-        if sys.version_info.major == 2:
-            arg_names = inspect.getargspec(func).args
-        else:
-            arg_names = inspect.getfullargspec(func).args
+        arg_names = inspect.getfullargspec(func).args

-            def __nonzero__(self):
-                """Python 2"""
-                raise NotImplementedError("Casting to boolean is not allowed")

+        @dataclasses.dataclass
         class SomeClass:
-            def __init__(self, another_object: AnotherClass):
-                self.another_object = another_object
+            another_object: AnotherClass

-if _HAS_PEP604_SUPPORT:
-    _HAS_PEP560_SUPPORT = True
-else:
-    _HAS_PEP560_SUPPORT = sys.version_info[:3] >= (3, 7, 0)  # PEP 560
+_HAS_PEP560_SUPPORT = _HAS_PEP604_SUPPORT or sys.version_info[:3] >= (3, 7, 0)