gh-91298: Refine traversable (apply changes from importlib_resources 5.7.1) (#91623)

* bpo-47142: Refine traversable (apply changes from importlib_resources 5.7.1)

* Replace changelog referencing github issue.

1 files changed, 12 insertions, 3 deletions

diff --git a/Lib/importlib/resources/simple.py b/Lib/importlib/resources/simple.py
index da073cb..d0fbf23 100644
--- a/Lib/importlib/resources/simple.py
+++ b/Lib/importlib/resources/simple.py
@@ -99,10 +99,19 @@ class ResourceContainer(Traversable):
     def open(self, *args, **kwargs):
         raise IsADirectoryError()
 
-    def joinpath(self, name):
+    @staticmethod
+    def _flatten(compound_names):
+        for name in compound_names:
+            yield from name.split('/')
+
+    def joinpath(self, *descendants):
+        if not descendants:
+            return self
+        names = self._flatten(descendants)
+        target = next(names)
         return next(
-            traversable for traversable in self.iterdir() if traversable.name == name
-        )
+            traversable for traversable in self.iterdir() if traversable.name == target
+        ).joinpath(*names)
 
 
 class TraversableReader(TraversableResources, SimpleReader):