bpo-44095: Add suffix, stem and suffixes to zipfile.Path

Doc/library/zipfile.rst

@@ -521,6 +521,27 @@ Path objects are traversable using the ``/`` operator or ``joinpath``.
    Return ``True`` if the current context references a file or
    directory in the zip file.
 
+.. data:: Path.suffix
+
+   The file extension of the final component.
+
+   .. versionadded:: 3.11
+      Added :data:`Path.suffix` property.
+
+.. data:: Path.stem
+
+   The final path component, without its suffix.
+
+   .. versionadded:: 3.11
+      Added :data:`Path.stem` property.
+
+.. data:: Path.suffixes
+
+   A list of the path’s file extensions.
+
+   .. versionadded:: 3.11
+      Added :data:`Path.suffixes` property.
+
 .. method:: Path.read_text(*, **)
 
    Read the current file as unicode text. Positional and

Lib/test/test_zipfile.py

@@ -3093,6 +3093,64 @@ def test_root_name(self, alpharep):
         root = zipfile.Path(alpharep)
         assert root.name == 'alpharep.zip' == root.filename.name
 
+    @pass_alpharep
+    def test_suffix(self, alpharep):
+        """
+        The suffix of the root should be the suffix of the zipfile.
+        The suffix of each nested file is the final component's last suffix, if any.
+        Includes the leading period, just like pathlib.Path.
+        """
+        root = zipfile.Path(alpharep)
+        assert root.suffix == '.zip' == root.filename.suffix
+
+        b = root / "b.txt"
+        assert b.suffix == ".txt"
+
+        c = root / "c" / "filename.tar.gz"
+        assert c.suffix == ".gz"
+
+        d = root / "d"
+        assert d.suffix == ""
+
+    @pass_alpharep
+    def test_suffixes(self, alpharep):
+        """
+        The suffix of the root should be the suffix of the zipfile.
+        The suffix of each nested file is the final component's last suffix, if any.
+        Includes the leading period, just like pathlib.Path.
+        """
+        root = zipfile.Path(alpharep)
+        assert root.suffixes == ['.zip'] == root.filename.suffixes
+
+        b = root / 'b.txt'
+        assert b.suffixes == ['.txt']
+
+        c = root / 'c' / 'filename.tar.gz'
+        assert c.suffixes == ['.tar', '.gz']
+
+        d = root / 'd'
+        assert d.suffixes == []
+
+        e = root / '.hgrc'
+        assert e.suffixes == []
+
+    @pass_alpharep
+    def test_stem(self, alpharep):
+        """
+        The final path component, without its suffix
+        """
+        root = zipfile.Path(alpharep)
+        assert root.stem == 'alpharep' == root.filename.stem
+
+        b = root / "b.txt"
+        assert b.stem == "b"
+
+        c = root / "c" / "filename.tar.gz"
+        assert c.stem == "filename.tar"
+
+        d = root / "d"
+        assert d.stem == "d"
+
     @pass_alpharep
     def test_root_parent(self, alpharep):
         root = zipfile.Path(alpharep)

Lib/zipfile.py

@@ -2342,6 +2342,18 @@ def open(self, mode='r', *args, pwd=None, **kwargs):
     def name(self):
         return pathlib.Path(self.at).name or self.filename.name
 
+    @property
+    def suffix(self):
+        return pathlib.Path(self.at).suffix or self.filename.suffix
+
+    @property
+    def suffixes(self):
+        return pathlib.Path(self.at).suffixes or self.filename.suffixes
+
+    @property
+    def stem(self):
+        return pathlib.Path(self.at).stem or self.filename.stem
+
     @property
     def filename(self):
         return pathlib.Path(self.root.filename).joinpath(self.at)

Misc/NEWS.d/next/Library/2021-05-14-16-06-02.bpo-44095.v_pLwY.rst

@@ -0,0 +1,2 @@
+:class:`zipfile.Path` now supports :attr:`zipfile.Path.stem`,
+:attr:`zipfile.Path.suffixes`, and :attr:`zipfile.Path.suffix` attributes.