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Issue #22117: time.monotonic() now uses the new _PyTime_t API

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* Add _PyTime_FromNanoseconds()
* Add _PyTime_AsSecondsDouble()
* Add unit tests for _PyTime_AsSecondsDouble()
This commit is contained in:
Victor Stinner 2015-03-27 22:27:24 +01:00
parent 52d1493c0c
commit 4bfb460d88
5 changed files with 121 additions and 15 deletions
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64
Lib/test/test_time.py
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@ -16,6 +16,7 @@ SIZEOF_INT = sysconfig.get_config_var('SIZEOF_INT') or 4
TIME_MAXYEAR = (1 << 8 * SIZEOF_INT - 1) - 1
TIME_MINYEAR = -TIME_MAXYEAR - 1
SEC_TO_NS = 10 ** 9
class _PyTime(enum.IntEnum):
# Round towards zero
@ -770,9 +771,7 @@ class TestPytime(unittest.TestCase):
@support.cpython_only
class TestPyTime_t(unittest.TestCase):
def test_FromSecondsObject(self):
from _testcapi import pytime_fromsecondsobject
SEC_TO_NS = 10 ** 9
MAX_SEC = 2 ** 63 // 10 ** 9
from _testcapi import PyTime_FromSecondsObject
# Conversion giving the same result for all rounding methods
for rnd in ALL_ROUNDING_METHODS:
@ -811,21 +810,21 @@ class TestPyTime_t(unittest.TestCase):
(2**25 , 33554432000000000),
(2**25 + 1e-9, 33554432000000000),
# close to 2^63 nanoseconds
# close to 2^63 nanoseconds (_PyTime_t limit)
(9223372036, 9223372036 * SEC_TO_NS),
(9223372036.0, 9223372036 * SEC_TO_NS),
(-9223372036, -9223372036 * SEC_TO_NS),
(-9223372036.0, -9223372036 * SEC_TO_NS),
):
with self.subTest(obj=obj, round=rnd, timestamp=ts):
self.assertEqual(pytime_fromsecondsobject(obj, rnd), ts)
self.assertEqual(PyTime_FromSecondsObject(obj, rnd), ts)
with self.subTest(round=rnd):
with self.assertRaises(OverflowError):
pytime_fromsecondsobject(9223372037, rnd)
pytime_fromsecondsobject(9223372037.0, rnd)
pytime_fromsecondsobject(-9223372037, rnd)
pytime_fromsecondsobject(-9223372037.0, rnd)
PyTime_FromSecondsObject(9223372037, rnd)
PyTime_FromSecondsObject(9223372037.0, rnd)
PyTime_FromSecondsObject(-9223372037, rnd)
PyTime_FromSecondsObject(-9223372037.0, rnd)
# Conversion giving different results depending on the rounding method
UP = _PyTime.ROUND_UP
@ -850,7 +849,52 @@ class TestPyTime_t(unittest.TestCase):
(-0.9999999999, -1000000000, UP),
):
with self.subTest(obj=obj, round=rnd, timestamp=ts):
self.assertEqual(pytime_fromsecondsobject(obj, rnd), ts)
self.assertEqual(PyTime_FromSecondsObject(obj, rnd), ts)
def test_AsSecondsDouble(self):
from _testcapi import PyTime_AsSecondsDouble
for nanoseconds, seconds in (
# near 1 nanosecond
( 0, 0.0),
( 1, 1e-9),
(-1, -1e-9),
# near 1 second
(SEC_TO_NS + 1, 1.0 + 1e-9),
(SEC_TO_NS, 1.0),
(SEC_TO_NS - 1, 1.0 - 1e-9),
# a few seconds
(123 * SEC_TO_NS, 123.0),
(-567 * SEC_TO_NS, -567.0),
# nanosecond are kept for value <= 2^23 seconds
(4194303999999999, 2**22 - 1e-9),
(4194304000000000, 2**22),
(4194304000000001, 2**22 + 1e-9),
# start loosing precision for value > 2^23 seconds
(8388608000000002, 2**23 + 1e-9),
# nanoseconds are lost for value > 2^23 seconds
(16777215999999998, 2**24 - 1e-9),
(16777215999999999, 2**24 - 1e-9),
(16777216000000000, 2**24 ),
(16777216000000001, 2**24 ),
(16777216000000002, 2**24 + 2e-9),
(33554432000000000, 2**25 ),
(33554432000000002, 2**25 ),
(33554432000000004, 2**25 + 4e-9),
# close to 2^63 nanoseconds (_PyTime_t limit)
(9223372036 * SEC_TO_NS, 9223372036.0),
(-9223372036 * SEC_TO_NS, -9223372036.0),
):
with self.subTest(nanoseconds=nanoseconds, seconds=seconds):
self.assertEqual(PyTime_AsSecondsDouble(nanoseconds),
seconds)
if __name__ == "__main__":