Add Python 3.13 (beta1) support

.github/workflows/test.yml

@@ -55,6 +55,7 @@ jobs:
           "windows-py310",
           "windows-py311",
           "windows-py312",
+          "windows-py313",
 
           "ubuntu-py38",
           "ubuntu-py38-pluggy",
@@ -63,12 +64,14 @@ jobs:
           "ubuntu-py310",
           "ubuntu-py311",
           "ubuntu-py312",
+          "ubuntu-py313",
           "ubuntu-pypy3",
 
           "macos-py38",
           "macos-py39",
           "macos-py310",
           "macos-py312",
+          "macos-py313",
 
           "doctesting",
           "plugins",
@@ -97,9 +100,13 @@ jobs:
             os: windows-latest
             tox_env: "py311"
           - name: "windows-py312"
-            python: "3.12-dev"
+            python: "3.12"
             os: windows-latest
             tox_env: "py312"
+          - name: "windows-py313"
+            python: "3.13-dev"
+            os: windows-latest
+            tox_env: "py313"
 
           - name: "ubuntu-py38"
             python: "3.8"
@@ -128,10 +135,15 @@ jobs:
             tox_env: "py311"
             use_coverage: true
           - name: "ubuntu-py312"
-            python: "3.12-dev"
+            python: "3.12"
             os: ubuntu-latest
             tox_env: "py312"
             use_coverage: true
+          - name: "ubuntu-py313"
+            python: "3.13-dev"
+            os: ubuntu-latest
+            tox_env: "py313"
+            use_coverage: true
           - name: "ubuntu-pypy3"
             python: "pypy-3.8"
             os: ubuntu-latest
@@ -151,9 +163,13 @@ jobs:
             os: macos-latest
             tox_env: "py310-xdist"
           - name: "macos-py312"
-            python: "3.12-dev"
+            python: "3.12"
             os: macos-latest
             tox_env: "py312-xdist"
+          - name: "macos-py313"
+            python: "3.13-dev"
+            os: macos-latest
+            tox_env: "py313-xdist"
 
           - name: "plugins"
             python: "3.12"

changelog/12334.improvement.rst

@@ -0,0 +1 @@
+Support for Python 3.13 (beta1 at the time of writing).

pyproject.toml

@@ -31,6 +31,7 @@ classifiers = [
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Topic :: Software Development :: Libraries",
     "Topic :: Software Development :: Testing",
     "Topic :: Utilities",

src/_pytest/_code/code.py

@@ -424,15 +424,14 @@ class Traceback(List[TracebackEntry]):
             # which generates code objects that have hash/value equality
             # XXX needs a test
             key = entry.frame.code.path, id(entry.frame.code.raw), entry.lineno
-            # print "checking for recursion at", key
             values = cache.setdefault(key, [])
+            # Since Python 3.13 f_locals is a proxy, freeze it.
+            loc = dict(entry.frame.f_locals)
             if values:
-                f = entry.frame
-                loc = f.f_locals
                 for otherloc in values:
                     if otherloc == loc:
                         return i
-            values.append(entry.frame.f_locals)
+            values.append(loc)
         return None
 
 

src/_pytest/pytester.py

@@ -289,7 +289,8 @@ class HookRecorder:
         __tracebackhide__ = True
         i = 0
         entries = list(entries)
-        backlocals = sys._getframe(1).f_locals
+        # Since Python 3.13, f_locals is not a dict, but eval requires a dict.
+        backlocals = dict(sys._getframe(1).f_locals)
         while entries:
             name, check = entries.pop(0)
             for ind, call in enumerate(self.calls[i:]):
@@ -760,6 +761,9 @@ class Pytester:
     ) -> Path:
         items = list(files.items())
 
+        if ext is None:
+            raise TypeError("ext must not be None")
+
         if ext and not ext.startswith("."):
             raise ValueError(
                 f"pytester.makefile expects a file extension, try .{ext} instead of {ext}"

testing/code/test_excinfo.py

@@ -1,6 +1,7 @@
 # mypy: allow-untyped-defs
 from __future__ import annotations
 
+import fnmatch
 import importlib
 import io
 import operator
@@ -237,7 +238,7 @@ class TestTraceback_f_g_h:
                 n += 1
             f(n)
 
-        excinfo = pytest.raises(RuntimeError, f, 8)
+        excinfo = pytest.raises(RecursionError, f, 8)
         traceback = excinfo.traceback
         recindex = traceback.recursionindex()
         assert recindex == 3
@@ -373,7 +374,10 @@ def test_excinfo_no_sourcecode():
     except ValueError:
         excinfo = _pytest._code.ExceptionInfo.from_current()
     s = str(excinfo.traceback[-1])
-    assert s == "  File '<string>':1 in <module>\n  ???\n"
+    # TODO: Since Python 3.13b1 under pytest-xdist, the * is `import
+    # sys;exec(eval(sys.stdin.readline()))` (execnet bootstrap code)
+    # instead of `???` like before. Is this OK?
+    fnmatch.fnmatch(s, "  File '<string>':1 in <module>\n  *\n")
 
 
 def test_excinfo_no_python_sourcecode(tmp_path: Path) -> None:

testing/code/test_source.py

@@ -370,7 +370,11 @@ def test_getfslineno() -> None:
         pass
 
     B.__name__ = B.__qualname__ = "B2"
-    assert getfslineno(B)[1] == -1
+    # Since Python 3.13 this started working.
+    if sys.version_info >= (3, 13):
+        assert getfslineno(B)[1] != -1
+    else:
+        assert getfslineno(B)[1] == -1
 
 
 def test_code_of_object_instance_with_call() -> None:

testing/test_cacheprovider.py

@@ -194,7 +194,7 @@ class TestNewAPI:
         assert pytester.path.joinpath("custom_cache_dir").is_dir()
 
 
-@pytest.mark.parametrize("env", ((), ("TOX_ENV_DIR", "/tox_env_dir")))
+@pytest.mark.parametrize("env", ((), ("TOX_ENV_DIR", "mydir/tox-env")))
 def test_cache_reportheader(
     env: Sequence[str], pytester: Pytester, monkeypatch: MonkeyPatch
 ) -> None:

testing/test_doctest.py

@@ -1,6 +1,7 @@
 # mypy: allow-untyped-defs
 import inspect
 from pathlib import Path
+import sys
 import textwrap
 from typing import Callable
 from typing import Optional
@@ -223,6 +224,7 @@ class TestDoctests:
                 "Traceback (most recent call last):",
                 '  File "*/doctest.py", line *, in __run',
                 "    *",
+                *((" *^^^^*", " *", " *") if sys.version_info >= (3, 13) else ()),
                 '  File "<doctest test_doctest_unexpected_exception.txt[1]>", line 1, in <module>',
                 "ZeroDivisionError: division by zero",
                 "*/test_doctest_unexpected_exception.txt:2: UnexpectedException",
@@ -379,7 +381,7 @@ class TestDoctests:
                 "*= FAILURES =*",
                 "*_ [[]doctest[]] test_doctest_linedata_on_property.Sample.some_property _*",
                 "004 ",
-                "005         >>> Sample().some_property",
+                "005 *>>> Sample().some_property",
                 "Expected:",
                 "    'another thing'",
                 "Got:",

tox.ini

@@ -9,6 +9,7 @@ envlist =
     py310
     py311
     py312
+    py313
     pypy3
     py38-{pexpect,xdist,unittestextras,numpy,pluggymain,pylib}
     doctesting