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-rw-r--r--youtube_dl/utils.py8
1 files changed, 8 insertions, 0 deletions
diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index c4262936e..29d62130a 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -53,6 +53,8 @@ from .compat import (
compat_etree_fromstring,
compat_etree_iterfind,
compat_expanduser,
+ compat_filter as filter,
+ compat_filter_fns,
compat_html_entities,
compat_html_entities_html5,
compat_http_client,
@@ -6283,6 +6285,7 @@ def traverse_obj(obj, *paths, **kwargs):
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.
+ - `filter`-builtin: Return the value if it is truthy, `None` otherwise.
`tuple`, `list`, and `dict` all support nested paths and branches.
@@ -6497,6 +6500,11 @@ def traverse_obj(obj, *paths, **kwargs):
objs = (list(filtered_objs),)
continue
+ # filter might be from __builtin__, future_builtins, or itertools.ifilter
+ if key in compat_filter_fns:
+ objs = filter(None, objs)
+ continue
+
if __debug__ and callable(key):
# Verify function signature
_try_bind_args(key, None, None)