gistfile1.txt

# this is really verbose #####################################################################

class ConfigureMyApp(object):
  def init(self):
    Looper(height = get_height(), width = get_width())

class Looper:
  def init(self, height = None, width = None):
    self.set_height(height)
    self.set_width(width)

  def set_height(self, height):
    # Do something clever with subclasses here

# This is much better #####################################################################

class ConfigureMyApp(object):
  def init(self):
    self.looper = Looper()
    self.looper.configure |l|
      l.set_height(get_height)
      l.set_width(get_width)

class Looper(object):
  def configure(self, a_function):
    a_function(self)