8000 gh-119714: Add PyLong_GetNumBits() function by vstinner · Pull Request #119715 · python/cpython · GitHub
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gh-119714: Add PyLong_GetNumBits() function #119715

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gh-119714: Add PyLong_GetNumBits() function #119715

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0b46817
gh-119714: Add PyLong_GetNumBits() function
vstinner May 29, 2024
9481136
Suggest calling the bit_length() method
vstinner May 31, 2024
c1f6310
Update Doc/c-api/long.rst
vstinner Jun 3, 2024
fd8a3f2
Update Include/cpython/longobject.h
vstinner Jun 3, 2024
afc665e
Add OverflowError test
vstinner Jun 3, 2024
b08d260
doc: add link to int.bit_length() method
vstinner Jun 3, 2024
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Add OverflowError test
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@vstinner
vstinner committed Jun 3, 2024
commit afc665e3b5fc5530c580a7d79d77cb591004d0b1
12 changes: 12 additions & 0 deletions Lib/test/test_capi/test_long.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
import unittest
import sys
import test.support as support
from test.support import bigmemtest

from test.support import import_helper

Expand Down Expand Up @@ -752,6 +753,17 @@ def test_long_getnumbits(self):

# CRASHES numbits(NULL)

# The test is always skipped on 64-bit platforms, it requires way too much
# memory. It's only run on 32-bit platforms.
@bigmemtest(size=(_testcapi.PY_SSIZE_T_MAX // sys.int_info.bits_per_digit
* sys.int_info.sizeof_digit) + sys.getsizeof(123),
memuse=1, dry_run=False)
def test_long_getnumbits_overflow(self, size):
numbits = _testcapi.pylong_getnumbits
big_int = 1 << _testcapi.PY_SSIZE_T_MAX
with self.assertRaises(OverflowError):
numbits(big_int)


if __name__ == "__main__":
unittest.main()
0