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bpo-29882: Add an efficient popcount method for integers #771

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Merged
mdickinson merged 13 commits into from
May 29, 2020
Merged

bpo-29882: Add an efficient popcount method for integers #771

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74e3ea6
bpo-29882: Add an efficient popcount method for integers
niklasf Mar 10, 2017
16cc8e5
Merge remote-tracking branch 'upstream/master' into bpo-29882-popcount
mdickinson May 26, 2020
19da190
Update 'sign bit' and versionadded in docs
mdickinson May 26, 2020
070ac45
Add entry to whatsnew document
mdickinson May 26, 2020
b87f162
Doc: use positive example, mention population count
mdickinson May 27, 2020
48084e7
Minor cleanups of the core code
mdickinson May 27, 2020
4c6819a
Fix conflicts with master
mdickinson May 27, 2020
729737c
Move popcount_digit closer to where it's used
mdickinson May 27, 2020
79f4d16
Use z instead of self after conversion
mdickinson May 27, 2020
e3228cf
Add 'absolute value' and 'population count' to docstring
mdickinson May 27, 2020
a0fed82
Fix clinic error about missing summary line
mdickinson May 27, 2020
46d8bc9
Merge remote-tracking branch 'upstream/master' into bpo-29882-popcount
mdickinson May 29, 2020
3e8422b
Ensure popcount_digit is portable with 64-bit ints
mdickinson May 29, 2020
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Doc: use positive example, mention population count
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@mdickinson
mdickinson committed May 27, 2020
commit b87f1621aea6152743be0aff4fb68bcb707b7932
9 changes: 6 additions & 3 deletions Doc/library/stdtypes.rst
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Expand Up @@ -481,13 +481,16 @@ class`. In addition, it provides a few more methods:
.. method:: int.bit_count()

Return the number of ones in the binary representation of the absolute
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value of the integer::
value of the integer. This is also known as the population count.
Example::

>>> n = -19
>>> n = 19
>>> bin(n)
'-0b10011'
'0b10011'
>>> n.bit_count()
3
>>> (-n).bit_count()
3

Equivalent to::

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