Add math.isfinite()

[benjaminp]

BPO	9165
Nosy	@mdickinson, @ericvsmith, @benjaminp
Files	isfinite.patch isfinite_v2.patch

^{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 = 'https://github.com/mdickinson'
closed_at = <Date 2010-07-11.17:39:35.697>
created_at = <Date 2010-07-05.15:16:47.890>
labels = ['extension-modules', 'type-feature']
title = 'Add math.isfinite()'
updated_at = <Date 2010-07-11.17:39:35.696>
user = 'https://github.com/benjaminp'

bugs.python.org fields:

activity = <Date 2010-07-11.17:39:35.696>
actor = 'mark.dickinson'
assignee = 'mark.dickinson'
closed = True
closed_date = <Date 2010-07-11.17:39:35.697>
closer = 'mark.dickinson'
components = ['Extension Modules']
creation = <Date 2010-07-05.15:16:47.890>
creator = 'benjamin.peterson'
dependencies = []
files = ['17867', '17870']
hgrepos = []
issue_num = 9165
keywords = ['patch']
message_count = 6.0
messages = ['109324', '109326', '109328', '109330', '109356', '110030']
nosy_count = 3.0
nosy_names = ['mark.dickinson', 'eric.smith', 'benjamin.peterson']
pr_nums = []
priority = 'low'
resolution = 'accepted'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue9165'
versions = ['Python 3.2']

[benjaminp]

It would be equivalent to "not isinf(x) and not isnan(x)".

[mdickinson]

+1. This is natural counterpart to math.isinf and math.isnan. In fact, it's quite surprising to have those two functions available and not math.isfinite.

Here's a patch.

[mdickinson]

Version 2 of patch adds cmath.isfinite, and changes doc markup to use ``True`` instead of :const:`True` (thanks Benjamin!).

[benjaminp]

Looks good to me.

[ericvsmith]

+1 from me, too.

You might want to reference this issue in the Misc/NEWS entry.

[mdickinson]

Applied in r82818 (with issue number added to Misc/NEWS; thanks, Eric!).