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gh-93250: [Enum] Change IntEnum boundary to KEEP for backwards compatibility (GH-93302)

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In previous versions of Python if an IntEnum member was combined with another integer type value using a bit-wise operation, the resulting value would still be the IntEnum type.  This change restores that behavior.
This commit is contained in:
Ethan Furman 2022-05-27 15:14:28 -07:00 • committed by GitHub
parent 711eda7dec
commit 70cfe56caf
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2 changed files with 11 additions and 3 deletions
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2
Lib/enum.py
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@ -1572,7 +1572,7 @@ def __invert__(self):
__rxor__ = __xor__
class IntFlag(int, ReprEnum, Flag, boundary=EJECT):
class IntFlag(int, ReprEnum, Flag, boundary=KEEP):
"""
Support for integer-based Flags
"""

12
Lib/test/test_enum.py
View file

@ -3353,7 +3353,10 @@ def test_invert(self):
self.assertIs((Open.WO|Open.CE) & ~Open.WO, Open.CE)
def test_boundary(self):
self.assertIs(enum.IntFlag._boundary_, EJECT)
self.assertIs(enum.IntFlag._boundary_, KEEP)
class Simple(IntFlag, boundary=KEEP):
SINGLE = 1
#
class Iron(IntFlag, boundary=STRICT):
ONE = 1
TWO = 2
@ -3372,7 +3375,6 @@ class Space(IntFlag, boundary=EJECT):
EIGHT = 8
self.assertIs(Space._boundary_, EJECT)
#
#
class Bizarre(IntFlag, boundary=KEEP):
b = 3
c = 4
@ -3389,6 +3391,12 @@ class Bizarre(IntFlag, boundary=KEEP):
self.assertEqual(list(Bizarre), [Bizarre.c])
self.assertIs(Bizarre(3), Bizarre.b)
self.assertIs(Bizarre(6), Bizarre.d)
#
simple = Simple.SINGLE | Iron.TWO
self.assertEqual(simple, 3)
self.assertIsInstance(simple, Simple)
self.assertEqual(repr(simple), '<Simple.SINGLE|<Iron.TWO: 2>: 3>')
self.assertEqual(str(simple), '3')
def test_iter(self):
Color = self.Color