* Add also min_char attribute to _PyUnicodeWriter structure (currently unused)
* _PyUnicodeWriter_Init() has no more argument (except the writer itself):
min_length and overallocate must be set explicitly
* In error handlers, only enable overallocation if the replacement string
is longer than 1 character
* CJK decoders don't use overallocation anymore
* Set min_length, instead of preallocating memory using
_PyUnicodeWriter_Prepare(), in many decoders
* _PyUnicode_DecodeUnicodeInternal() checks for integer overflow
Write a function to enable more optimizations:
* If the substring is the whole string and overallocation is disabled, just
keep a reference to the string, don't copy characters
* Avoid a call to the expensive _PyUnicode_FindMaxChar() function when
possible
* Formatting string, int, float and complex use the _PyUnicodeWriter API. It
avoids a temporary buffer in most cases.
* Add _PyUnicodeWriter_WriteStr() to restore the PyAccu optimization: just
keep a reference to the string if the output is only composed of one string
* Disable overallocation when formatting the last argument of str%args and
str.format(args)
* Overallocation allocates at least 100 characters: add min_length attribute
to the _PyUnicodeWriter structure
* Add new private functions: _PyUnicode_FastCopyCharacters(),
_PyUnicode_FastFill() and _PyUnicode_FromASCII()
The speed up is around 20% in average.
svn+ssh://pythondev@svn.python.org/python/trunk
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r81820 | benjamin.peterson | 2010-06-07 17:23:23 -0500 (Mon, 07 Jun 2010) | 1 line
correctly overflow when indexes are too large
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svn+ssh://pythondev@svn.python.org/python/trunk
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r81820 | benjamin.peterson | 2010-06-07 17:23:23 -0500 (Mon, 07 Jun 2010) | 1 line
correctly overflow when indexes are too large
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svn+ssh://pythondev@svn.python.org/python/trunk
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r72159 | georg.brandl | 2009-05-01 10:51:37 +0200 (Fr, 01 Mai 2009) | 2 lines
#5889: remove comma at the end of a list that some C compilers don't like.
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svn+ssh://pythondev@svn.python.org/python/trunk
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r70364 | eric.smith | 2009-03-14 07:57:26 -0400 (Sat, 14 Mar 2009) | 17 lines
Issue 5237, Allow auto-numbered replacement fields in str.format() strings.
For simple uses for str.format(), this makes the typing easier. Hopfully this
will help in the adoption of str.format().
For example:
'The {} is {}'.format('sky', 'blue')
You can mix and matcth auto-numbering and named replacement fields:
'The {} is {color}'.format('sky', color='blue')
But you can't mix and match auto-numbering and specified numbering:
'The {0} is {}'.format('sky', 'blue')
ValueError: cannot switch from manual field specification to automatic field numbering
Will port to 3.1.
........
For simple uses for str.format(), this makes the typing easier. Hopfully this
will help in the adoption of str.format().
For example:
'The {} is {}'.format('sky', 'blue')
You can mix and matcth auto-numbering and named replacement fields:
'The {} is {color}'.format('sky', color='blue')
But you can't mix and match auto-numbering and specified numbering:
'The {0} is {}'.format('sky', 'blue')
ValueError: cannot switch from manual field specification to automatic field numbering
Will port to 3.1.
Optimization of str.format() for cases with str, unicode, int, long,
and float arguments. This gives about 30% speed improvement for the
simplest (but most common) cases. This patch skips the __format__
dispatch, and also avoids creating an object to hold the format_spec.
Unfortunately there's a complication in 2.6 with int, long, and float
because they always expect str format_specs. So in the unicode
version of this optimization, just check for unicode objects. int,
float, long, and str can be added later, if needed.
The repr() of a string now contains printable Unicode characters unescaped.
The new ascii() builtin can be used to get a repr() with only ASCII characters in it.
PEP and patch were written by Atsuo Ishimoto.
arguments. This gives about 30% speed improvement for the simplest
(but most common) cases. This patch skips the __format__ dispatch, and
also avoids creating an object to hold the format_spec.
Unfortunately, backporting this to 2.6 is going to be more challenging
due to str/unicode issues with format_spec. I'll work on that next.
Then I'll spend some time profiling and see what that tells me.
Benjamin Peterson
Victor Stinner
Serhiy Storchaka
Victor Stinner
Antoine Pitrou
Martin v. Löwis
Mark Dickinson
Eric V. Smith
Ezio Melotti
Georg Brandl
Mark Dickinson
Gregory P. Smith
Christian Heimes