title: complex number to polar form in python
body: <p>I'm new to python so please bear with me. 
  The problem is:</p>
  
  <p>"Write a function polar(z) to convert a complex number to its polar form (r,theta). You may use the math.atan2 and math.hypot functions but not the cmath library."</p>
  
  <p>I don't even know where to start with this one, but so far I have:</p>
  
  <pre><code>import math
  def polar(z):
      z = a + bj
      r = math.hypot(a,b)
      theta = math.atan2(b,a)
      print "(",r,",",theta,")"
  </code></pre>
  
  <p>Any help will do!</p>