bpo-41490: ``path`` and ``contents`` to aggressively close handles (#22915)

* bpo-41490: ``path`` method to aggressively close handles

* Add blurb

* In ZipReader.contents, eagerly evaluate the contents to release references to the zipfile.

* Instead use _ensure_sequence to ensure any iterable from a reader is eagerly converted to a list if it's not already a sequence.

1 files changed, 3 insertions, 3 deletions

diff --git a/Lib/importlib/readers.py b/Lib/importlib/readers.py
index 6331e4d..74a63e4 100644
--- a/Lib/importlib/readers.py
+++ b/Lib/importlib/readers.py
@@ -22,8 +22,8 @@ class FileReader(abc.TraversableResources):
 class ZipReader(abc.TraversableResources):
     def __init__(self, loader, module):
         _, _, name = module.rpartition('.')
-        prefix = loader.prefix.replace('\\', '/') + name + '/'
-        self.path = zipfile.Path(loader.archive, prefix)
+        self.prefix = loader.prefix.replace('\\', '/') + name + '/'
+        self.archive = loader.archive
 
     def open_resource(self, resource):
         try:
@@ -38,4 +38,4 @@ class ZipReader(abc.TraversableResources):
         return target.is_file() and target.exists()
 
     def files(self):
-        return self.path
+        return zipfile.Path(self.archive, self.prefix)