[issue4121] open(): use keyword only for arguments other than file and mode
report at bugs.python.org
Tue Oct 14 13:02:02 CEST 2008
New submission from STINNER Victor <victor.stinner at haypocalc.com>:
In the C library, fopen() have two arguments: filename and the mode,
and open() has three arguments: filename, mode and flags. In Python,
open() has 7 arguments:
Most programs only use the two first arguments, but buffering is
sometimes set. Eg. open(filename, "r") or open(filename, "wb", 0).
I think that only the file and mode arguments are easy to understand,
the others have to be specified using their name. Eg.
open(filename, "wb", buffering=0) or open(filename, "r",
I wrote a patch to use keyword only arguments, and another to fix some
libraries and the unit tests.
explicit_open.patch needs review. I don't know the best way to create
a dictionary. Py_BuildValue() may be used to write a smaller patch.
open(file, mode, *, buffering, ...) may be replaced by open(file,
mode, buffering, *, ...) to keep compatibility with Python2, but I
read somewhere that Python3 breaks the compatibility and a 2to3 fixer
can be used to fix open().
components: Library (Lib)
keywords: needs review, patch, patch
title: open(): use keyword only for arguments other than file and mode
versions: Python 3.0
Added file: http://bugs.python.org/file11784/explicit_open.patch
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