bpo-32279: Add additional params to make_dataclass(), pass through to dataclass(). (gh-5117)

Author: ericvsmith

Lib/dataclasses.py

@@ -705,7 +705,8 @@ def _astuple_inner(obj, tuple_factory):
         return deepcopy(obj)
 
 
-def make_dataclass(cls_name, fields, *, bases=(), namespace=None):
+def make_dataclass(cls_name, fields, *, bases=(), namespace=None, init=True,
+                   repr=True, eq=True, order=False, hash=None, frozen=False):
     """Return a new dynamically created dataclass.
 
     The dataclass name will be 'cls_name'.  'fields' is an iterable
@@ -723,6 +724,9 @@ class C(Base):
           b: int = field(init=False)
 
     For the bases and namespace paremeters, see the builtin type() function.
+
+    The parameters init, repr, eq, order, hash, and frozen are passed to
+    dataclass().
     """
 
     if namespace is None:
@@ -745,8 +749,8 @@ class C(Base):
 
     namespace['__annotations__'] = anns
     cls = type(cls_name, bases, namespace)
-    return dataclass(cls)
-
+    return dataclass(cls, init=init, repr=repr, eq=eq, order=order,
+                     hash=hash, frozen=frozen)
 
 def replace(obj, **changes):
     """Return a new object replacing specified fields with new values.

Lib/test/test_dataclasses.py

@@ -2033,6 +2033,23 @@ def test_helper_make_dataclass_class_var(self):
         self.assertEqual(C.y, 10)
         self.assertEqual(C.z, 20)
 
+    def test_helper_make_dataclass_other_params(self):
+        C = make_dataclass('C',
+                           [('x', int),
+                            ('y', ClassVar[int], 10),
+                            ('z', ClassVar[int], field(default=20)),
+                            ],
+                           init=False)
+        # Make sure we have a repr, but no init.
+        self.assertNotIn('__init__', vars(C))
+        self.assertIn('__repr__', vars(C))
+
+        # Make sure random other params don't work.
+        with self.assertRaisesRegex(TypeError, 'unexpected keyword argument'):
+            C = make_dataclass('C',
+                               [],
+                               xxinit=False)
+
     def test_helper_make_dataclass_no_types(self):
         C = make_dataclass('Point', ['x', 'y', 'z'])
         c = C(1, 2, 3)

Misc/NEWS.d/next/Library/2018-01-06-16-50-11.bpo-32279.1xOpU8.rst

@@ -0,0 +1,2 @@
+Add params to dataclasses.make_dataclasses(): init, repr, eq, order, hash,
+and frozen.  Pass them through to dataclass().