gh-121735: Fix module-adjacent references in zip files (#123037)

* gh-116608: Apply style and compatibility changes from importlib_metadata.

* gh-121735: Ensure module-adjacent resources are loadable from a zipfile.

* gh-121735: Allow all modules to be processed by the ZipReader.

* Add blurb

* Remove update-zips script, unneeded.

* Remove unnecessary references to removed static fixtures.

* Remove zipdata fixtures, unused.

1 files changed, 10 insertions, 16 deletions

diff --git a/Lib/test/test_importlib/resources/zip.py b/Lib/test/test_importlib/resources/zip.py
index 4dcf6facc77..fc453f02060 100755
--- a/Lib/test/test_importlib/resources/zip.py
+++ b/Lib/test/test_importlib/resources/zip.py
@@ -2,29 +2,23 @@
 Generate zip test data files.
 """
 
-import contextlib
-import os
-import pathlib
 import zipfile
 
 
-def make_zip_file(src, dst):
+def make_zip_file(tree, dst):
     """
-    Zip the files in src into a new zipfile at dst.
+    Zip the files in tree into a new zipfile at dst.
     """
     with zipfile.ZipFile(dst, 'w') as zf:
-        for src_path, rel in walk(src):
-            dst_name = src.name / pathlib.PurePosixPath(rel.as_posix())
-            zf.write(src_path, dst_name)
+        for name, contents in walk(tree):
+            zf.writestr(name, contents)
         zipfile._path.CompleteDirs.inject(zf)
     return dst
 
 
-def walk(datapath):
-    for dirpath, dirnames, filenames in os.walk(datapath):
-        with contextlib.suppress(ValueError):
-            dirnames.remove('__pycache__')
-        for filename in filenames:
-            res = pathlib.Path(dirpath) / filename
-            rel = res.relative_to(datapath)
-            yield res, rel
+def walk(tree, prefix=''):
+    for name, contents in tree.items():
+        if isinstance(contents, dict):
+            yield from walk(contents, prefix=f'{prefix}{name}/')
+        else:
+            yield f'{prefix}{name}', contents