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[3.6] bpo-31373: remove overly strict float range checks (GH-3486) (#3495)

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This undoes a853a8ba78 except for the pytime.c
parts. We want to continue to allow IEEE 754 doubles larger than FLT_MAX to be
rounded into finite floats. Tests were added to very this behavior.
(cherry picked from commit 2bb69a5b4e)
This commit is contained in:
Benjamin Peterson 2017-09-11 23:08:49 -07:00 • committed by GitHub
parent 99b941b420
commit cb356c2ecc
4 changed files with 14 additions and 6 deletions
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6
Lib/test/test_float.py
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@ -613,6 +613,12 @@ class IEEEFormatTestCase(unittest.TestCase):
('<f', LE_FLOAT_NAN)]:
struct.unpack(fmt, data)
@support.requires_IEEE_754
def test_serialized_float_rounding(self):
from _testcapi import FLT_MAX
self.assertEqual(struct.pack("<f", 3.40282356e38), struct.pack("<f", FLT_MAX))
self.assertEqual(struct.pack("<f", -3.40282356e38), struct.pack("<f", -FLT_MAX))
class FormatTestCase(unittest.TestCase):
def test_format(self):