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decimal.Decimal greater than/less than sometimes gives wrong answers when comparing to floats. #51572

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adamtj mannequin opened this issue Nov 14, 2009 · 3 comments
Closed

decimal.Decimal greater than/less than sometimes gives wrong answers when comparing to floats. #51572

adamtj mannequin opened this issue Nov 14, 2009 · 3 comments
Labels
stdlib Python modules in the Lib dir type-bug An unexpected behavior, bug, or error

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@adamtj
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adamtj mannequin commented Nov 14, 2009

BPO 7323
Nosy @mdickinson
Superseder
  • bpo-2531: float compared to decimal is silently incorrect.
    		•

    Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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    GitHub fields:

    assignee = None
closed_at = <Date 2009-11-14.22:20:49.225>
created_at = <Date 2009-11-14.18:39:19.397>
labels = ['type-bug', 'library']
title = 'decimal.Decimal greater than/less than sometimes gives wrong answers when comparing to floats.'
updated_at = <Date 2009-11-14.22:39:16.972>
user = 'https://bugs.python.org/adamtj'

    bugs.python.org fields:

    activity = <Date 2009-11-14.22:39:16.972>
actor = 'mark.dickinson'
assignee = 'none'
closed = True
closed_date = <Date 2009-11-14.22:20:49.225>
closer = 'mark.dickinson'
components = ['Library (Lib)']
creation = <Date 2009-11-14.18:39:19.397>
creator = 'adamtj'
dependencies = []
files = []
hgrepos = []
issue_num = 7323
keywords = []
message_count = 3.0
messages = ['95248', '95262', '95264']
nosy_count = 2.0
nosy_names = ['mark.dickinson', 'adamtj']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = None
status = 'closed'
superseder = '2531'
type = 'behavior'
url = 'https://bugs.python.org/issue7323'
versions = ['Python 2.6', 'Python 2.5', 'Python 2.4']
    @adamtj
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    adamtj mannequin commented Nov 14, 2009

    These should all return False, or some of them should raise exceptions:

    Python 2.6.2 (release26-maint, Apr 19 2009, 01:58:18)
[GCC 4.3.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import decimal
>>> decimal.Decimal('0') > 0
False
>>> decimal.Decimal('0') < 0
False
>>> decimal.Decimal('0') > 0.0
True
>>> decimal.Decimal('0') < 0.0
False
>>> 0.0 > decimal.Decimal('0')
False
>>> 0.0 < decimal.Decimal('0')
True
>>> 0.0 < decimal.Decimal('0.0')
True
>>> decimal.Decimal('0') > decimal.Decimal('0')
False

    @adamtj adamtj mannequin added stdlib Python modules in the Lib dir type-bug An unexpected behavior, bug, or error labels Nov 14, 2009
    @mdickinson
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    Unfortunately there's no easy way to fix this in 2.x, where any object is
    supposed to be comparable with any other. See bpo-2531 for a previous
    discussion. It's fixed in 3.x: there a comparison (other than ==, !=)
    between a float and a Decimal does raise an exception.

    Closing as a duplicate of bpo-2531. bpo-2531 is also closed, but you
    should feel free to add to the discussion there.

    @mdickinson
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    I've re-opened bpo-2531: some recent changes (in particular, the
    backport of the 3.x float <-> string conversions to 2.x) may make
    previously rejected solutions viable again.

    @ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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