Documentation for PyDict_Update is incorrect

[ncoghlan]

BPO	18456
Nosy	@rhettinger, @ncoghlan, @ezio-melotti
Files	PyDict_Update.patch: Updated PyDict_Update doc

^{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 2014-03-25.08:35:13.268>
created_at = <Date 2013-07-15.02:11:12.491>
labels = ['type-feature', 'docs']
title = 'Documentation for PyDict_Update is incorrect'
updated_at = <Date 2014-03-25.08:35:35.850>
user = 'https://github.com/ncoghlan'

bugs.python.org fields:

activity = <Date 2014-03-25.08:35:35.850>
actor = 'python-dev'
assignee = 'docs@python'
closed = True
closed_date = <Date 2014-03-25.08:35:13.268>
closer = 'python-dev'
components = ['Documentation']
creation = <Date 2013-07-15.02:11:12.491>
creator = 'ncoghlan'
dependencies = []
files = ['34610']
hgrepos = []
issue_num = 18456
keywords = ['patch']
message_count = 4.0
messages = ['193070', '213116', '214788', '214789']
nosy_count = 6.0
nosy_names = ['rhettinger', 'ncoghlan', 'ezio.melotti', 'docs@python', 'python-dev', 'Jill.M']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue18456'
versions = ['Python 2.7', 'Python 3.3', 'Python 3.4']

[ncoghlan]

The docs from PyDict_Update (http://docs.python.org/3/c-api/dict.html#PyDict_Update) claim it is equivalent to the Python level dict.update (http://docs.python.org/3/library/stdtypes#dict.update)

This isn't accurate - unlike dict.update, PyDict_Update doesn't fall back to the iterating over a sequence of key value pairs if the second argument has no "keys" attribute.

[rhettinger]

Nice catch.

[python-dev]

New changeset 8e1637e3a099 by Georg Brandl in branch '3.4':
Closes bpo-18456: Doc fix: PyDict_Update only works with dict-like objects, not key-value sequences. Patch by priyapappachan.
http://hg.python.org/cpython/rev/8e1637e3a099

[python-dev]

New changeset 2e51845a99e2 by Georg Brandl in branch '2.7':
Closes bpo-18456: Doc fix: PyDict_Update only works with dict-like objects, not key-value sequences. Patch by priyapappachan.
http://hg.python.org/cpython/rev/2e51845a99e2