Method update

django/utils/datastructures.py:200–215

Extend rather than replace existing key lists.

(self, *args, **kwargs)

        return copy.copy(self)

    def update(self, *args, **kwargs):
        """Extend rather than replace existing key lists."""
        if len(args) > 1:
            raise TypeError("update expected at most 1 argument, got %d" % len(args))
        if args:
            arg = args[0]
            if isinstance(arg, MultiValueDict):
                for key, value_list in arg.lists():
                    self.setlistdefault(key).extend(value_list)
            else:
                if isinstance(arg, Mapping):
                    arg = arg.items()
                for key, value in arg:
                    self.setlistdefault(key).append(value)
        for key, value in kwargs.items():
            self.setlistdefault(key).append(value)

    def dict(self):
        """Return current object as a dict with singular values."""