title: Python Array Slice With Comma?
body: <p>I was wondering what the use of the comma was when slicing Python arrays - I have an example that appears to work, but the line that looks weird to me is</p>
  
  <pre><code>p = 20*numpy.log10(numpy.abs(numpy.fft.rfft(data[:2048, 0])))
  </code></pre>
  
  <p>Now, I know that when slicing an array, the first number is start, the next is end, and the last is step, but what does the comma after the end number designate? Thanks.</p>