new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  
  """ Module for line object in energy profile.
  """
  
  class EPLine(object):
      """ Base class for lines in energy profile.
      """
      def __init__(self, x, y, **kwargs):
          self.x = x
          self.y = y
  
          self.color = kwargs.pop("color", "#000000")
          self.shadow_color = kwargs.pop("shadow_color", "#595959")
  
  
subject: Add EPLine class as an ABC for energy profile lines.