refactor: remove _pytestfixturefunction attribute

src/_pytest/assertion/rewrite.py

@@ -462,7 +462,7 @@ def _format_assertmsg(obj: object) -> str:
 
 def _should_repr_global_name(obj: object) -> bool:
     if callable(obj):
-        return hasattr(obj, "_pytestfixturefunction")
+        return hasattr(obj, "_fixture_function_marker")
 
     try:
         return not hasattr(obj, "__name__")

src/_pytest/compat.py

@@ -217,7 +217,7 @@ def get_real_func(obj):
     start_obj = obj
     for _ in range(100):
         if isinstance(obj, FixtureFunctionDefinition):
-            obj = obj.get_real_func()
+            obj = obj._get_wrapped_function()
             break
         new_obj = getattr(obj, "__wrapped__", None)
         if new_obj is None:

src/_pytest/fixtures.py

@@ -155,7 +155,7 @@ def getfixturemarker(obj: object) -> Optional["FixtureFunctionMarker"]:
     exceptions."""
     return cast(
         Optional[FixtureFunctionMarker],
-        safe_getattr(obj, "_pytestfixturefunction", None),
+        safe_getattr(obj, "_fixture_function_marker", None),
     )
 
 
@@ -1193,7 +1193,7 @@ class FixtureFunctionDefinition:
 
     def __init__(
         self,
-        function: Callable[..., object],
+        function: Callable[..., Any],
         fixture_function_marker: FixtureFunctionMarker,
         instance: Optional[type] = None,
     ):
@@ -1202,17 +1202,16 @@ class FixtureFunctionDefinition:
         # This attribute is only used to check if an arbitrary python object is a fixture.
         # Using isinstance on every object in code might execute code that is not intended to be executed.
         # Like lazy loaded classes.
-        self._pytestfixturefunction = fixture_function_marker
-        self.fixture_function_marker = fixture_function_marker
-        self.fixture_function = function
-        self.instance = instance
+        self._fixture_function_marker = fixture_function_marker
+        self._fixture_function = function
+        self._instance = instance
 
     def __repr__(self) -> str:
-        return f"pytest_fixture({self.fixture_function})"
+        return f"pytest_fixture({self._fixture_function})"
 
     def __get__(self, instance, owner=None):
         return FixtureFunctionDefinition(
-            self.fixture_function, self.fixture_function_marker, instance
+            self._fixture_function, self._fixture_function_marker, instance
         )
 
     def __call__(self, *args: Any, **kwds: Any) -> Any:
@@ -1224,10 +1223,10 @@ class FixtureFunctionDefinition:
         )
         fail(message, pytrace=False)
 
-    def get_real_func(self):
-        if self.instance is not None:
-            return self.fixture_function.__get__(self.instance)
-        return self.fixture_function
+    def _get_wrapped_function(self):
+        if self._instance is not None:
+            return self._fixture_function.__get__(self._instance)
+        return self._fixture_function
 
 
 @overload
@@ -1769,7 +1768,7 @@ class FixtureManager:
             if isinstance(obj, FixtureFunctionDefinition):
                 if marker.name:
                     name = marker.name
-                func = obj.get_real_func()
+                func = obj._get_wrapped_function()
                 self._register_fixture(
                     name=name,
                     nodeid=nodeid,

testing/code/test_source.py

@@ -481,7 +481,7 @@ def test_source_with_decorator() -> None:
     # Since deco_fixture is now an instance of FixtureFunctionDef the getsource function will not work on it.
     with pytest.raises(Exception):
         inspect.getsource(deco_fixture)
-    src = inspect.getsource(deco_fixture.get_real_func())
+    src = inspect.getsource(deco_fixture._get_wrapped_function())
     assert src == "    @pytest.fixture\n    def deco_fixture():\n        assert False\n"
     # Make sure the decorator is not a wrapped function
     assert not str(Source(deco_fixture)).startswith("@functools.wraps(function)")

testing/test_compat.py

@@ -83,7 +83,7 @@ def test_get_real_func() -> None:
         pass
 
     wrapped_func4 = decorator(wrapped_func3)
-    assert get_real_func(wrapped_func4) is wrapped_func3.get_real_func()
+    assert get_real_func(wrapped_func4) is wrapped_func3._get_wrapped_function()
 
 
 def test_get_real_func_partial() -> None: