title: Python 2.7 argparse
body: <p>I have a function:</p>
  
  <p><code>def x(a,b,c)</code></p>
  
  <p>How can I collect variable values from the command line that fit this pattern?</p>
  
  <p><code>python test.py --x_center a --y_center b  c</code> (<code>c</code> has, for example, 3, 4 or more values )</p>