cmath.log optional base argument, fixes #823209

[gaul]

BPO	826074
Nosy	@tim-one, @rhettinger, @gaul
Files	cmath_log.diff: cmath.log optional base argument

^{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/rhettinger'
closed_at = <Date 2004-06-14.07:42:25.000>
created_at = <Date 2003-10-18.18:42:21.000>
labels = ['extension-modules']
title = 'cmath.log optional base argument, fixes python/cpython#39404'
updated_at = <Date 2004-06-14.07:42:25.000>
user = 'https://github.com/gaul'

bugs.python.org fields:

activity = <Date 2004-06-14.07:42:25.000>
actor = 'rhettinger'
assignee = 'rhettinger'
closed = True
closed_date = None
closer = None
components = ['Extension Modules']
creation = <Date 2003-10-18.18:42:21.000>
creator = 'gaul'
dependencies = []
files = ['5649']
hgrepos = []
issue_num = 826074
keywords = ['patch']
message_count = 4.0
messages = ['44806', '44807', '44808', '44809']
nosy_count = 3.0
nosy_names = ['tim.peters', 'rhettinger', 'gaul']
pr_nums = []
priority = 'normal'
resolution = 'accepted'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue826074'
versions = ['Python 2.4']

[gaul]

Fixes bug bpo-823209. math.log allows an optional base
argument, add the same functionality to cmath.log.

[rhettinger]

Logged In: YES
user_id=80475

Tim, should this be done?

[tim-one]

Logged In: YES
user_id=31435

I don't really care. I see the referenced bug report had a
marginal use case; OTOH, I can't afford the time to analyze
this for numeric quality and robustness (but almost all of
cmathmodule is in the same boat wrt that, so that's not much
of an argument against it). The patch needs new tests and
doc changes, of course.

[rhettinger]

Logged In: YES
user_id=80475

Modified argument passing to use PyArg_ParseTuple().
Applied as Modules/cmathmodule.c 2.33