anchor.diff:  
       $PyDict([pairs]) {
           _dict = new Map();
  +        var key = new $PyNum(0);
  +        var key1 = new $PyNum(1);
   
           switch ($getType(pairs)) {
               case 3:
                   for (var pair in pairs)
  -                    _dict[pair[0]] = pair[1];
  +                    _dict[pair[key]] = pair[key1];
                   break;
               case -1:
                   break;
  
positive.code: 
          return pdt;
      }
  }
  
  list([iterable]) => new $PyList(iterable);
  
negative.code:     iteritems() => items();
      iterkeys() => new $PyList(_dict.keys);
      itervalues() => new $PyList(_dict.values);
      keys() => new $PyList(_dict.keys.toList());
      values() => new $PyList(_dict.values.toList());
      has_key(key) => _dict.hasKey(key);
      contains(key) => has_Key(key);
      copy() => this;
  