Fix task key comp

src/prefect/tasks.py

@@ -206,8 +206,17 @@ def _generate_task_key(fn: Callable[..., Any]) -> str:
 
     qualname = fn.__qualname__.split(".")[-1]
 
+    try:
+        code_obj = getattr(fn, "__code__", None)
+        if code_obj is None:
+            code_obj = fn.__call__.__code__
+    except AttributeError:
+        raise AttributeError(
+            f"{fn} is not a standard Python function object and could not be converted to a task."
+        ) from None
+
     code_hash = (
-        h[:NUM_CHARS_DYNAMIC_KEY] if (h := hash_objects(fn.__code__)) else "unknown"
+        h[:NUM_CHARS_DYNAMIC_KEY] if (h := hash_objects(code_obj)) else "unknown"
     )
 
     return f"{qualname}-{code_hash}"

tests/test_tasks.py

@@ -117,6 +117,21 @@ def test_task_key_after_import(self):
 
         assert noop.task_key.startswith("noop-")
 
+    def test_task_key_with_funky_class(self):
+        class Funky:
+            def __call__(self, x):
+                return x
+
+        # set up class to trigger certain code path
+        # see https://github.com/PrefectHQ/prefect/issues/15058
+        funky = Funky()
+        funky.__qualname__ = "__main__.Funky"
+        if hasattr(funky, "__code__"):
+            del funky.__code__
+
+        tt = task(funky)
+        assert tt.task_key.startswith("Funky-")
+
 
 class TestTaskRunName:
     def test_run_name_default(self):