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bpo-37685: Fixed comparisons of datetime.timedelta and datetime.timezone. (GH-14996) 

There was a discrepancy between the Python and C implementations.

Add singletons ALWAYS_EQ, LARGEST and SMALLEST in test.support
to test mixed type comparison.
This commit is contained in:
Serhiy Storchaka 2019-08-04 12:38:46 +03:00 committed by GitHub
parent 5c72badd06
commit 17e52649c0
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GPG Key ID: 4AEE18F83AFDEB23
7 changed files with 107 additions and 84 deletions
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17
Doc/library/test.rst
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@ -356,11 +356,28 @@ The :mod:`test.support` module defines the following constants:
Check for presence of docstrings.
.. data:: TEST_HTTP_URL
Define the URL of a dedicated HTTP server for the network tests.
.. data:: ALWAYS_EQ
Object that is equal to anything. Used to test mixed type comparison.
.. data:: LARGEST
Object that is greater than anything (except itself).
Used to test mixed type comparison.
.. data:: SMALLEST
Object that is less than anything (except itself).
Used to test mixed type comparison.
The :mod:`test.support` module defines the following functions:

22
Lib/datetime.py
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@ -739,25 +739,25 @@ class timedelta:
if isinstance(other, timedelta):
return self._cmp(other) <= 0
else:
_cmperror(self, other)
return NotImplemented
def __lt__(self, other):
if isinstance(other, timedelta):
return self._cmp(other) < 0
else:
_cmperror(self, other)
return NotImplemented
def __ge__(self, other):
if isinstance(other, timedelta):
return self._cmp(other) >= 0
else:
_cmperror(self, other)
return NotImplemented
def __gt__(self, other):
if isinstance(other, timedelta):
return self._cmp(other) > 0
else:
_cmperror(self, other)
return NotImplemented
def _cmp(self, other):
assert isinstance(other, timedelta)
@ -1316,25 +1316,25 @@ class time:
if isinstance(other, time):
return self._cmp(other) <= 0
else:
_cmperror(self, other)
return NotImplemented
def __lt__(self, other):
if isinstance(other, time):
return self._cmp(other) < 0
else:
_cmperror(self, other)
return NotImplemented
def __ge__(self, other):
if isinstance(other, time):
return self._cmp(other) >= 0
else:
_cmperror(self, other)
return NotImplemented
def __gt__(self, other):
if isinstance(other, time):
return self._cmp(other) > 0
else:
_cmperror(self, other)
return NotImplemented
def _cmp(self, other, allow_mixed=False):
assert isinstance(other, time)
@ -2210,9 +2210,9 @@ class timezone(tzinfo):
return (self._offset, self._name)
def __eq__(self, other):
if type(other) != timezone:
return False
return self._offset == other._offset
if isinstance(other, timezone):
return self._offset == other._offset
return NotImplemented
def __hash__(self):
return hash(self._offset)

74
Lib/test/datetimetester.py
View File

@ -2,11 +2,8 @@
See http://www.zope.org/Members/fdrake/DateTimeWiki/TestCases
"""
from test.support import is_resource_enabled
import itertools
import bisect
import copy
import decimal
import sys
@ -22,6 +19,7 @@ from array import array
from operator import lt, le, gt, ge, eq, ne, truediv, floordiv, mod
from test import support
from test.support import is_resource_enabled, ALWAYS_EQ, LARGEST, SMALLEST
import datetime as datetime_module
from datetime import MINYEAR, MAXYEAR
@ -54,18 +52,6 @@ INF = float("inf")
NAN = float("nan")
class ComparesEqualClass(object):
"""
A class that is always equal to whatever you compare it to.
"""
def __eq__(self, other):
return True
def __ne__(self, other):
return False
#############################################################################
# module tests
@ -353,6 +339,18 @@ class TestTimeZone(unittest.TestCase):
self.assertTrue(timezone(ZERO) != None)
self.assertFalse(timezone(ZERO) == None)
tz = timezone(ZERO)
self.assertTrue(tz == ALWAYS_EQ)
self.assertFalse(tz != ALWAYS_EQ)
self.assertTrue(tz < LARGEST)
self.assertFalse(tz > LARGEST)
self.assertTrue(tz <= LARGEST)
self.assertFalse(tz >= LARGEST)
self.assertFalse(tz < SMALLEST)
self.assertTrue(tz > SMALLEST)
self.assertFalse(tz <= SMALLEST)
self.assertTrue(tz >= SMALLEST)
def test_aware_datetime(self):
# test that timezone instances can be used by datetime
t = datetime(1, 1, 1)
@ -414,10 +412,21 @@ class HarmlessMixedComparison:
# Comparison to objects of unsupported types should return
# NotImplemented which falls back to the right hand side's __eq__
# method. In this case, ComparesEqualClass.__eq__ always returns True.
# ComparesEqualClass.__ne__ always returns False.
self.assertTrue(me == ComparesEqualClass())
self.assertFalse(me != ComparesEqualClass())
# method. In this case, ALWAYS_EQ.__eq__ always returns True.
# ALWAYS_EQ.__ne__ always returns False.
self.assertTrue(me == ALWAYS_EQ)
self.assertFalse(me != ALWAYS_EQ)
# If the other class explicitly defines ordering
# relative to our class, it is allowed to do so
self.assertTrue(me < LARGEST)
self.assertFalse(me > LARGEST)
self.assertTrue(me <= LARGEST)
self.assertFalse(me >= LARGEST)
self.assertFalse(me < SMALLEST)
self.assertTrue(me > SMALLEST)
self.assertFalse(me <= SMALLEST)
self.assertTrue(me >= SMALLEST)
def test_harmful_mixed_comparison(self):
me = self.theclass(1, 1, 1)
@ -1582,29 +1591,6 @@ class TestDate(HarmlessMixedComparison, unittest.TestCase):
self.assertRaises(TypeError, lambda: our < their)
self.assertRaises(TypeError, lambda: their < our)
# However, if the other class explicitly defines ordering
# relative to our class, it is allowed to do so
class LargerThanAnything:
def __lt__(self, other):
return False
def __le__(self, other):
return isinstance(other, LargerThanAnything)
def __eq__(self, other):
return isinstance(other, LargerThanAnything)
def __gt__(self, other):
return not isinstance(other, LargerThanAnything)
def __ge__(self, other):
return True
their = LargerThanAnything()
self.assertEqual(our == their, False)
self.assertEqual(their == our, False)
self.assertEqual(our != their, True)
self.assertEqual(their != our, True)
self.assertEqual(our < their, True)
self.assertEqual(their < our, False)
def test_bool(self):
# All dates are considered true.
self.assertTrue(self.theclass.min)
@ -3781,8 +3767,8 @@ class TestTimeTZ(TestTime, TZInfoBase, unittest.TestCase):
self.assertRaises(ValueError, base.replace, microsecond=1000000)
def test_mixed_compare(self):
t1 = time(1, 2, 3)
t2 = time(1, 2, 3)
t1 = self.theclass(1, 2, 3)
t2 = self.theclass(1, 2, 3)
self.assertEqual(t1, t2)
t2 = t2.replace(tzinfo=None)
self.assertEqual(t1, t2)

36
Lib/test/support/__init__.py
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@ -113,6 +113,7 @@ __all__ = [
"run_with_locale", "swap_item",
"swap_attr", "Matcher", "set_memlimit", "SuppressCrashReport", "sortdict",
"run_with_tz", "PGO", "missing_compiler_executable", "fd_count",
"ALWAYS_EQ", "LARGEST", "SMALLEST"
]
class Error(Exception):
@ -3103,6 +3104,41 @@ class FakePath:
return self.path
class _ALWAYS_EQ:
"""
Object that is equal to anything.
"""
def __eq__(self, other):
return True
def __ne__(self, other):
return False
ALWAYS_EQ = _ALWAYS_EQ()
@functools.total_ordering
class _LARGEST:
"""
Object that is greater than anything (except itself).
"""
def __eq__(self, other):
return isinstance(other, _LARGEST)
def __lt__(self, other):
return False
LARGEST = _LARGEST()
@functools.total_ordering
class _SMALLEST:
"""
Object that is less than anything (except itself).
"""
def __eq__(self, other):
return isinstance(other, _SMALLEST)
def __gt__(self, other):
return False
SMALLEST = _SMALLEST()
def maybe_get_event_loop_policy():
"""Return the global event loop policy if one is set, else return None."""
return asyncio.events._event_loop_policy

33
Lib/test/test_ipaddress.py
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@ -12,6 +12,7 @@ import operator
import pickle
import ipaddress
import weakref
from test.support import LARGEST, SMALLEST
class BaseTestCase(unittest.TestCase):
@ -673,20 +674,6 @@ class FactoryFunctionErrors(BaseTestCase):
self.assertFactoryError(ipaddress.ip_network, "network")
@functools.total_ordering
class LargestObject:
def __eq__(self, other):
return isinstance(other, LargestObject)
def __lt__(self, other):
return False
@functools.total_ordering
class SmallestObject:
def __eq__(self, other):
return isinstance(other, SmallestObject)
def __gt__(self, other):
return False
class ComparisonTests(unittest.TestCase):
v4addr = ipaddress.IPv4Address(1)
@ -775,8 +762,6 @@ class ComparisonTests(unittest.TestCase):
def test_foreign_type_ordering(self):
other = object()
smallest = SmallestObject()
largest = LargestObject()
for obj in self.objects:
with self.assertRaises(TypeError):
obj < other
@ -786,14 +771,14 @@ class ComparisonTests(unittest.TestCase):
obj <= other
with self.assertRaises(TypeError):
obj >= other
self.assertTrue(obj < largest)
self.assertFalse(obj > largest)
self.assertTrue(obj <= largest)
self.assertFalse(obj >= largest)
self.assertFalse(obj < smallest)
self.assertTrue(obj > smallest)
self.assertFalse(obj <= smallest)
self.assertTrue(obj >= smallest)
self.assertTrue(obj < LARGEST)
self.assertFalse(obj > LARGEST)
self.assertTrue(obj <= LARGEST)
self.assertFalse(obj >= LARGEST)
self.assertFalse(obj < SMALLEST)
self.assertTrue(obj > SMALLEST)
self.assertFalse(obj <= SMALLEST)
self.assertTrue(obj >= SMALLEST)
def test_mixed_type_key(self):
# with get_mixed_type_key, you can sort addresses and network.

2
Misc/NEWS.d/next/Library/2019-07-28-22-25-25.bpo-37685._3bN9f.rst Normal file
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@ -0,0 +1,2 @@
Fixed comparisons of :class:`datetime.timedelta` and
:class:`datetime.timezone`.

7
Modules/_datetimemodule.c
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@ -3741,11 +3741,8 @@ timezone_richcompare(PyDateTime_TimeZone *self,
{
if (op != Py_EQ && op != Py_NE)
Py_RETURN_NOTIMPLEMENTED;
if (Py_TYPE(other) != &PyDateTime_TimeZoneType) {
if (op == Py_EQ)
Py_RETURN_FALSE;
else
Py_RETURN_TRUE;
if (!PyTZInfo_Check(other)) {
Py_RETURN_NOTIMPLEMENTED;
}
return delta_richcompare(self->offset, other->offset, op);
}