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Created on 2016-09-29 09:01 by serhiy.storchaka, last changed 2022-04-11 14:58 by admin.
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| File name | Uploaded | Description | Edit | |
| faster_template.patch | serhiy.storchaka, 2016-09-29 09:02 | |||
| Messages (1) | |||
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| msg277690 - (view) | Author: Serhiy Storchaka (serhiy.storchaka) *  |
Date: 2016-09-29 09:01 | |
Proposed patch makes string.Template compiling template to formatted string literal. Since for now using formatted string literals is the fastest way of formatting strings, this significantly speeds up Template substitution.
$ ./python -m perf timeit -s 'from string import Template; s = Template("$who likes $what")' -- 's.substitute(who="tim", what="ham")'
Unpatched: Median +- std dev: 46.1 us +- 4.2 us
Patched: Median +- std dev: 11.1 us +- 0.5 us
The drawback is that compiling template adds high overhead.
$ ./python -m perf timeit -s 'from string import Template' -- 's = Template("$who likes $what"); s.substitute(who="tim", what="ham")'
Unpatched: Median +- std dev: 51.7 us +- 1.5 us
Patched: Median +- std dev: 672 us +- 38 us
The benefit of using compiled templates is achieved only if make at least 20 substitutions with the same template.
Third-party template engines can use the same approach in Python 3.6+.
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:58:37 | admin | set | github: 72496 |
| 2016-09-29 09:02:14 | serhiy.storchaka | set | files:
+ faster_template.patch keywords: + patch |
| 2016-09-29 09:01:26 | serhiy.storchaka | create | |