code: def _copy_default(cls, default):
          ''' Return a copy of the default, or a new value if the default
          is specified by a function.
  
          '''
          if not isinstance(default, types.FunctionType):
              return copy(default)
          else:
              return default(f _copy_default(cls, default):
          ''' Return a copy of the default, or a new value if the default
          is specified by a function.
  
          '''
          if not isinstance(default, types.FunctionType):
              return copy(default)
          else:
              return default()
docs: Return a copy of the default, or a new value if the default
          is specified by a function.