1 files changed, 44 insertions, 0 deletions
diff --git a/yt_dlp/compat/compat_utils.py b/yt_dlp/compat/compat_utils.py
new file mode 100644
index 000000000..938daf926
--- /dev/null
+++ b/yt_dlp/compat/compat_utils.py
@@ -0,0 +1,44 @@
+import contextlib
+import importlib
+import sys
+import types
+
+
+def _is_package(module):
+    try:
+        module.__getattribute__('__path__')
+    except AttributeError:
+        return False
+    return True
+
+
+_NO_ATTRIBUTE = object()
+
+
+def passthrough_module(parent, child, *, callback=lambda _: None):
+    parent_module = importlib.import_module(parent)
+    child_module = importlib.import_module(child, parent)
+
+    class PassthroughModule(types.ModuleType):
+        def __getattr__(self, attr):
+            if _is_package(parent_module):
+                with contextlib.suppress(ImportError):
+                    return importlib.import_module(f'.{attr}', parent)
+
+            ret = _NO_ATTRIBUTE
+            with contextlib.suppress(AttributeError):
+                ret = getattr(child_module, attr)
+
+            if _is_package(child_module):
+                with contextlib.suppress(ImportError):
+                    ret = importlib.import_module(f'.{attr}', child)
+
+            if ret is _NO_ATTRIBUTE:
+                raise AttributeError(f'module {parent} has no attribute {attr}')
+
+            callback(attr)
+            return ret
+
+    # Python 3.6 does not have module level __getattr__
+    # https://peps.python.org/pep-0562/
+    sys.modules[parent].__class__ = PassthroughModule