[issue12760] Add create mode to open()

[David Townshend]

New submission from David Townshend <aquavitae69 at gmail.com>:

Currently, opening a file with open(file, 'w') overwrites existing files.  It would be useful for open() to raise an error when the file exists.  This proposal is to add a 'c' mode to open, which has the effect to creating a file and opening it for writing, but raising an IOError if it already exists (i.e. the same as os.open(file, os.O_EXCL|os.O_CREAT).

The attached patch implements this, including tests and documentation.

----------
assignee: docs at python
components: Documentation, IO, Library (Lib), Tests
files: open_create.patch
keywords: patch
messages: 142193
nosy: David.Townshend, docs at python
priority: normal
severity: normal
status: open
title: Add create mode to open()
type: feature request
versions: Python 3.3
Added file: http://bugs.python.org/file22910/open_create.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue12760>
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