title: Defining a class constructor using python
body: <p>Write a constructor with parameters self, num_mins and num_messages. num_mins and num_messages should have a default value of 0.</p>
  
  <p>Sample output with one plan created with input: 200 300, one plan created with no input, and one plan created with input: 500</p>
  
  <p>**My plan... Mins: 200 Messages: 300</p>
  
  <p>Dad's plan... Mins: 0 Messages: 0</p>
  
  <p>Mom's plan... Mins: 500 Messages: 0** </p>
  
  <pre><code>class PhonePlan:
  
      # add constructor
  
      def print_plan(self):
          print('Mins:', self.num_mins, end=' ')
          print('Messages:', self.num_messages)
  
  
  my_plan = PhonePlan(int(input()), int(input()))
  dads_plan = PhonePlan()
  moms_plan = PhonePlan(int(input()))
  
  print('My plan...', end=' ')
  my_plan.print_plan()
  
  print('Dad\'s plan...', end=' ')
  dads_plan.print_plan()
  
  print('Mom\'s plan...', end= ' ')
  moms_plan.print_plan()
  </code></pre>
  
  <p>How would I complete this code?</p>