title: Python: Defining a tuple with unknown values inbetween
body: <p>This is a most interesting thing in python I've come across in variable referencing as tuple.
  Could someone give me an equivalent in C???</p>
  
  <pre><code>h = 1,_,3,_
  
  h
  Out[2]: (1, '', 3, '')
  
   h = 1,'',3, ''
  
  h
  Out[5]: (1, '', 3, '')
  </code></pre>
  
  <p>How does this happen? 
  Is _ and '' equal? What is the difference?</p>
  
  <p>how many such magical referencing are possible i wonder??</p>