How to use the werkzeug._compat.iteritems function in Werkzeug

def _walk(node, path):
        for prefix, child in iteritems(node):
            _walk(child, path + (prefix,))
        if not node:
            rv.add('/'.join(path))
    _walk(root, ())

def keys(self, lower=False):
        for key, _ in iteritems(self, lower):
            yield key

def _iter_hashitems(self):
        return iteritems(self)

'AcceptMixin', 'ETagRequestMixin',
                          'ETagResponseMixin', 'ResponseStreamMixin',
                          'CommonResponseDescriptorsMixin', 'UserAgentMixin',
                          'AuthorizationMixin', 'WWWAuthenticateMixin',
                          'CommonRequestDescriptorsMixin'],
    'werkzeug.security': ['generate_password_hash', 'check_password_hash'],
    # the undocumented easteregg ;-)
    'werkzeug._internal': ['_easteregg']
}

# modules that should be imported when accessed as attributes of werkzeug
attribute_modules = frozenset(['exceptions', 'routing', 'script'])


object_origins = {}
for module, items in iteritems(all_by_module):
    for item in items:
        object_origins[item] = module


class module(ModuleType):

    """Automatically import objects from the modules."""

    def __getattr__(self, name):
        if name in object_origins:
            module = __import__(object_origins[name], None, None, [name])
            for extra_name in all_by_module[module.__name__]:
                setattr(self, extra_name, getattr(module, extra_name))
            return getattr(module, name)
        elif name in attribute_modules:
            __import__('werkzeug.' + name)

def print_usage(actions):
    """Print the usage information.  (Help screen)"""
    _deprecated()
    actions = sorted(iteritems(actions))
    print('usage: %s  []' % basename(sys.argv[0]))
    print('       %s --help' % basename(sys.argv[0]))
    print()
    print('actions:')
    for name, (func, doc, arguments) in actions:
        print('  %s:' % name)
        for line in doc.splitlines():
            print('    %s' % line)
        if arguments:
            print()
        for arg, shortcut, default, argtype in arguments:
            if isinstance(default, bool):
                print('    %s' % (
                    (shortcut and '-%s, ' % shortcut or '') + '--' + arg
                ))
            else:

def get_rules(self, map):
        for rulefactory in self.rules:
            for rule in rulefactory.get_rules(map):
                new_defaults = subdomain = None
                if rule.defaults:
                    new_defaults = {}
                    for key, value in iteritems(rule.defaults):
                        if isinstance(value, string_types):
                            value = format_string(value, self.context)
                        new_defaults[key] = value
                if rule.subdomain is not None:
                    subdomain = format_string(rule.subdomain, self.context)
                new_endpoint = rule.endpoint
                if isinstance(new_endpoint, string_types):
                    new_endpoint = format_string(new_endpoint, self.context)
                yield Rule(
                    format_string(rule.rule, self.context),
                    new_defaults,
                    subdomain,
                    rule.methods,
                    rule.build_only,
                    new_endpoint,
                    rule.strict_slashes

def __eq__(self, other):
        if not isinstance(other, MultiDict):
            return NotImplemented
        if isinstance(other, OrderedMultiDict):
            iter1 = iteritems(self, multi=True)
            iter2 = iteritems(other, multi=True)
            try:
                for k1, v1 in iter1:
                    k2, v2 = next(iter2)
                    if k1 != k2 or v1 != v2:
                        return False
            except StopIteration:
                return False
            try:
                next(iter2)
            except StopIteration:
                return True
            return False
        if len(self) != len(other):
            return False
        for key, values in iterlists(self):
            if other.getlist(key) != values:

appended to the URL as query parameters.
        :param method: the HTTP method for the rule if there are different
                       URLs for different methods on the same endpoint.
        :param force_external: enforce full canonical external URLs. If the URL
                               scheme is not provided, this will generate
                               a protocol-relative URL.
        :param append_unknown: unknown parameters are appended to the generated
                               URL as query string argument.  Disable this
                               if you want the builder to ignore those.
        """
        self.map.update()
        if values:
            if isinstance(values, MultiDict):
                valueiter = iteritems(values, multi=True)
            else:
                valueiter = iteritems(values)
            values = dict((k, v) for k, v in valueiter if v is not None)
        else:
            values = {}

        rv = self._partial_build(endpoint, values, method, append_unknown)
        if rv is None:
            raise BuildError(endpoint, values, method, self)
        domain_part, path = rv

        host = self.get_host(domain_part)

        # shortcut this.
        if not force_external and (
            (self.map.host_matching and host == self.server_name) or
            (not self.map.host_matching and domain_part == self.subdomain)
        ):

def items(self, multi=False):
        found = set()
        for d in self.dicts:
            for key, value in iteritems(d, multi):
                if multi:
                    yield key, value
                elif key not in found:
                    found.add(key)
                    yield key, value

def iter_multi_items(mapping):
    """Iterates over the items of a mapping yielding keys and values
    without dropping any from more complex structures.
    """
    if isinstance(mapping, MultiDict):
        for item in iteritems(mapping, multi=True):
            yield item
    elif isinstance(mapping, dict):
        for key, value in iteritems(mapping):
            if isinstance(value, (tuple, list)):
                for value in value:
                    yield key, value
            else:
                yield key, value
    else:
        for item in mapping:
            yield item