docs: def memoize(func):
      """
      Provides memoization for methods on a specific instance.
      Results are cached for given parameter list.
  
      See also: http://en.wikipedia.org/wiki/Memoization
  
      N.B. The cache object gets added to the instance instead of the global scope.
      Therefore cached results are restricted to that instance.
      The cache dictionary gets a name containing the name of the decorated function to
      avoid clashes.
  
      Example:
  
          class MyClass(object):
              @memoize
              def foo(self, a, b):
                  return self._do_calculation(a, b)
  
      HINT: - The decorator does not work with keyword arguments.
      """
  
      cache_name = '__CACHED_{}'.format(func.__name__)
  
      def wrapper(self, *args):
          cache = getattr(self, cache_name, None)
          if cache is None:
              cache = {}
              setattr(self, cache_name, cache)
          if args not in cache:
              cache[args] = func(self, *args)
          return cache[args]
  
      return wrapper