title: Using modulus operator in a python conditional statement
body: <p>When i run the code, it gives me an error: not all arguments converted during string formatting</p>
  
  <pre><code>year = raw_input( "Please enter a year" )
  
  if year % 4 == 0 &amp;&amp; year % 100 != 0:
      print ( "{0} is a leap year", year )
  elif year % 4 == 0 &amp;&amp; year % 100 == 0 &amp;&amp; year % 400 == 0:
      print ( "{0} is a leap year", year )
  else:
      print ( "{0} is not a leap year", year )
  </code></pre>