Mistake in FAQ about converting number to string.

[grottrumsel]

BPO	35126
Nosy	@matrixise, @Mariatta, @csabella, @pablogsal, @miss-islington, @tirkarthi
PRs	[2.7] bpo-35126: Fix a mistake in FAQ about converting number to string #11911

^{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 2019-02-19.14:47:59.306>
created_at = <Date 2018-10-31.17:07:39.040>
labels = ['easy', 'docs']
title = 'Mistake in FAQ about converting number to string.'
updated_at = <Date 2019-02-19.14:47:59.305>
user = 'https://bugs.python.org/grottrumsel'

bugs.python.org fields:

activity = <Date 2019-02-19.14:47:59.305>
actor = 'cheryl.sabella'
assignee = 'docs@python'
closed = True
closed_date = <Date 2019-02-19.14:47:59.306>
closer = 'cheryl.sabella'
components = ['Documentation']
creation = <Date 2018-10-31.17:07:39.040>
creator = 'grottrumsel'
dependencies = []
files = []
hgrepos = []
issue_num = 35126
keywords = ['patch', 'easy']
message_count = 6.0
messages = ['329000', '329015', '335798', '335800', '335802', '335910']
nosy_count = 8.0
nosy_names = ['docs@python', 'matrixise', 'Mariatta', 'cheryl.sabella', 'pablogsal', 'miss-islington', 'xtreak', 'grottrumsel']
pr_nums = ['11911']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue35126'
versions = ['Python 2.7']

[grottrumsel]

In this question:
https://docs.python.org/2.7/faq/programming.html#how-do-i-convert-a-number-to-a-string

There is a statement:
"{:.3f}".format(1/3) yields '0.333'

While

In [2]: "{:.3f}".format(1/3)
Out[2]: '0.000'

In [3]: "{:.3f}".format(1/3.0)
Out[3]: '0.333'

[pablogsal]

Yep, this is incorrect in Python 2 unless from __future__ import division is imported at the beginning. Would you want to make a PR against the 2.7 branch to correct this?

[tirkarthi]

This is a good first issue. Python 3 docs uses {:.3f}".format(1.0/3.0) that was changed as part of 04d8a24. Python 2 docs could be changed too to use floats that makes the example correct.

[matrixise]

I am working on this issue.

[matrixise]

Hi @XTreak,

I have just submitted a PR but where I explain the change with Python2/3 and the division operator.

Have a nice day,

[miss-islington]

New changeset c611db4 by Miss Islington (bot) (Stéphane Wirtel) in branch '2.7':
[2.7] bpo-35126: Fix a mistake in FAQ about converting number to string (GH-11911)
c611db4