title: Creating list of defined number pattern
body: <p>I want to create a list that produces the output of:</p>
  
  <p><code>[001,002,003,004,005]</code></p>
  
  <p>and keeps going until <code>300</code>. Having the <code>0</code>'s in front of the digits is essential. I tried a method such as:</p>
  
  <pre><code>a = []
  for i in range(0,3):
      for j in range(0,10):
          for k in range(0,10):
              a.append(i j k)
  </code></pre>
  
  <p>However, for obvious reasons, the <code>append</code> function does not behave in the manner I would like. </p>
  
  <p>Do people have any suggestions on how else I could do this?</p>