Patch #1623563: allow __class__ assignment for classes with __slots__.
The old and the new class are still required to have the same slot
names, but the order in which they are specified is not relevant.
diff --git a/Lib/test/test_descr.py b/Lib/test/test_descr.py
index 71f4ec4..5abecf4 100644
--- a/Lib/test/test_descr.py
+++ b/Lib/test/test_descr.py
@@ -2853,6 +2853,51 @@
cant(o, type(1))
cant(o, type(None))
del o
+ class G(object):
+ __slots__ = ["a", "b"]
+ class H(object):
+ __slots__ = ["b", "a"]
+ try:
+ unicode
+ except NameError:
+ class I(object):
+ __slots__ = ["a", "b"]
+ else:
+ class I(object):
+ __slots__ = [unicode("a"), unicode("b")]
+ class J(object):
+ __slots__ = ["c", "b"]
+ class K(object):
+ __slots__ = ["a", "b", "d"]
+ class L(H):
+ __slots__ = ["e"]
+ class M(I):
+ __slots__ = ["e"]
+ class N(J):
+ __slots__ = ["__weakref__"]
+ class P(J):
+ __slots__ = ["__dict__"]
+ class Q(J):
+ pass
+ class R(J):
+ __slots__ = ["__dict__", "__weakref__"]
+
+ for cls, cls2 in ((G, H), (G, I), (I, H), (Q, R), (R, Q)):
+ x = cls()
+ x.a = 1
+ x.__class__ = cls2
+ verify(x.__class__ is cls2,
+ "assigning %r as __class__ for %r silently failed" % (cls2, x))
+ vereq(x.a, 1)
+ x.__class__ = cls
+ verify(x.__class__ is cls,
+ "assigning %r as __class__ for %r silently failed" % (cls, x))
+ vereq(x.a, 1)
+ for cls in G, J, K, L, M, N, P, R, list, Int:
+ for cls2 in G, J, K, L, M, N, P, R, list, Int:
+ if cls is cls2:
+ continue
+ cant(cls(), cls2)
def setdict():
if verbose: print "Testing __dict__ assignment..."