Message 252335 - Python tracker

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In-reply-to
Author	vstinner
Recipients	ezio.melotti, serhiy.storchaka, vstinner
Date	2015年10月05日.16:17:29
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1444061849.35.0.621229334835.issue25318@psf.upfronthosting.co.za>

Content
My previous abandonned attempt was the issue #17742. "Add _PyBytesWriter API to optimize Unicode encoders" Oh, I forgot to mention and it may also be used to optimize bytes % args. More generally, any code generating a bytes object with an unknown length is advance. Said differently: _PyBytesWriter can be used when precomputing the output length is more expensive. str % args now uses _PyUnicodeWriter but building an Unicode string is even more complex because of the different Unicode "kinds": 1, 2 or 4 bytes per character.

Content

My previous abandonned attempt was the issue #17742.
"Add _PyBytesWriter API to optimize Unicode encoders"
Oh, I forgot to mention and it may also be used to optimize bytes % args. More generally, any code generating a bytes object with an unknown length is advance. Said differently: _PyBytesWriter can be used when precomputing the output length is more expensive.
str % args now uses _PyUnicodeWriter but building an Unicode string is even more complex because of the different Unicode "kinds": 1, 2 or 4 bytes per character.

History
Date	User	Action	Args
2015年10月05日 16:17:29	vstinner	set	recipients: + vstinner, ezio.melotti, serhiy.storchaka
2015年10月05日 16:17:29	vstinner	set	messageid: <1444061849.35.0.621229334835.issue25318@psf.upfronthosting.co.za>
2015年10月05日 16:17:29	vstinner	link	issue25318 messages
2015年10月05日 16:17:29	vstinner	create

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