[utils] Update traverse_obj() from yt-dlp

* remove `is_user_input` option per https://github.com/yt-dlp/yt-dlp/pull/8673
* support traversal of compat_xml_etree_ElementTree_Element per https://github.com/yt-dlp/yt-dlp/pull/8911
* allow un/branching using all and any per https://github.com/yt-dlp/yt-dlp/pull/9571
* support traversal of compat_cookies.Morsel and multiple types in `set()` keys per https://github.com/yt-dlp/yt-dlp/pull/9577
thx Grub4k for these
* also, move traversal tests to a separate class
* allow for unordered dicts in tests for Py<3.7

3 files changed, 267 insertions, 101 deletions

diff --git a/test/test_utils.py b/test/test_utils.py
index ca36909a8..179d21cf5 100644
--- a/test/test_utils.py
+++ b/test/test_utils.py
@@ -123,6 +123,7 @@ from youtube_dl.compat import (
     compat_chr,
     compat_etree_fromstring,
     compat_getenv,
+    compat_http_cookies,
     compat_os_name,
     compat_setenv,
     compat_str,
@@ -132,10 +133,6 @@ from youtube_dl.compat import (
 
 class TestUtil(unittest.TestCase):
 
-    # yt-dlp shim
-    def assertCountEqual(self, expected, got, msg='count should be the same'):
-        return self.assertEqual(len(tuple(expected)), len(tuple(got)), msg=msg)
-
     def test_timeconvert(self):
         self.assertTrue(timeconvert('') is None)
         self.assertTrue(timeconvert('bougrg') is None)
@@ -740,28 +737,6 @@ class TestUtil(unittest.TestCase):
         self.assertRaises(
             ValueError, multipart_encode, {b'field': b'value'}, boundary='value')
 
-    def test_dict_get(self):
-        FALSE_VALUES = {
-            'none': None,
-            'false': False,
-            'zero': 0,
-            'empty_string': '',
-            'empty_list': [],
-        }
-        d = FALSE_VALUES.copy()
-        d['a'] = 42
-        self.assertEqual(dict_get(d, 'a'), 42)
-        self.assertEqual(dict_get(d, 'b'), None)
-        self.assertEqual(dict_get(d, 'b', 42), 42)
-        self.assertEqual(dict_get(d, ('a', )), 42)
-        self.assertEqual(dict_get(d, ('b', 'a', )), 42)
-        self.assertEqual(dict_get(d, ('b', 'c', 'a', 'd', )), 42)
-        self.assertEqual(dict_get(d, ('b', 'c', )), None)
-        self.assertEqual(dict_get(d, ('b', 'c', ), 42), 42)
-        for key, false_value in FALSE_VALUES.items():
-            self.assertEqual(dict_get(d, ('b', 'c', key, )), None)
-            self.assertEqual(dict_get(d, ('b', 'c', key, ), skip_false_values=False), false_value)
-
     def test_merge_dicts(self):
         self.assertEqual(merge_dicts({'a': 1}, {'b': 2}), {'a': 1, 'b': 2})
         self.assertEqual(merge_dicts({'a': 1}, {'a': 2}), {'a': 1})
@@ -1703,24 +1678,46 @@ Line 1
         self.assertEqual(variadic('spam', allowed_types=dict), 'spam')
         self.assertEqual(variadic('spam', allowed_types=[dict]), 'spam')
 
+    def test_join_nonempty(self):
+        self.assertEqual(join_nonempty('a', 'b'), 'a-b')
+        self.assertEqual(join_nonempty(
+            'a', 'b', 'c', 'd',
+            from_dict={'a': 'c', 'c': [], 'b': 'd', 'd': None}), 'c-d')
+
+
+class TestTraversal(unittest.TestCase):
+    str = compat_str
+    _TEST_DATA = {
+        100: 100,
+        1.2: 1.2,
+        'str': 'str',
+        'None': None,
+        '...': Ellipsis,
+        'urls': [
+            {'index': 0, 'url': 'https://www.example.com/0'},
+            {'index': 1, 'url': 'https://www.example.com/1'},
+        ],
+        'data': (
+            {'index': 2},
+            {'index': 3},
+        ),
+        'dict': {},
+    }
+
+    # yt-dlp shim
+    def assertCountEqual(self, expected, got, msg='count should be the same'):
+        return self.assertEqual(len(tuple(expected)), len(tuple(got)), msg=msg)
+
+    def assertMaybeCountEqual(self, *args, **kwargs):
+        if sys.version_info < (3, 7):
+            # random dict order
+            return self.assertCountEqual(*args, **kwargs)
+        else:
+            return self.assertEqual(*args, **kwargs)
+
     def test_traverse_obj(self):
-        str = compat_str
-        _TEST_DATA = {
-            100: 100,
-            1.2: 1.2,
-            'str': 'str',
-            'None': None,
-            '...': Ellipsis,
-            'urls': [
-                {'index': 0, 'url': 'https://www.example.com/0'},
-                {'index': 1, 'url': 'https://www.example.com/1'},
-            ],
-            'data': (
-                {'index': 2},
-                {'index': 3},
-            ),
-            'dict': {},
-        }
+        str = self.str
+        _TEST_DATA = self._TEST_DATA
 
         # define a pukka Iterable
         def iter_range(stop):
@@ -1771,15 +1768,19 @@ Line 1
         # Test set as key (transformation/type, like `expected_type`)
         self.assertEqual(traverse_obj(_TEST_DATA, (Ellipsis, T(str.upper), )), ['STR'],
                          msg='Function in set should be a transformation')
+        self.assertEqual(traverse_obj(_TEST_DATA, ('fail', T(lambda _: 'const'))), 'const',
+                         msg='Function in set should always be called')
         self.assertEqual(traverse_obj(_TEST_DATA, (Ellipsis, T(str))), ['str'],
                          msg='Type in set should be a type filter')
+        self.assertMaybeCountEqual(traverse_obj(_TEST_DATA, (Ellipsis, T(str, int))), [100, 'str'],
+                                   msg='Multiple types in set should be a type filter')
         self.assertEqual(traverse_obj(_TEST_DATA, T(dict)), _TEST_DATA,
                          msg='A single set should be wrapped into a path')
         self.assertEqual(traverse_obj(_TEST_DATA, (Ellipsis, T(str.upper))), ['STR'],
                          msg='Transformation function should not raise')
-        self.assertEqual(traverse_obj(_TEST_DATA, (Ellipsis, T(str_or_none))),
-                         [item for item in map(str_or_none, _TEST_DATA.values()) if item is not None],
-                         msg='Function in set should be a transformation')
+        self.assertMaybeCountEqual(traverse_obj(_TEST_DATA, (Ellipsis, T(str_or_none))),
+                                   [item for item in map(str_or_none, _TEST_DATA.values()) if item is not None],
+                                   msg='Function in set should be a transformation')
         if __debug__:
             with self.assertRaises(Exception, msg='Sets with length != 1 should raise in debug'):
                 traverse_obj(_TEST_DATA, set())
@@ -1992,23 +1993,6 @@ Line 1
         self.assertEqual(traverse_obj({}, (0, slice(1)), _traverse_string=True), [],
                          msg='branching should result in list if `traverse_string`')
 
-        # Test is_user_input behavior
-        _IS_USER_INPUT_DATA = {'range8': list(range(8))}
-        self.assertEqual(traverse_obj(_IS_USER_INPUT_DATA, ('range8', '3'),
-                                      _is_user_input=True), 3,
-                         msg='allow for string indexing if `is_user_input`')
-        self.assertCountEqual(traverse_obj(_IS_USER_INPUT_DATA, ('range8', '3:'),
-                                           _is_user_input=True), tuple(range(8))[3:],
-                              msg='allow for string slice if `is_user_input`')
-        self.assertCountEqual(traverse_obj(_IS_USER_INPUT_DATA, ('range8', ':4:2'),
-                                           _is_user_input=True), tuple(range(8))[:4:2],
-                              msg='allow step in string slice if `is_user_input`')
-        self.assertCountEqual(traverse_obj(_IS_USER_INPUT_DATA, ('range8', ':'),
-                                           _is_user_input=True), range(8),
-                              msg='`:` should be treated as `...` if `is_user_input`')
-        with self.assertRaises(TypeError, msg='too many params should result in error'):
-            traverse_obj(_IS_USER_INPUT_DATA, ('range8', ':::'), _is_user_input=True)
-
         # Test re.Match as input obj
         mobj = re.match(r'^0(12)(?P<group>3)(4)?$', '0123')
         self.assertEqual(traverse_obj(mobj, Ellipsis), [x for x in mobj.groups() if x is not None],
@@ -2030,14 +2014,151 @@ Line 1
         self.assertEqual(traverse_obj(mobj, lambda k, _: k in (0, 'group')), ['0123', '3'],
                          msg='function on a `re.Match` should give group name as well')
 
+        # Test xml.etree.ElementTree.Element as input obj
+        etree = compat_etree_fromstring('''<?xml version="1.0"?>
+        <data>
+            <country name="Liechtenstein">
+                <rank>1</rank>
+                <year>2008</year>
+                <gdppc>141100</gdppc>
+                <neighbor name="Austria" direction="E"/>
+                <neighbor name="Switzerland" direction="W"/>
+            </country>
+            <country name="Singapore">
+                <rank>4</rank>
+                <year>2011</year>
+                <gdppc>59900</gdppc>
+                <neighbor name="Malaysia" direction="N"/>
+            </country>
+            <country name="Panama">
+                <rank>68</rank>
+                <year>2011</year>
+                <gdppc>13600</gdppc>
+                <neighbor name="Costa Rica" direction="W"/>
+                <neighbor name="Colombia" direction="E"/>
+            </country>
+        </data>''')
+        self.assertEqual(traverse_obj(etree, ''), etree,
+                         msg='empty str key should return the element itself')
+        self.assertEqual(traverse_obj(etree, 'country'), list(etree),
+                         msg='str key should return all children with that tag name')
+        self.assertEqual(traverse_obj(etree, Ellipsis), list(etree),
+                         msg='`...` as key should return all children')
+        self.assertEqual(traverse_obj(etree, lambda _, x: x[0].text == '4'), [etree[1]],
+                         msg='function as key should get element as value')
+        self.assertEqual(traverse_obj(etree, lambda i, _: i == 1), [etree[1]],
+                         msg='function as key should get index as key')
+        self.assertEqual(traverse_obj(etree, 0), etree[0],
+                         msg='int key should return the nth child')
+        self.assertEqual(traverse_obj(etree, './/neighbor/@name'),
+                         ['Austria', 'Switzerland', 'Malaysia', 'Costa Rica', 'Colombia'],
+                         msg='`@<attribute>` at end of path should give that attribute')
+        self.assertEqual(traverse_obj(etree, '//neighbor/@fail'), [None, None, None, None, None],
+                         msg='`@<nonexistent>` at end of path should give `None`')
+        self.assertEqual(traverse_obj(etree, ('//neighbor/@', 2)), {'name': 'Malaysia', 'direction': 'N'},
+                         msg='`@` should give the full attribute dict')
+        self.assertEqual(traverse_obj(etree, '//year/text()'), ['2008', '2011', '2011'],
+                         msg='`text()` at end of path should give the inner text')
+        self.assertEqual(traverse_obj(etree, '//*[@direction]/@direction'), ['E', 'W', 'N', 'W', 'E'],
+                         msg='full python xpath features should be supported')
+        self.assertEqual(traverse_obj(etree, (0, '@name')), 'Liechtenstein',
+                         msg='special transformations should act on current element')
+        self.assertEqual(traverse_obj(etree, ('country', 0, Ellipsis, 'text()', T(int_or_none))), [1, 2008, 141100],
+                         msg='special transformations should act on current element')
+
+    def test_traversal_unbranching(self):
+        # str = self.str
+        _TEST_DATA = self._TEST_DATA
+
+        self.assertEqual(traverse_obj(_TEST_DATA, [(100, 1.2), all]), [100, 1.2],
+                         msg='`all` should give all results as list')
+        self.assertEqual(traverse_obj(_TEST_DATA, [(100, 1.2), any]), 100,
+                         msg='`any` should give the first result')
+        self.assertEqual(traverse_obj(_TEST_DATA, [100, all]), [100],
+                         msg='`all` should give list if non branching')
+        self.assertEqual(traverse_obj(_TEST_DATA, [100, any]), 100,
+                         msg='`any` should give single item if non branching')
+        self.assertEqual(traverse_obj(_TEST_DATA, [('dict', 'None', 100), all]), [100],
+                         msg='`all` should filter `None` and empty dict')
+        self.assertEqual(traverse_obj(_TEST_DATA, [('dict', 'None', 100), any]), 100,
+                         msg='`any` should filter `None` and empty dict')
+        self.assertEqual(traverse_obj(_TEST_DATA, [{
+            'all': [('dict', 'None', 100, 1.2), all],
+            'any': [('dict', 'None', 100, 1.2), any],
+        }]), {'all': [100, 1.2], 'any': 100},
+            msg='`all`/`any` should apply to each dict path separately')
+        self.assertEqual(traverse_obj(_TEST_DATA, [{
+            'all': [('dict', 'None', 100, 1.2), all],
+            'any': [('dict', 'None', 100, 1.2), any],
+        }], get_all=False), {'all': [100, 1.2], 'any': 100},
+            msg='`all`/`any` should apply to dict regardless of `get_all`')
+        self.assertIs(traverse_obj(_TEST_DATA, [('dict', 'None', 100, 1.2), all, T(float)]), None,
+                      msg='`all` should reset branching status')
+        self.assertIs(traverse_obj(_TEST_DATA, [('dict', 'None', 100, 1.2), any, T(float)]), None,
+                      msg='`any` should reset branching status')
+        self.assertEqual(traverse_obj(_TEST_DATA, [('dict', 'None', 100, 1.2), all, Ellipsis, T(float)]), [1.2],
+                         msg='`all` should allow further branching')
+        self.assertEqual(traverse_obj(_TEST_DATA, [('dict', 'None', 'urls', 'data'), any, Ellipsis, 'index']), [0, 1],
+                         msg='`any` should allow further branching')
+
+    def test_traversal_morsel(self):
+        values = {
+            'expires': 'a',
+            'path': 'b',
+            'comment': 'c',
+            'domain': 'd',
+            'max-age': 'e',
+            'secure': 'f',
+            'httponly': 'g',
+            'version': 'h',
+            'samesite': 'i',
+        }
+        # SameSite added in Py3.8, breaks .update for 3.5-3.7
+        if sys.version_info < (3, 8):
+            del values['samesite']
+        morsel = compat_http_cookies.Morsel()
+        morsel.set(str('item_key'), 'item_value', 'coded_value')
+        morsel.update(values)
+        values['key'] = str('item_key')
+        values['value'] = 'item_value'
+        values = dict((str(k), v) for k, v in values.items())
+        # make test pass even without ordered dict
+        value_set = set(values.values())
+
+        for key, value in values.items():
+            self.assertEqual(traverse_obj(morsel, key), value,
+                             msg='Morsel should provide access to all values')
+        self.assertEqual(set(traverse_obj(morsel, Ellipsis)), value_set,
+                         msg='`...` should yield all values')
+        self.assertEqual(set(traverse_obj(morsel, lambda k, v: True)), value_set,
+                         msg='function key should yield all values')
+        self.assertIs(traverse_obj(morsel, [(None,), any]), morsel,
+                      msg='Morsel should not be implicitly changed to dict on usage')
+
     def test_get_first(self):
         self.assertEqual(get_first([{'a': None}, {'a': 'spam'}], 'a'), 'spam')
 
-    def test_join_nonempty(self):
-        self.assertEqual(join_nonempty('a', 'b'), 'a-b')
-        self.assertEqual(join_nonempty(
-            'a', 'b', 'c', 'd',
-            from_dict={'a': 'c', 'c': [], 'b': 'd', 'd': None}), 'c-d')
+    def test_dict_get(self):
+        FALSE_VALUES = {
+            'none': None,
+            'false': False,
+            'zero': 0,
+            'empty_string': '',
+            'empty_list': [],
+        }
+        d = FALSE_VALUES.copy()
+        d['a'] = 42
+        self.assertEqual(dict_get(d, 'a'), 42)
+        self.assertEqual(dict_get(d, 'b'), None)
+        self.assertEqual(dict_get(d, 'b', 42), 42)
+        self.assertEqual(dict_get(d, ('a', )), 42)
+        self.assertEqual(dict_get(d, ('b', 'a', )), 42)
+        self.assertEqual(dict_get(d, ('b', 'c', 'a', 'd', )), 42)
+        self.assertEqual(dict_get(d, ('b', 'c', )), None)
+        self.assertEqual(dict_get(d, ('b', 'c', ), 42), 42)
+        for key, false_value in FALSE_VALUES.items():
+            self.assertEqual(dict_get(d, ('b', 'c', key, )), None)
+            self.assertEqual(dict_get(d, ('b', 'c', key, ), skip_false_values=False), false_value)
 
 
 if __name__ == '__main__':
diff --git a/youtube_dl/compat.py b/youtube_dl/compat.py
index 53ff2a892..d5485c7e8 100644
--- a/youtube_dl/compat.py
+++ b/youtube_dl/compat.py
@@ -2719,8 +2719,14 @@ if sys.version_info < (2, 7):
         if isinstance(xpath, compat_str):
             xpath = xpath.encode('ascii')
         return xpath
+
+    def compat_etree_iterfind(element, match):
+        for from_ in element.findall(match):
+            yield from_
+
 else:
     compat_xpath = lambda xpath: xpath
+    compat_etree_iterfind = lambda element, match: element.iterfind(match)
 
 
 compat_os_name = os._name if os.name == 'java' else os.name
@@ -2955,7 +2961,7 @@ except ImportError:
             return self
 
         def __exit__(self, exc_type, exc_val, exc_tb):
-            return exc_val is not None and isinstance(exc_val, self._exceptions or tuple())
+            return exc_type is not None and issubclass(exc_type, self._exceptions or tuple())
 
 
 # subprocess.Popen context manager
@@ -3308,6 +3314,7 @@ __all__ = [
     'compat_contextlib_suppress',
     'compat_ctypes_WINFUNCTYPE',
     'compat_etree_fromstring',
+    'compat_etree_iterfind',
     'compat_filter',
     'compat_get_terminal_size',
     'compat_getenv',
diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index e1b05b307..cd4303566 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -49,11 +49,14 @@ from .compat import (
     compat_cookiejar,
     compat_ctypes_WINFUNCTYPE,
     compat_datetime_timedelta_total_seconds,
+    compat_etree_Element,
     compat_etree_fromstring,
+    compat_etree_iterfind,
     compat_expanduser,
     compat_html_entities,
     compat_html_entities_html5,
     compat_http_client,
+    compat_http_cookies,
     compat_integer_types,
     compat_kwargs,
     compat_ncompress as ncompress,
@@ -6253,15 +6256,16 @@ if __debug__:
 
 def traverse_obj(obj, *paths, **kwargs):
     """
-    Safely traverse nested `dict`s and `Iterable`s
+    Safely traverse nested `dict`s and `Iterable`s, etc
 
     >>> obj = [{}, {"key": "value"}]
     >>> traverse_obj(obj, (1, "key"))
-    "value"
+    'value'
 
     Each of the provided `paths` is tested and the first producing a valid result will be returned.
     The next path will also be tested if the path branched but no results could be found.
-    Supported values for traversal are `Mapping`, `Iterable` and `re.Match`.
+    Supported values for traversal are `Mapping`, `Iterable`, `re.Match`, `xml.etree.ElementTree`
+    (xpath) and `http.cookies.Morsel`.
     Unhelpful values (`{}`, `None`) are treated as the absence of a value and discarded.
 
     The paths will be wrapped in `variadic`, so that `'key'` is conveniently the same as `('key', )`.
@@ -6269,8 +6273,9 @@ def traverse_obj(obj, *paths, **kwargs):
     The keys in the path can be one of:
         - `None`:           Return the current object.
         - `set`:            Requires the only item in the set to be a type or function,
-                            like `{type}`/`{func}`. If a `type`, returns only values
-                            of this type. If a function, returns `func(obj)`.
+                            like `{type}`/`{type, type, ...}`/`{func}`. If one or more `type`s,
+                            return only values that have one of the types. If a function,
+                            return `func(obj)`.
         - `str`/`int`:      Return `obj[key]`. For `re.Match`, return `obj.group(key)`.
         - `slice`:          Branch out and return all values in `obj[key]`.
         - `Ellipsis`:       Branch out and return a list of all values.
@@ -6282,8 +6287,10 @@ def traverse_obj(obj, *paths, **kwargs):
                             For `Iterable`s, `key` is the enumeration count of the value.
                             For `re.Match`es, `key` is the group number (0 = full match)
                             as well as additionally any group names, if given.
-        - `dict`            Transform the current object and return a matching dict.
+        - `dict`:           Transform the current object and return a matching dict.
                             Read as: `{key: traverse_obj(obj, path) for key, path in dct.items()}`.
+        - `any`-builtin:    Take the first matching object and return it, resetting branching.
+        - `all`-builtin:    Take all matching objects and return them as a list, resetting branching.
 
         `tuple`, `list`, and `dict` all support nested paths and branches.
 
@@ -6299,10 +6306,8 @@ def traverse_obj(obj, *paths, **kwargs):
     @param get_all          If `False`, return the first matching result, otherwise all matching ones.
     @param casesense        If `False`, consider string dictionary keys as case insensitive.
 
-    The following are only meant to be used by YoutubeDL.prepare_outtmpl and are not part of the API
+    The following is only meant to be used by YoutubeDL.prepare_outtmpl and is not part of the API
 
-    @param _is_user_input    Whether the keys are generated from user input.
-                            If `True` strings get converted to `int`/`slice` if needed.
     @param _traverse_string  Whether to traverse into objects as strings.
                             If `True`, any non-compatible object will first be
                             converted into a string and then traversed into.
@@ -6322,7 +6327,6 @@ def traverse_obj(obj, *paths, **kwargs):
     expected_type = kwargs.get('expected_type')
     get_all = kwargs.get('get_all', True)
     casesense = kwargs.get('casesense', True)
-    _is_user_input = kwargs.get('_is_user_input', False)
     _traverse_string = kwargs.get('_traverse_string', False)
 
     # instant compat
@@ -6336,10 +6340,8 @@ def traverse_obj(obj, *paths, **kwargs):
         type_test = lambda val: try_call(expected_type or IDENTITY, args=(val,))
 
     def lookup_or_none(v, k, getter=None):
-        try:
+        with compat_contextlib_suppress(LookupError):
             return getter(v, k) if getter else v[k]
-        except IndexError:
-            return None
 
     def from_iterable(iterables):
         # chain.from_iterable(['ABC', 'DEF']) --> A B C D E F
@@ -6361,12 +6363,13 @@ def traverse_obj(obj, *paths, **kwargs):
             result = obj
 
         elif isinstance(key, set):
-            assert len(key) == 1, 'Set should only be used to wrap a single item'
-            item = next(iter(key))
-            if isinstance(item, type):
-                result = obj if isinstance(obj, item) else None
+            assert len(key) >= 1, 'At least one item is required in a `set` key'
+            if all(isinstance(item, type) for item in key):
+                result = obj if isinstance(obj, tuple(key)) else None
             else:
-                result = try_call(item, args=(obj,))
+                item = next(iter(key))
+                assert len(key) == 1, 'Multiple items in a `set` key must all be types'
+                result = try_call(item, args=(obj,)) if not isinstance(item, type) else None
 
         elif isinstance(key, (list, tuple)):
             branching = True
@@ -6375,9 +6378,11 @@ def traverse_obj(obj, *paths, **kwargs):
 
         elif key is Ellipsis:
             branching = True
+            if isinstance(obj, compat_http_cookies.Morsel):
+                obj = dict(obj, key=obj.key, value=obj.value)
             if isinstance(obj, compat_collections_abc.Mapping):
                 result = obj.values()
-            elif is_iterable_like(obj):
+            elif is_iterable_like(obj, (compat_collections_abc.Iterable, compat_etree_Element)):
                 result = obj
             elif isinstance(obj, compat_re_Match):
                 result = obj.groups()
@@ -6389,9 +6394,11 @@ def traverse_obj(obj, *paths, **kwargs):
 
         elif callable(key):
             branching = True
+            if isinstance(obj, compat_http_cookies.Morsel):
+                obj = dict(obj, key=obj.key, value=obj.value)
             if isinstance(obj, compat_collections_abc.Mapping):
                 iter_obj = obj.items()
-            elif is_iterable_like(obj):
+            elif is_iterable_like(obj, (compat_collections_abc.Iterable, compat_etree_Element)):
                 iter_obj = enumerate(obj)
             elif isinstance(obj, compat_re_Match):
                 iter_obj = itertools.chain(
@@ -6413,6 +6420,8 @@ def traverse_obj(obj, *paths, **kwargs):
                           if v is not None or default is not NO_DEFAULT) or None
 
         elif isinstance(obj, compat_collections_abc.Mapping):
+            if isinstance(obj, compat_http_cookies.Morsel):
+                obj = dict(obj, key=obj.key, value=obj.value)
             result = (try_call(obj.get, args=(key,))
                       if casesense or try_call(obj.__contains__, args=(key,))
                       else next((v for k, v in obj.items() if casefold(k) == key), None))
@@ -6430,12 +6439,40 @@ def traverse_obj(obj, *paths, **kwargs):
         else:
             result = None
             if isinstance(key, (int, slice)):
-                if is_iterable_like(obj, compat_collections_abc.Sequence):
+                if is_iterable_like(obj, (compat_collections_abc.Sequence, compat_etree_Element)):
                     branching = isinstance(key, slice)
                     result = lookup_or_none(obj, key)
                 elif _traverse_string:
                     result = lookup_or_none(str(obj), key)
 
+            elif isinstance(obj, compat_etree_Element) and isinstance(key, str):
+                xpath, _, special = key.rpartition('/')
+                if not special.startswith('@') and not special.endswith('()'):
+                    xpath = key
+                    special = None
+
+                # Allow abbreviations of relative paths, absolute paths error
+                if xpath.startswith('/'):
+                    xpath = '.' + xpath
+                elif xpath and not xpath.startswith('./'):
+                    xpath = './' + xpath
+
+                def apply_specials(element):
+                    if special is None:
+                        return element
+                    if special == '@':
+                        return element.attrib
+                    if special.startswith('@'):
+                        return try_call(element.attrib.get, args=(special[1:],))
+                    if special == 'text()':
+                        return element.text
+                    raise SyntaxError('apply_specials is missing case for {0!r}'.format(special))
+
+                if xpath:
+                    result = list(map(apply_specials, compat_etree_iterfind(obj, xpath)))
+                else:
+                    result = apply_specials(obj)
+
         return branching, result if branching else (result,)
 
     def lazy_last(iterable):
@@ -6456,17 +6493,18 @@ def traverse_obj(obj, *paths, **kwargs):
 
         key = None
         for last, key in lazy_last(variadic(path, (str, bytes, dict, set))):
-            if _is_user_input and isinstance(key, str):
-                if key == ':':
-                    key = Ellipsis
-                elif ':' in key:
-                    key = slice(*map(int_or_none, key.split(':')))
-                elif int_or_none(key) is not None:
-                    key = int(key)
-
             if not casesense and isinstance(key, str):
                 key = compat_casefold(key)
 
+            if key in (any, all):
+                has_branched = False
+                filtered_objs = (obj for obj in objs if obj not in (None, {}))
+                if key is any:
+                    objs = (next(filtered_objs, None),)
+                else:
+                    objs = (list(filtered_objs),)
+                continue
+
             if __debug__ and callable(key):
                 # Verify function signature
                 _try_bind_args(key, None, None)
@@ -6505,9 +6543,9 @@ def traverse_obj(obj, *paths, **kwargs):
     return None if default is NO_DEFAULT else default
 
 
-def T(x):
-    """ For use in yt-dl instead of {type} or set((type,)) """
-    return set((x,))
+def T(*x):
+    """ For use in yt-dl instead of {type, ...} or set((type, ...)) """
+    return set(x)
 
 
 def get_first(obj, keys, **kwargs):