round function is not working as expected

[vishalatul09]

BPO	47160
Nosy	@tirkarthi
Files	compiled_result.jpg: compiled result

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assignee = None
closed_at = <Date 2022-03-30.11:04:59.302>
created_at = <Date 2022-03-30.10:45:33.440>
labels = ['3.7', 'invalid', 'type-bug', 'library']
title = 'round function is not working as expected'
updated_at = <Date 2022-03-30.11:04:59.300>
user = 'https://bugs.python.org/vishalatul09'

bugs.python.org fields:

activity = <Date 2022-03-30.11:04:59.300>
actor = 'xtreak'
assignee = 'none'
closed = True
closed_date = <Date 2022-03-30.11:04:59.302>
closer = 'xtreak'
components = ['Library (Lib)']
creation = <Date 2022-03-30.10:45:33.440>
creator = 'vishalatul09'
dependencies = []
files = ['50707']
hgrepos = []
issue_num = 47160
keywords = []
message_count = 2.0
messages = ['416333', '416337']
nosy_count = 2.0
nosy_names = ['xtreak', 'vishalatul09']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue47160'
versions = ['Python 3.7']

[vishalatul09]

round function is not working as expected .
my number is x= 0.967565*185000= 178999.525
round(x,2)
answer is coming as 178999.52
expected value is 178999.53

[tirkarthi]

This is documented

https://docs.python.org/3/library/functions.html#round

The behavior of round() for floats can be surprising: for example, round(2.675, 2) gives 2.67 instead of the expected 2.68. This is not a bug: it’s a result of the fact that most decimal fractions can’t be represented exactly as a float. See Floating Point Arithmetic: Issues and Limitations for more information.