>>> class dict_(dict):
    def append(self,*args):
            for arg in args:
                if arg and  type(arg)==dict:
                    for i in arg.iteritems():
                        key = i[0]
                        value = i[1]
                        self[key] = value
                else:
                    raise Exception("Not a dictionary.")


>>> x = dict_({4:3})
>>> x.append(5)

Traceback (most recent call last):
  File "<pyshell#136>", line 1, in <module>
    x.append(5)
  File "<pyshell#134>", line 10, in append
    raise Exception("Not a dictionary.")
Exception: Not a dictionary.
>>> x.append({11:11},{12:12})
>>> x
{12: 12, 11: 11, 4: 3}
>>> x.append({433:23,223:12})
>>> x
{12: 12, 11: 11, 4: 3, 223: 12, 433: 23}