title: . (dot) in argparse argument and variable name
body: <p>Is it possible to have an argument parser like this?</p>
  
  <pre><code>import argparse
  parser.add_argument('query2target.bam', help='A bam file containing contigs from \'query\' aligned to contigs in \'target\'')
  args = parser.parse_args()
  q2t = args.query2target.bam
  </code></pre>
  
  <p>I want the parser name to be 'query2target.bam' but then when I go to name a variable after it, <code>q2t = args.query2target.bam</code> it thinks that the extension is a function method. How do I solve this without renaming the argument?</p>