config: add Config.{rootpath,inipath}, turn Config.{rootdir,inifile} to properties

changelog/7685.improvement.rst

@@ -0,0 +1,3 @@
+Added two new attributes :attr:`rootpath <_pytest.config.Config.rootpath>` and :attr:`inipath <_pytest.config.Config.inipath>` to :class:`Config <_pytest.config.Config>`.
+These attributes are :class:`pathlib.Path` versions of the existing :attr:`rootdir <_pytest.config.Config.rootdir>` and :attr:`inifile <_pytest.config.Config.inifile>` attributes,
+and should be preferred over them when possible.

doc/en/customize.rst

@@ -180,10 +180,15 @@ are never merged - the first match wins.
 The internal :class:`Config <_pytest.config.Config>` object (accessible via hooks or through the :fixture:`pytestconfig` fixture)
 will subsequently carry these attributes:
 
-- ``config.rootdir``: the determined root directory, guaranteed to exist.
+- :attr:`config.rootpath <_pytest.config.Config.rootpath>`: the determined root directory, guaranteed to exist.
 
-- ``config.inifile``: the determined ``configfile``, may be ``None`` (it is named ``inifile``
+- :attr:`config.inipath <_pytest.config.Config.inipath>`: the determined ``configfile``, may be ``None``
-  for historical reasons).
+  (it is named ``inipath`` for historical reasons).
+
+.. versionadded:: 6.1
+    The ``config.rootpath`` and ``config.inipath`` properties. They are :class:`pathlib.Path`
+    versions of the older ``config.rootdir`` and ``config.inifile``, which have type
+    ``py.path.local``, and still exist for backward compatibility.
 
 The ``rootdir`` is used as a reference directory for constructing test
 addresses ("nodeids") and can be used also by plugins for storing

src/_pytest/config/__init__.py

@@ -916,12 +916,53 @@ class Config:
     def invocation_dir(self) -> py.path.local:
         """The directory from which pytest was invoked.
 
-        Prefer to use :attr:`invocation_params.dir <InvocationParams.dir>`.
+        Prefer to use :attr:`invocation_params.dir <InvocationParams.dir>`,
+        which is a :class:`pathlib.Path`.
 
         :type: py.path.local
         """
         return py.path.local(str(self.invocation_params.dir))
 
+    @property
+    def rootpath(self) -> Path:
+        """The path to the :ref:`rootdir <rootdir>`.
+
+        :type: pathlib.Path
+
+        .. versionadded:: 6.1
+        """
+        return self._rootpath
+
+    @property
+    def rootdir(self) -> py.path.local:
+        """The path to the :ref:`rootdir <rootdir>`.
+
+        Prefer to use :attr:`rootpath`, which is a :class:`pathlib.Path`.
+
+        :type: py.path.local
+        """
+        return py.path.local(str(self.rootpath))
+
+    @property
+    def inipath(self) -> Optional[Path]:
+        """The path to the :ref:`configfile <configfiles>`.
+
+        :type: Optional[pathlib.Path]
+
+        .. versionadded:: 6.1
+        """
+        return self._inipath
+
+    @property
+    def inifile(self) -> Optional[py.path.local]:
+        """The path to the :ref:`configfile <configfiles>`.
+
+        Prefer to use :attr:`inipath`, which is a :class:`pathlib.Path`.
+
+        :type: Optional[py.path.local]
+        """
+        return py.path.local(str(self.inipath)) if self.inipath else None
+
     def add_cleanup(self, func: Callable[[], None]) -> None:
         """Add a function to be called when the config object gets out of
         use (usually coninciding with pytest_unconfigure)."""
@@ -1032,8 +1073,8 @@ class Config:
             rootdir_cmd_arg=ns.rootdir or None,
             config=self,
         )
-        self.rootdir = py.path.local(str(rootpath))
+        self._rootpath = rootpath
-        self.inifile = py.path.local(str(inipath)) if inipath else None
+        self._inipath = inipath
         self.inicfg = inicfg
         self._parser.extra_info["rootdir"] = self.rootdir
         self._parser.extra_info["inifile"] = self.inifile