Message 256291 - Python tracker

➜

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.

In-reply-to
Author	socketpair
Recipients	ezio.melotti, socketpair, vstinner
Date	2015年12月12日.20:19:49
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1449951589.63.0.511826880998.issue25849@psf.upfronthosting.co.za>

Content
It seems, that we should deprecate .seek() on files, opened in text mode. Since it is not possible to seek to position between symbols. Yes, it is possible to decode UTF-8 (or other charset) starting from beginning of the file and count symbols, but it is EXTREMELY SLOW, and is not what user expect. If so, seeking from end of file back to begin may be implemented in even more hard and error-prone way. Moreover, I consider that we should disallow seek in text files except seek() to begin of the file (position 0) or end of file (seek(0, SEEK_END)). Seel also issue25190 #25190 about something related for that.

Content

It seems, that we should deprecate .seek() on files, opened in text mode.
Since it is not possible to seek to position between symbols. Yes, it is possible to decode UTF-8 (or other charset) starting from beginning of the file and count symbols, but it is EXTREMELY SLOW, and is not what user expect. If so, seeking from end of file back to begin may be implemented in even more hard and error-prone way.
Moreover, I consider that we should disallow seek in text files except seek() to begin of the file (position 0) or end of file (seek(0, SEEK_END)).
Seel also issue25190 #25190 about something related for that.

History
Date	User	Action	Args
2015年12月12日 20:19:49	socketpair	set	recipients: + socketpair, vstinner, ezio.melotti
2015年12月12日 20:19:49	socketpair	set	messageid: <1449951589.63.0.511826880998.issue25849@psf.upfronthosting.co.za>
2015年12月12日 20:19:49	socketpair	link	issue25849 messages
2015年12月12日 20:19:49	socketpair	create

homepage