proxy_bypass_macosx_sysconf does not handle singel ip addresses correctly

[SergeDroz]

BPO	14329
Nosy	@ronaldoussoren
Files	urllib_macos.diff

^{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/ronaldoussoren'
closed_at = <Date 2012-10-15.07:52:48.837>
created_at = <Date 2012-03-15.22:49:13.759>
labels = ['OS-mac', 'type-bug']
title = 'proxy_bypass_macosx_sysconf does not handle singel ip addresses correctly'
updated_at = <Date 2012-10-15.07:52:48.836>
user = 'https://bugs.python.org/SergeDroz'

bugs.python.org fields:

activity = <Date 2012-10-15.07:52:48.836>
actor = 'ronaldoussoren'
assignee = 'ronaldoussoren'
closed = True
closed_date = <Date 2012-10-15.07:52:48.837>
closer = 'ronaldoussoren'
components = ['macOS']
creation = <Date 2012-03-15.22:49:13.759>
creator = 'Serge.Droz'
dependencies = []
files = ['24880']
hgrepos = []
issue_num = 14329
keywords = ['patch']
message_count = 2.0
messages = ['155973', '168649']
nosy_count = 2.0
nosy_names = ['ronaldoussoren', 'Serge.Droz']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue14329'
versions = ['Python 2.6']

[SergeDroz]

On MacOS in urllib the function proxy_bypass_macosx_sysconf does not handle proxy settings which are just IP addresses correctly:
If there is any IP address, always true is reported.

Reason: the mask is calculated wrong.
The attached patch fixes this.

NB This is also an issue in other python versions

[ronaldoussoren]

Patch seems to be present in the current maintenance and development releases (2.7, 3.2 and 3.3).

Can you confirm that this issue is no longer present in python 2.7 and later?