong>: Saved one character replacing <code>-($W%2)</code> with <code>0-$W%2</code> (thanks A. Rex)</p> <p><strong>Explanation:</strong></p> <p>For width W and height H, the output is 2+2 * H lines long and 3 * W+1 characters wide, with a lot of repetition in the middle of the output.</p> <p>For convenience, we let <code>$W</code> be 3 * W + 1, the width of the output in characters.</p> <p>The top line consists of the pattern <code>" __"</code>, repeated W/2 == <code>$W/6</code> times.</p> <p>The even numbered lines consist of the repeating pattern <code>"\__/ "</code>, truncated to <code>$W</code> characters. The second line of output is a special case, where the first character of the second line should be a space instead of a <code>\</code>.</p> <p>The odd numbered lines consist of the repeating pattern <code>"/ \__"</code>, truncated to <code>$W</code> characters.</p> <p>We construct a string: <code>" " . "__/ \" x 99</code>. Note that the beginning of this string is the desired output for the second line. This line starting at position 3 is the desired output for the odd lines, and starting at position 6 for the even numbered lines.</p> <p>The LIST argument to the <code>map</code> call begins with 0 and is followed by H repetitions of (3,6). The <code>map</code> call creates a list of the substrings that begin at the appropriate positions and are <code>$W</code> = 3 * W + 1 characters long.</p> <p>There is one more adjustment to make before printing the results. If W is odd, then there is an extra character on the second line (<code>$P[0]</code>) that needs to be <code>chop</code>ped off. If W is even, then there is an extra character on the bottom line (<code>$P[-1]</code>) to chop.</p>
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    1. COI knew Python wouldn't be beating Perl for long.
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    2. CODo you need the parenthesis around the arguments to `map()` or did I just shorten your code by 2 characters?
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    3. COApparently you do not need them. The parentheses in substr() are unnecessary too -- down to 113.
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