old_contents: from functools import wraps
  
  
  def cached_property(f):
      name = f.__name__
      @property
      @wraps(f)
      def inner(self):
          if not hasattr(self, "_property_cache"):
              self._property_cache = {}
          if name not in self._property_cache:
              self._property_cache[name] = f(self)
          return self._property_cache[name]
      return inner
  
  
  class Constant():
      def __init__(self, x):
          self.x = x
  
      def __repr__(self):
          return self.x
  
new_contents: from functools import wraps
  
  
  def cached_property(f):
      name = f.__name__
      @property
      @wraps(f)
      def inner(self):
          if not hasattr(self, "_property_cache"):
              self._property_cache = {}
          if name not in self._property_cache:
              self._property_cache[name] = f(self)
          return self._property_cache[name]
      return inner
  
  
  class Constant():
      def __init__(self, x):
          self.x = x
  
      def __repr__(self):
          return self.x
  
  
  def constants(namespace, names):
      for name in names:
          namespace[name] = Constant(name)
  
subject: Make it easier to define constants