Wrong dump of floats

[stein]

BPO	5589
Nosy	@ezio-melotti, @bitdancer

^{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 2009-03-28.19:18:22.579>
created_at = <Date 2009-03-28.18:58:35.207>
labels = ['interpreter-core', 'type-bug', 'invalid']
title = 'Wrong dump of floats'
updated_at = <Date 2009-03-28.19:18:22.578>
user = 'https://bugs.python.org/stein'

bugs.python.org fields:

activity = <Date 2009-03-28.19:18:22.578>
actor = 'benjamin.peterson'
assignee = 'none'
closed = True
closed_date = <Date 2009-03-28.19:18:22.579>
closer = 'benjamin.peterson'
components = ['Interpreter Core']
creation = <Date 2009-03-28.18:58:35.207>
creator = 'stein'
dependencies = []
files = []
hgrepos = []
issue_num = 5589
keywords = []
message_count = 3.0
messages = ['84323', '84324', '84327']
nosy_count = 3.0
nosy_names = ['ezio.melotti', 'r.david.murray', 'stein']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue5589'
versions = ['Python 2.6']

[stein]

Hi there,

I just recognized a weird behaviour of the json module...

Dumpig a float like 0.1 I get some crazy output.

Here is an example:

>>> import json
>>> json.dumps([.1])
'[0.10000000000000001]'

Very simple to reproduce;)

• Sebastian

[ezio-melotti]

>>> .1
0.10000000000000001

Read http://docs.python.org/tutorial/floatingpoint.html

[bitdancer]

As Ezio points out, this is correct Python behavior.