[wip] implement Node.path as pathlib.Path

there is a bug in module collection left that i dont see tonight, lets retry tommorow

src/_pytest/cacheprovider.py

@@ -220,12 +220,12 @@ def pytest_make_collect_report(self, collector: nodes.Collector):
             lf_paths = self.lfplugin._last_failed_paths
             res.result = sorted(
                 res.result,
-                key=lambda x: 0 if Path(str(x.fspath)) in lf_paths else 1,
+                key=lambda x: x.path not in lf_paths,
             )
             return
 
         elif isinstance(collector, Module):
-            if Path(str(collector.fspath)) in self.lfplugin._last_failed_paths:
+            if collector.path in self.lfplugin._last_failed_paths:
                 out = yield
                 res = out.get_result()
                 result = res.result
@@ -246,7 +246,7 @@ def pytest_make_collect_report(self, collector: nodes.Collector):
                     for x in result
                     if x.nodeid in lastfailed
                     # Include any passed arguments (not trivial to filter).
-                    or session.isinitpath(x.fspath)
+                    or session.isinitpath(x.path)
                     # Keep all sub-collectors.
                     or isinstance(x, nodes.Collector)
                 ]
@@ -266,7 +266,7 @@ def pytest_make_collect_report(
         # test-bearing paths and doesn't try to include the paths of their
         # packages, so don't filter them.
         if isinstance(collector, Module) and not isinstance(collector, Package):
-            if Path(str(collector.fspath)) not in self.lfplugin._last_failed_paths:
+            if collector.path not in self.lfplugin._last_failed_paths:
                 self.lfplugin._skipped_files += 1
 
                 return CollectReport(
@@ -415,7 +415,7 @@ def pytest_collection_modifyitems(
             self.cached_nodeids.update(item.nodeid for item in items)
 
     def _get_increasing_order(self, items: Iterable[nodes.Item]) -> List[nodes.Item]:
-        return sorted(items, key=lambda item: item.fspath.mtime(), reverse=True)
+        return sorted(items, key=lambda item: item.path.stat().st_mtime, reverse=True)  # type: ignore[no-any-return]
 
     def pytest_sessionfinish(self) -> None:
         config = self.config

src/_pytest/compat.py

@@ -2,6 +2,7 @@
 import enum
 import functools
 import inspect
+import os
 import re
 import sys
 from contextlib import contextmanager
@@ -18,6 +19,7 @@
 from typing import Union
 
 import attr
+import py
 
 from _pytest.outcomes import fail
 from _pytest.outcomes import TEST_OUTCOME
@@ -30,6 +32,16 @@
 _T = TypeVar("_T")
 _S = TypeVar("_S")
 
+#: constant to prepare valuing py.path.local replacements/lazy proxies later on
+#  intended for removal in pytest 8.0 or 9.0
+
+LEGACY_PATH = py.path.local
+
+
+def legacy_path(path: Union[str, "os.PathLike[str]"]) -> LEGACY_PATH:
+    """Internal wrapper to prepare lazy proxies for py.path.local instances"""
+    return py.path.local(path)
+
 
 # fmt: off
 # Singleton type for NOTSET, as described in:

src/_pytest/deprecated.py

@@ -89,6 +89,12 @@
 )
 
 
+NODE_FSPATH = UnformattedWarning(
+    PytestDeprecationWarning,
+    "{type}.fspath is deprecated and will be replaced by {type}.path.\n"
+    "see TODO;URL for details on replacing py.path.local with pathlib.Path",
+)
+
 # You want to make some `__init__` or function "private".
 #
 #   def my_private_function(some, args):
@@ -106,6 +112,8 @@
 #
 # All other calls will get the default _ispytest=False and trigger
 # the warning (possibly error in the future).
+
+
 def check_ispytest(ispytest: bool) -> None:
     if not ispytest:
         warn(PRIVATE, stacklevel=3)

src/_pytest/doctest.py

@@ -30,6 +30,7 @@
 from _pytest._code.code import ReprFileLocation
 from _pytest._code.code import TerminalRepr
 from _pytest._io import TerminalWriter
+from _pytest.compat import legacy_path
 from _pytest.compat import safe_getattr
 from _pytest.config import Config
 from _pytest.config.argparsing import Parser
@@ -128,10 +129,10 @@ def pytest_collect_file(
     config = parent.config
     if fspath.suffix == ".py":
         if config.option.doctestmodules and not _is_setup_py(fspath):
-            mod: DoctestModule = DoctestModule.from_parent(parent, fspath=path)
+            mod: DoctestModule = DoctestModule.from_parent(parent, path=fspath)
             return mod
     elif _is_doctest(config, fspath, parent):
-        txt: DoctestTextfile = DoctestTextfile.from_parent(parent, fspath=path)
+        txt: DoctestTextfile = DoctestTextfile.from_parent(parent, path=fspath)
         return txt
     return None
 
@@ -378,7 +379,7 @@ def repr_failure(  # type: ignore[override]
 
     def reportinfo(self):
         assert self.dtest is not None
-        return self.fspath, self.dtest.lineno, "[doctest] %s" % self.name
+        return legacy_path(self.path), self.dtest.lineno, "[doctest] %s" % self.name
 
 
 def _get_flag_lookup() -> Dict[str, int]:
@@ -425,9 +426,9 @@ def collect(self) -> Iterable[DoctestItem]:
         # Inspired by doctest.testfile; ideally we would use it directly,
         # but it doesn't support passing a custom checker.
         encoding = self.config.getini("doctest_encoding")
-        text = self.fspath.read_text(encoding)
-        filename = str(self.fspath)
-        name = self.fspath.basename
+        text = self.path.read_text(encoding)
+        filename = str(self.path)
+        name = self.path.name
         globs = {"__name__": "__main__"}
 
         optionflags = get_optionflags(self)
@@ -534,16 +535,16 @@ def _find(
                         self, tests, obj, name, module, source_lines, globs, seen
                     )
 
-        if self.fspath.basename == "conftest.py":
+        if self.path.name == "conftest.py":
             module = self.config.pluginmanager._importconftest(
-                Path(self.fspath), self.config.getoption("importmode")
+                self.path, self.config.getoption("importmode")
             )
         else:
             try:
-                module = import_path(self.fspath)
+                module = import_path(self.path)
             except ImportError:
                 if self.config.getvalue("doctest_ignore_import_errors"):
-                    pytest.skip("unable to import module %r" % self.fspath)
+                    pytest.skip("unable to import module %r" % self.path)
                 else:
                     raise
         # Uses internal doctest module parsing mechanism.

src/_pytest/fixtures.py

@@ -28,7 +28,6 @@
 from typing import Union
 
 import attr
-import py
 
 import _pytest
 from _pytest import nodes
@@ -46,13 +45,16 @@
 from _pytest.compat import getimfunc
 from _pytest.compat import getlocation
 from _pytest.compat import is_generator
+from _pytest.compat import LEGACY_PATH
+from _pytest.compat import legacy_path
 from _pytest.compat import NOTSET
 from _pytest.compat import safe_getattr
 from _pytest.config import _PluggyPlugin
 from _pytest.config import Config
 from _pytest.config.argparsing import Parser
 from _pytest.deprecated import check_ispytest
 from _pytest.deprecated import FILLFUNCARGS
+from _pytest.deprecated import NODE_FSPATH
 from _pytest.deprecated import YIELD_FIXTURE
 from _pytest.mark import Mark
 from _pytest.mark import ParameterSet
@@ -256,12 +258,12 @@ def get_parametrized_fixture_keys(item: nodes.Item, scopenum: int) -> Iterator[_
             if scopenum == 0:  # session
                 key: _Key = (argname, param_index)
             elif scopenum == 1:  # package
-                key = (argname, param_index, item.fspath.dirpath())
+                key = (argname, param_index, item.path.parent)
             elif scopenum == 2:  # module
-                key = (argname, param_index, item.fspath)
+                key = (argname, param_index, item.path)
             elif scopenum == 3:  # class
                 item_cls = item.cls  # type: ignore[attr-defined]
-                key = (argname, param_index, item.fspath, item_cls)
+                key = (argname, param_index, item.path, item_cls)
             yield key
 
 
@@ -519,12 +521,17 @@ def module(self):
         return self._pyfuncitem.getparent(_pytest.python.Module).obj
 
     @property
-    def fspath(self) -> py.path.local:
-        """The file system path of the test module which collected this test."""
+    def fspath(self) -> LEGACY_PATH:
+        """(deprecated) The file system path of the test module which collected this test."""
+        warnings.warn(NODE_FSPATH.format(type=type(self).__name__), stacklevel=2)
+        return legacy_path(self.path)
+
+    @property
+    def path(self) -> Path:
         if self.scope not in ("function", "class", "module", "package"):
             raise AttributeError(f"module not available in {self.scope}-scoped context")
         # TODO: Remove ignore once _pyfuncitem is properly typed.
-        return self._pyfuncitem.fspath  # type: ignore
+        return self._pyfuncitem.path  # type: ignore
 
     @property
     def keywords(self) -> MutableMapping[str, Any]:
@@ -1040,7 +1047,7 @@ def finish(self, request: SubRequest) -> None:
             if exc:
                 raise exc
         finally:
-            hook = self._fixturemanager.session.gethookproxy(request.node.fspath)
+            hook = self._fixturemanager.session.gethookproxy(request.node.path)
             hook.pytest_fixture_post_finalizer(fixturedef=self, request=request)
             # Even if finalization fails, we invalidate the cached fixture
             # value and remove all finalizers because they may be bound methods
@@ -1075,7 +1082,7 @@ def execute(self, request: SubRequest) -> _FixtureValue:
             self.finish(request)
             assert self.cached_result is None
 
-        hook = self._fixturemanager.session.gethookproxy(request.node.fspath)
+        hook = self._fixturemanager.session.gethookproxy(request.node.path)
         result = hook.pytest_fixture_setup(fixturedef=self, request=request)
         return result
 

src/_pytest/main.py

@@ -464,7 +464,12 @@ class Session(nodes.FSCollector):
 
     def __init__(self, config: Config) -> None:
         super().__init__(
-            config.rootdir, parent=None, config=config, session=self, nodeid=""
+            path=config.rootpath,
+            fspath=config.rootdir,
+            parent=None,
+            config=config,
+            session=self,
+            nodeid="",
         )
         self.testsfailed = 0
         self.testscollected = 0
@@ -688,7 +693,7 @@ def collect(self) -> Iterator[Union[nodes.Item, nodes.Collector]]:
                             if col:
                                 if isinstance(col[0], Package):
                                     pkg_roots[str(parent)] = col[0]
-                                node_cache1[Path(col[0].fspath)] = [col[0]]
+                                node_cache1[col[0].path] = [col[0]]
 
             # If it's a directory argument, recurse and look for any Subpackages.
             # Let the Package collector deal with subnodes, don't collect here.
@@ -717,7 +722,7 @@ def collect(self) -> Iterator[Union[nodes.Item, nodes.Collector]]:
                         continue
 
                     for x in self._collectfile(path):
-                        key2 = (type(x), Path(x.fspath))
+                        key2 = (type(x), x.path)
                         if key2 in node_cache2:
                             yield node_cache2[key2]
                         else: