title: Getting user input
body: <p>I am running this:</p>
  
  <pre><code>import csv
  import sys
  reader = csv.reader(open(sys.argv[0], "rb"))
  for row in reader:
      print row
  </code></pre>
  
  <p>And I get this in response:</p>
  
  <pre><code>['import csv']
  ['import sys']
  ['reader = csv.reader(open(sys.argv[0]', ' "rb"))']
  ['for row in reader:']
  ['    print row']
  &gt;&gt;&gt; 
  </code></pre>
  
  <p>For the <code>sys.argv[0]</code> I would like it to prompt me to enter a filename.</p>
  
  <p>How do I get it to prompt me to enter a filename?</p>