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float('infinity') should be valid #47438

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mdickinson opened this issue Jun 24, 2008 · 2 comments
Closed

float('infinity') should be valid #47438

mdickinson opened this issue Jun 24, 2008 · 2 comments
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type-bug An unexpected behavior, bug, or error

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BPO 3188
Nosy @mdickinson, @tiran
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  • infinity.patch
    		•

    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 = 'https://github.com/mdickinson'
closed_at = <Date 2008-07-05.15:23:15.932>
created_at = <Date 2008-06-24.10:47:34.248>
labels = ['type-bug']
title = "float('infinity') should be valid"
updated_at = <Date 2008-07-05.15:23:15.910>
user = 'https://github.com/mdickinson'

    bugs.python.org fields:

    activity = <Date 2008-07-05.15:23:15.910>
actor = 'mark.dickinson'
assignee = 'mark.dickinson'
closed = True
closed_date = <Date 2008-07-05.15:23:15.932>
closer = 'mark.dickinson'
components = []
creation = <Date 2008-06-24.10:47:34.248>
creator = 'mark.dickinson'
dependencies = []
files = ['10716']
hgrepos = []
issue_num = 3188
keywords = ['patch']
message_count = 2.0
messages = ['68675', '69281']
nosy_count = 2.0
nosy_names = ['mark.dickinson', 'christian.heimes']
pr_nums = []
priority = 'normal'
resolution = 'accepted'
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue3188'
versions = ['Python 2.6', 'Python 3.0', 'Python 2.7']
    @mdickinson
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    2.6 adds float('inf') and float('nan') as cross-platform ways to
    generate infinities and NaNs. The C99 standard (section 7.20.1.3,
    paragraph 3) specifies that 'infinity' (in any case, with optional
    preceding sign) should also be a valid input to strtod, and I propose
    that in Python float('infinity') should correspondingly be valid.

    Note that the IEEE 754 standard also states that 'inf' and 'infinity'
    should be valid input string representations of infinity, and Python's
    decimal module also allows both 'inf' and 'infinity'.

    A patch is attached.

    Unless I'm mistaken, this change is simple and unlikely to be
    controversial. I plan to check it in in a week or two if there's no
    feedback before then.

    @mdickinson mdickinson self-assigned this Jun 24, 2008
    @mdickinson mdickinson added the type-bug An unexpected behavior, bug, or error label Jun 24, 2008
    @mdickinson
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    Checked in, r64729.

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