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Title: Write mode option for fileinput module.
Type: enhancement Stage: resolved
Components: Library (Lib) Versions: Python 3.8
Status: closed Resolution: fixed
Dependencies: Superseder:
Assigned To: Nosy List: antroy, berker.peksag, mkam, r.david.murray
Priority: normal Keywords: patch

Created on 2006-12-11 21:16 by antroy, last changed 2022-04-11 14:56 by admin. This issue is now closed.

File name Uploaded Description Edit
fileinput_lib_doc_test.diff antroy, 2006-12-11 21:16 Diff file of the changes described above. review
Pull Requests
URL Status Linked Edit
PR 12986 merged berker.peksag, 2019-04-27 18:12
Messages (6)
msg51510 - (view) Author: Anthony Roy (antroy) Date: 2006-12-11 21:16
The current implementation of the fileinput module allows an optional 'mode' keyword argumant to the FileInput initializer and the input() convenience function.

The attached patch provides a similar write_mode keyword argument with which to specify the write mode when the 'inplace' option is used.

Included in the patch file are:

1) Changes to the fileinput module to accomodate the optional write mode option

2) Additions to the fileinput tex documentation.

3) A refactored test module, where the tests have been reorganised into TestCase subclasses, and new tests added for the new functionality.
msg51511 - (view) Author: Martin Kammerhofer (mkam) Date: 2006-12-15 13:10
The restriction that you cannot use inplace and openhook together seems somewhat
arbitrary to me. Have you considered lifting it? From looking at the source it
seems not too hard to do. There are uses for e.g. inplace editing compressed files.
This would fit nicely with your patch.
msg51512 - (view) Author: Anthony Roy (antroy) Date: 2006-12-18 19:33
The restriction isn't entirely arbitrary as far as I can see. If you allow the combination of inplace and openhook, then you will also need a writehook option, or the ability to specify a pair of hook function for the openhook. For example, there is a function provided for opening a compressed file for reading. In order to do an inplace edit, you would need to provide a write hook to compress the data on the way back in.

I think that the implementation of such a change would be open for discussion, and is beyond the scope of a minor change as suggested in this patch. (Perhaps the topic for a future PEP).
msg110506 - (view) Author: Mark Lawrence (BreamoreBoy) * Date: 2010-07-16 21:43
This looks like a sizeable patch but the bulk of the changes are to  Assigning to myself to take forward, I've got to start sometime.  Before I really start moving are there any basic objections to either the original proposal or me having a bash?
msg182899 - (view) Author: R. David Murray (r.david.murray) * (Python committer) Date: 2013-02-24 22:16
As far as I can see from a quick look, the problem this patch addresses still exists in Python3, and in Python3 it be (more of?) a bug.  That is, the output file is opened in text mode, regardless of whether the input mode was text or bytes.  I'm not sure about the solution; it seems like it makes more sense to deduce the output mode from the input mode.

The test changes, though, are obsolete.
msg341089 - (view) Author: Berker Peksag (berker.peksag) * (Python committer) Date: 2019-04-29 14:55
New changeset be6dbfb43b89989ccc83fbc4c5234f50f44c47ad by Berker Peksag in branch 'master':
bpo-1613500: Don't hardcode output file mode in fileinput.FileInput (GH-12986)
Date User Action Args
2022-04-11 14:56:21adminsetgithub: 44329
2019-04-29 14:56:18berker.peksagsetstatus: open -> closed
stage: patch review -> resolved
resolution: fixed
versions: + Python 3.8, - Python 3.5
2019-04-29 14:55:59berker.peksagsetnosy: + berker.peksag
messages: + msg341089
2019-04-27 18:12:12berker.peksagsetpull_requests: + pull_request12909
2014-02-03 18:39:58BreamoreBoysetnosy: - BreamoreBoy
2013-02-24 22:16:38r.david.murraysetversions: + Python 3.5, - Python 3.2
nosy: + r.david.murray

messages: + msg182899

assignee: BreamoreBoy ->
2010-07-16 21:43:45BreamoreBoysetversions: + Python 3.2, - Python 3.1, Python 2.7
nosy: + BreamoreBoy

messages: + msg110506

assignee: BreamoreBoy
2009-03-30 18:00:45ajaksu2setstage: patch review
type: enhancement
versions: + Python 3.1, Python 2.7
2006-12-11 21:16:56antroycreate