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Problems with float and "6" type #46038

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pedrocpneto mannequin opened this issue Dec 25, 2007 · 2 comments
Closed

Problems with float and "6" type #46038

pedrocpneto mannequin opened this issue Dec 25, 2007 · 2 comments
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interpreter-core (Objects, Python, Grammar, and Parser dirs) performance Performance or resource usage

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@pedrocpneto
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Mannequin

pedrocpneto mannequin commented Dec 25, 2007

BPO 1697
Nosy @tiran

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 2007-12-25.16:41:12.302>
created_at = <Date 2007-12-25.13:15:01.625>
labels = ['interpreter-core', 'invalid', 'performance']
title = 'Problems with float and "6" type'
updated_at = <Date 2007-12-25.16:41:12.292>
user = 'https://bugs.python.org/pedrocpneto'

bugs.python.org fields:

activity = <Date 2007-12-25.16:41:12.292>
actor = 'christian.heimes'
assignee = 'none'
closed = True
closed_date = <Date 2007-12-25.16:41:12.302>
closer = 'christian.heimes'
components = ['Interpreter Core']
creation = <Date 2007-12-25.13:15:01.625>
creator = 'pedrocpneto'
dependencies = []
files = []
hgrepos = []
issue_num = 1697
keywords = []
message_count = 2.0
messages = ['58989', '58992']
nosy_count = 2.0
nosy_names = ['christian.heimes', 'pedrocpneto']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = None
status = 'closed'
superseder = None
type = 'resource usage'
url = 'https://bugs.python.org/issue1697'
versions = ['Python 2.5']
@pedrocpneto
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pedrocpneto mannequin commented Dec 25, 2007

Problems with float and "6" type

Hi, I am having problems both in the Windows version on the Linux
version of Python as put some number with some 6 type that it always
returns a value me, following examples:

>>> 2.0
2.0
>>> 1.55
1.55
>>> 1.56
1.5600000000000001
>>> 1.6
1.6000000000000001
>>> 1.63
1.6299999999999999
>>> 1.64
1.6399999999999999
>>> 1.71
1.71
>>> 6.0
6.0

Recalling that the error happens only with the digit 6 in float.
Thanks for attention.

Pedro Clemente Pereira Neto
Brasil
pedrocpneto at gmail.com

@pedrocpneto pedrocpneto mannequin added interpreter-core (Objects, Python, Grammar, and Parser dirs) performance Performance or resource usage labels Dec 25, 2007
@tiran
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tiran commented Dec 25, 2007

Your results are correct and expected. You can find more information at:

http://effbot.org/pyfaq/why-are-floating-point-calculations-so-inaccurate.htm
http://en.wikipedia.org/wiki/IEEE_754

@tiran tiran closed this as completed Dec 25, 2007
@tiran tiran added the invalid label Dec 25, 2007
@ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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