A few more Python>=3.8 simplifications

doc/en/how-to/failures.rst

@@ -135,10 +135,6 @@ Warning about unraisable exceptions and unhandled thread exceptions
 
 .. versionadded:: 6.2
 
-.. note::
-
-    These features only work on Python>=3.8.
-
 Unhandled exceptions are exceptions that are raised in a situation in which
 they cannot propagate to a caller. The most common case is an exception raised
 in a :meth:`__del__ <object.__del__>` implementation.

src/_pytest/_code/code.py

@@ -393,11 +393,11 @@ class Traceback(List[TracebackEntry]):
 
     def filter(
         self,
-        # TODO(py38): change to positional only.
+        excinfo_or_fn: Union[
-        _excinfo_or_fn: Union[
             "ExceptionInfo[BaseException]",
             Callable[[TracebackEntry], bool],
         ],
+        /,
     ) -> "Traceback":
         """Return a Traceback instance with certain items removed.
 
@@ -408,10 +408,10 @@ class Traceback(List[TracebackEntry]):
         ``TracebackEntry`` instance, and should return True when the item should
         be added to the ``Traceback``, False when not.
         """
-        if isinstance(_excinfo_or_fn, ExceptionInfo):
+        if isinstance(excinfo_or_fn, ExceptionInfo):
-            fn = lambda x: not x.ishidden(_excinfo_or_fn)  # noqa: E731
+            fn = lambda x: not x.ishidden(excinfo_or_fn)  # noqa: E731
         else:
-            fn = _excinfo_or_fn
+            fn = excinfo_or_fn
         return Traceback(filter(fn, self))
 
     def recursionindex(self) -> Optional[int]:

src/_pytest/pathlib.py

@@ -769,21 +769,3 @@ def bestrelpath(directory: Path, dest: Path) -> str:
         # Forward from base to dest.
         *reldest.parts,
     )
-
-
-# Originates from py. path.local.copy(), with siginficant trims and adjustments.
-# TODO(py38): Replace with shutil.copytree(..., symlinks=True, dirs_exist_ok=True)
-def copytree(source: Path, target: Path) -> None:
-    """Recursively copy a source directory to target."""
-    assert source.is_dir()
-    for entry in visit(source, recurse=lambda entry: not entry.is_symlink()):
-        x = Path(entry)
-        relpath = x.relative_to(source)
-        newx = target / relpath
-        newx.parent.mkdir(exist_ok=True)
-        if x.is_symlink():
-            newx.symlink_to(os.readlink(x))
-        elif x.is_file():
-            shutil.copyfile(x, newx)
-        elif x.is_dir():
-            newx.mkdir(exist_ok=True)

src/_pytest/pytester.py

@@ -63,7 +63,6 @@ from _pytest.outcomes import fail
 from _pytest.outcomes import importorskip
 from _pytest.outcomes import skip
 from _pytest.pathlib import bestrelpath
-from _pytest.pathlib import copytree
 from _pytest.pathlib import make_numbered_dir
 from _pytest.reports import CollectReport
 from _pytest.reports import TestReport
@@ -971,7 +970,7 @@ class Pytester:
             example_path = example_dir.joinpath(name)
 
         if example_path.is_dir() and not example_path.joinpath("__init__.py").is_file():
-            copytree(example_path, self.path)
+            shutil.copytree(example_path, self.path, symlinks=True, dirs_exist_ok=True)
             return self.path
         elif example_path.is_file():
             result = self.path.joinpath(example_path.name)