title: argparse without dash argument (just input source filepath)
body: <h2>Question:</h2>
  
  <p>Is it possible to execute: <strong>test_argparse.py c:\folder\somefile.txt</strong> and get</p>
  
  <p>print results: <strong>Namespace(filepath='c:\\folder\\somefile.txt')</strong></p>
  
  <p>Adding <em>-filepath</em> is not a big deal, but just wondering if there is some way to skip it if you only need to pass in a filepath.</p>
  
  <h2>Working Code:</h2>
  
  <p>filename: <strong>test_argparse.py</strong></p>
  
  <pre><code>import argparse
  
  parser = argparse.ArgumentParser()
  
  parser.add_argument('-filepath', metavar='in-file')
  results = parser.parse_args()
  
  print results
  </code></pre>
  
  <p>execute: <strong>test_argparse.py -filepath c:\folder\somefile.txt</strong></p>
  
  <p>print results: <strong>Namespace(filepath='c:\\folder\\somefile.txt')</strong></p>