code: def unquote(cls, value):
          
          try:
              if cls.quote_base64:
                  value = base64.b64decode(value)
              if cls.serialization_method is not None:
                  value = cls.serialization_method.loads(value)
              return value
          except Exception:
              # unfortunately pickle and other serialization modules can
              # cause pretty every error here.  if we get one we catch it
              # and convert it into an UnquoteError
              raise UnquoteError()
docs: Unquote the value for the cookie.  If unquoting does not work a
          :exc:`UnquoteError` is raised.
  
          :param value: the value to unquote.