This approach begins to work, but it requires as_file to be aware of the internals of zipfile.Path.

Author: jaraco

importlib_resources/_common.py

@@ -93,7 +93,6 @@ def _tempfile(reader, suffix=''):
     try:
         os.write(fd, reader())
         os.close(fd)
-        del reader
         yield Path(raw_path)
     finally:
         try:
@@ -109,11 +108,15 @@ def as_file(path):
     Given a Traversable object, return that object as a
     path on the local file system in a context manager.
     """
-    reader = path.read_bytes
-    with _tempfile(reader, suffix=path.name) as local:
-        # release the handle to the path and reader
-        del reader
-        del path
+    content = path.read_bytes()
+    name = path.name
+
+    def reader():
+        return content
+
+    del path.root
+    del path
+    with _tempfile(reader, suffix=name) as local:
         yield local
 
 

importlib_resources/_py3.py

@@ -96,11 +96,18 @@ def path(
     return (
         _path_from_reader(reader, resource)
         if reader else
-        _common.as_file(
-            _common.files(package).joinpath(_common.normalize_path(resource)))
+        _fallback_path(package, resource)
         )
 
 
+@contextmanager
+def _fallback_path(package, resource):
+    files = _common.files(package).joinpath(_common.normalize_path(resource))
+    with _common.as_file(files) as res:
+        del files
+        yield res
+
+
 @contextmanager
 def _path_from_reader(reader, resource):
     norm_resource = _common.normalize_path(resource)

tox.ini

@@ -6,8 +6,8 @@ skip_missing_interpreters = True
 
 [testenv]
 commands =
-    !cov,!diffcov: python -m unittest discover
-    cov,diffcov: python -m coverage run {[coverage]rc} -m unittest discover {posargs}
+    !cov,!diffcov: python -m unittest {posargs:discover}
+    cov,diffcov: python -m coverage run {[coverage]rc} -m unittest {posargs:posargs}
     cov,diffcov: python -m coverage combine {[coverage]rc}
     cov: python -m coverage html {[coverage]rc}
     cov: python -m coverage xml {[coverage]rc}