[3.12] gh-121735: Fix module-adjacent references in zip files

jaraco · jaraco · commit c6dfba2100c4 · 2024-09-12T11:00:40.000-04:00
Applying the fix only and not the refactoring of the test suite.
diff --git a/Lib/importlib/resources/readers.py b/Lib/importlib/resources/readers.py
@@ -31,8 +31,10 @@ def files(self):
 
 class ZipReader(abc.TraversableResources):
     def __init__(self, loader, module):
-        _, _, name = module.rpartition('.')
-        self.prefix = loader.prefix.replace('\\', '/') + name + '/'
+        self.prefix = loader.prefix.replace('\\', '/')
+        if loader.is_package(module):
+            _, _, name = module.rpartition('.')
+            self.prefix += name + '/'
         self.archive = loader.archive
 
     def open_resource(self, resource):
