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grasp81 mannequin opened this issue Mar 19, 2004 · 2 comments
Closed

Math Division Problem? #40052

grasp81 mannequin opened this issue Mar 19, 2004 · 2 comments
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interpreter-core (Objects, Python, Grammar, and Parser dirs)

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@grasp81
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grasp81 mannequin commented Mar 19, 2004

BPO 919498
Nosy @sjoerdmullender

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 2004-03-19.14:23:05.000>
created_at = <Date 2004-03-19.13:20:25.000>
labels = ['interpreter-core', 'invalid']
title = 'Math Division Problem?'
updated_at = <Date 2004-03-19.14:23:05.000>
user = 'https://bugs.python.org/grasp81'

bugs.python.org fields:

activity = <Date 2004-03-19.14:23:05.000>
actor = 'sjoerd'
assignee = 'none'
closed = True
closed_date = None
closer = None
components = ['Interpreter Core']
creation = <Date 2004-03-19.13:20:25.000>
creator = 'grasp81'
dependencies = []
files = []
hgrepos = []
issue_num = 919498
keywords = []
message_count = 2.0
messages = ['20270', '20271']
nosy_count = 2.0
nosy_names = ['sjoerd', 'grasp81']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue919498'
versions = ['Python 2.3']
@grasp81
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grasp81 mannequin commented Mar 19, 2004

Using
Python 2.3.3 (#51, Dec 18 2003, 20:22:39) [MSC
v.1200 32 bit (Intel)] on win32

A mere real division resulted in this:
>>> 7.0/3
2.3333333333333335

Mind the trailing '5'. Did I miss my University classes too
much? ;)

Amazingly,
>>> 4.0/3
1.3333333333333333
- works OK.

@grasp81 grasp81 mannequin closed this as completed Mar 19, 2004
@grasp81 grasp81 mannequin added invalid interpreter-core (Objects, Python, Grammar, and Parser dirs) labels Mar 19, 2004
@grasp81 grasp81 mannequin closed this as completed Mar 19, 2004
@grasp81 grasp81 mannequin added invalid interpreter-core (Objects, Python, Grammar, and Parser dirs) labels Mar 19, 2004
@sjoerdmullender
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Logged In: YES
user_id=43607

This is not a bug.

Binary floating point cannot represent decimal fractions exactly,
so some rounding always occurs (even in Python 1.5.2).

What changed is that Python 2.0 shows more precision than before
in certain circumstances (repr() and the interactive prompt).

You can use str() or print to get the old, rounded output:

>>> print 0.1+0.1
0.2
>>>

Follow the link for more information:

http://www.python.org/doc/2.2.1/tut/node14.html

@ezio-melotti ezio-melotti transferred this issue from another repository Apr 9, 2022
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