old_contents: """
  
  Compute the force of gravity between the Earth and Sun.
  
  Copyright 2012, Casey W. Stark. See LICENSE.txt for more information.
  
  """
  
  # Import the gravitational constant and the Quantity class
  from dimensionful import G, Quantity
  
  # Supply the mass of Earth, mass of Sun, and the distance between.
  mass_earth = Quantity(5.9742e27, "g")
  mass_sun = Quantity(1.0, "Msun")
  distance = Quantity(1.0, "AU")
  
  # Calculate it
  force_gravity = G * mass_earth * mass_sun / distance**2
  force_gravity.convert_to_cgs()
  
  # Report
  print ""
  print "The force of gravity between the Earth and Sun is %s" % force_gravity
  print ""
  
new_contents: """
  
  Compute the force of gravity between the Earth and Sun.
  
  Copyright 2012, Casey W. Stark. See LICENSE.txt for more information.
  
  """
  
  # Import the gravitational constant and the Quantity class
  from dimensionful import G, Quantity
  
  # Supply the mass of Earth, mass of Sun, and the distance between.
  mass_earth = Quantity(5.9742e27, "g")
  mass_sun = Quantity(1.0, "Msun")
  distance = Quantity(1.0, "AU")
  
  # Calculate it
  force_gravity = G * mass_earth * mass_sun / distance**2
  force_gravity.convert_to_cgs()
  
  # Report
  print ""
  print "The force of gravity between the Earth and Sun is %s" % force_gravity
  print ""
  
  # prints "The force of gravity between the Earth and Sun is 3.54296304519e+27 cm*g/s**2"
  
subject: Add what the example should output.