Issue 1514451: zipfile "append" mode should create a file if not present (original) (raw)

Issue1514451

➜

This issue tracker has been migrated to GitHub, and is currently read-only.
For more information, see the GitHub FAQs in the Python's Developer Guide.

classification

Title:	zipfile "append" mode should create a file if not present
Type:	Stage:
Components:	Library (Lib)	Versions:	Python 2.4

process

Status:	closed	Resolution:	fixed
Dependencies:		Superseder:
Assigned To:		Nosy List:	gregory.p.smith, krumms, loewis, riteshsarraf
Priority:	normal	Keywords:

Created on 2006-06-29 16:42 by riteshsarraf, last changed 2022-04-11 14:56 by admin. This issue is now closed.

Messages (4)
msg28975 - (view)	Author: Ritesh Raj Sarraf (riteshsarraf)	Date: 2006-06-29 16:42
The line filename = zipfile.ZipFile(zip_file_name, "a") throws an exception if the given filename is not present already. Shouldn't it create a file (in case one is not there) since it is "append" mode ?? It's throwing an OSError Exception stating "No such file/directory". Normal convention has been that when opening a file in append mode, if the file is not present a new file is created. Why is this non-standard?
msg28976 - (view)	Author: Thomas Lee (krumms)	Date: 2006-07-06 02:31
Logged In: YES user_id=315535 Patch #1517891 resolves this. See: http://sourceforge.net/tracker/index.php?func=detail&aid=1517891&group_id=5470&atid=305470 Waiting for review.
msg28977 - (view)	Author: Gregory P. Smith (gregory.p.smith) *	Date: 2006-07-08 17:38
Logged In: YES user_id=413 I agree. append semantics generally mean append or create. +1 from me on fixing this bug. if any existing code is depending on the side effect from opening a zip file in 'a' mode to tell them that it doesn't already exist this change would break that; but I'd argue that such code is already broken and should be cleaned up.
msg28978 - (view)	Author: Martin v. Löwis (loewis) *	Date: 2007-02-13 10:10
Technically, this is not a bug, as the documentation clearly states that 'a' should open existing files. For 2.6, the behavior is changed with said patch.