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    <p>Okay, two parts:</p> <p>first, to format a number:</p> <pre><code>"{number:06}".format(number=100) </code></pre> <p>will give you <code>'000100'</code>. But before that, we have to round. </p> <p><strong>EDIT:</strong> This solution is much more elegant:</p> <pre><code>import math def rep(number): rounded = 10**(math.floor(math.log(number,10)-math.log(0.5,10))) return "{number:06}".format(number=int(rounded)) </code></pre> <p>Let's see:</p> <pre><code>&gt;&gt;&gt; print rep(100) 000100 &gt;&gt;&gt; print rep(1000) 001000 &gt;&gt;&gt; print rep(501) 001000 &gt;&gt;&gt; print rep(499) 000100 &gt;&gt;&gt; print rep(500) 000100 </code></pre> <p><strong>OLD Version for future reference end educational delight</strong>:</p> <p>(It's still faster as it doesn't involve any <code>log</code> operations)</p> <p>Here's a neat little trick: <code>round(501)</code> will round to the first decimal digit, but <code>round(501, -1)</code> will round to the <code>10^1</code> digit (so the result is <code>500.0</code>), <code>round(501, -2)</code> to the <code>10^2</code> (the result still being <code>500.0</code>), and <code>round(501, -3)</code> will round up to 1000.</p> <p>So we want 500 to be rounded up to 1000, but 53 to be rounded up to 100. Well, here's how we do it:</p> <pre><code>number = 521 rounded = round(number, -len(str(number))) </code></pre> <p>So, since the string describing <code>number</code> is three characters long, we round to -3.</p> <p>However, this rounds up perfectly, but if we're rounding down, it always rounds down to 0. Let's just catch this case:</p> <pre><code>def rep(number): rounded = round(number, -len(str(number))) if not rounded: # 0 evaluates to False rounded = 10**(len(str(number))-1) return "{number:06}".format(number=int(rounded)) </code></pre>
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    1. POHow to control the number of digits when printing numbers?
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    1. COEverything below **Edit** refers to the second part of the question that got deleted by @Tim (Task: 200 -> 000100, 501 -> 001000)
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    2. COI have reverted that part of the question.
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