Decimal Multiplication problems: Wrong solution

[ShadowRaven]

BPO	34923
Nosy	@tirkarthi

^{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 2018-10-07.17:06:31.473>
created_at = <Date 2018-10-07.16:53:51.004>
labels = ['3.7', 'invalid']
title = 'Decimal Multiplication problems: Wrong solution'
updated_at = <Date 2018-10-07.17:42:52.788>
user = 'https://bugs.python.org/ShadowRaven'

bugs.python.org fields:

activity = <Date 2018-10-07.17:42:52.788>
actor = 'mark.dickinson'
assignee = 'none'
closed = True
closed_date = <Date 2018-10-07.17:06:31.473>
closer = 'Shadow Raven'
components = []
creation = <Date 2018-10-07.16:53:51.004>
creator = 'Shadow Raven'
dependencies = []
files = []
hgrepos = []
issue_num = 34923
keywords = []
message_count = 3.0
messages = ['327290', '327292', '327293']
nosy_count = 2.0
nosy_names = ['xtreak', 'Shadow Raven']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue34923'
versions = ['Python 3.7']

[ShadowRaven]

Some decimals, when multiplied with others, give wrong solutions:

6.23*5 = 31.150000000000002
6.89*5 = 34.449999999999996

There are more but I can't list all.

[tirkarthi]

Thanks for the report. I think this a known limitation and not a bug. Please read more about floating point limitation at https://docs.python.org/3/tutorial/floatingpoint.html . I would propose closing this. Similar issue reported few days back : bpo-34907

[ShadowRaven]

Oh okay thanks