[issue9705] limit dict.update() to a given list of keys

[Ultrasick]

New submission from Ultrasick <python at ontheserver.de>:

my_dict_1 = {'a' : 1, 'b' : 1}
my_dict_2 = {'a' : 2, 'b' : 2, 'c' : 2}

my_dict_1.update(my_dict_2, ['a', 'c'])

should result for my_dict_1:

{'a' : 2, 'b' : 1, 'c' : 2}

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components: Interpreter Core
messages: 115157
nosy: Ultrasick
priority: normal
severity: normal
status: open
title: limit dict.update() to a given list of keys
type: feature request
versions: Python 2.6, Python 2.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9705>
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