Re: Python 3.1 beta 1
On May 7, 11:57 am, bearophileh...@lycos.com wrote:
Equality tests between OrderedDict objects are order-sensitive and are
implemented as list(od1.items())==list(od2.items()). Equality tests between
OrderedDict objects and other Mapping objects are order-insensitive
very nice idea.
I don't know if somebody else is interested but I wouldn't mind
support to OrderedDict and namedtuple in the csv module:
Have csv.DictReader return an OrderedDict instead of a regular one
(based on the order of the column names in the header line).
Have csv.DictWriter accept an OrderedDict. That would take care of
this:
Note that unlike the DictReader class, the fieldnames parameter of
the DictWriter is not optional. Since Python’s dict objects are not
ordered, there is not enough information available to deduce the order
in which the row should be written to the csvfile.
http://docs.python.org/dev/py3k/library/csv.html#csv.DictWriter
Add a new csv.NamedTupleReader and csv.NamedTupleWriter that work
similar to the DictReader and DictWriter then this snippet (in
examples
http://docs.python.org/dev/py3k/library/collections.html#collections.namedtuple
):
EmployeeRecord = namedtuple('EmployeeRecord', 'name, age, title,
department, paygrade')
import csv
for emp in map(EmployeeRecord._make, csv.reader(open(employees.csv,
rb))):
print(emp.name, emp.title)
Could be rewritten as:
import csv
for emp in csv.NamedTupleReader(employees.csv):
print(emp.name, emp.title)
Also, is there a way to convert a OrderedDict into a namedtuple? It is
possible to go the other direction using namedtuple._asdict, but I
don't see a _fromdict method.
And thanks Steven and Raymond for the Counter class. Several people
had started to see the common pattern and now we have it in the
stdlib.
--
http://mail.python.org/mailman/listinfo/python-list
Re: Python 3.1 beta 1
On May 7, 6:33 pm, Benjamin Peterson benja...@python.org wrote: pruebauno at latinmail.com writes: Congratulations! Thanks! Is it just me or was some nice summary output added to the make process? I get a nice list of modules that didn't compile and the ones where the library could not be found. Are you compiling on a different platform? The nice output has been around for a while, bu only on non-Windows platforms. Not really, I was on AIX. It is probably just me then, probably because for the first time I see it making it through the whole process even with the Tkinter libraries missing. -- http://mail.python.org/mailman/listinfo/python-list
[RELEASED] Python 3.1 beta 1
On behalf of the Python development team, I'm thrilled to announce the first and only beta release of Python 3.1. Python 3.1 focuses on the stabilization and optimization of features and changes Python 3.0 introduced. For example, the new I/O system has been rewritten in C for speed. File system APIs that use unicode strings now handle paths with undecodable bytes in them. [1] Other features include an ordered dictionary implementation and support for ttk Tile in Tkinter. For a more extensive list of changes in 3.1, see http://doc.python.org/dev/py3k/whatsnew/3.1.html or Misc/NEWS in the Python distribution. Please note that this is a beta release, and as such is not suitable for production environments. We continue to strive for a high degree of quality, but there are still some known problems and the feature sets have not been finalized. This beta is being released to solicit feedback and hopefully discover bugs, as well as allowing you to determine how changes in 3.1 might impact you. If you find things broken or incorrect, please submit a bug report at http://bugs.python.org For more information and downloadable distributions, see the Python 3.1 website: http://www.python.org/download/releases/3.1/ See PEP 375 for release schedule details: http://www.python.org/dev/peps/pep-0375/ Enjoy, -- Benjamin Benjamin Peterson benjamin at python.org Release Manager (on behalf of the entire python-dev team and 3.1's contributors) -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
Re: [Python-Dev] [RELEASED] Python 3.1 beta 1
On behalf of the Python development team, I'm thrilled to announce the first and only beta release of Python 3.1. .. Other features include an ordered dictionary implementation Are there plans for backporting this to python 2.x just as multiprocessing has been? I know that there are several ordered dictionary implementations for 2.x but they are all a little bit different from the one going into 3.1, hence my question. Cheers, Daniel -- Psss, psss, put it down! - http://www.cafepress.com/putitdown -- http://mail.python.org/mailman/listinfo/python-list
Re: [Python-Dev] [RELEASED] Python 3.1 beta 1
Daniel Fetchinson wrote: Other features include an ordered dictionary implementation Are there plans for backporting this to python 2.x just as multiprocessing has been? Why not grab the 3.1 code and do it yourself for your 2.X's? It should be far less work than attempting something as fidgety as multiprocessing. --Scott David Daniels scott.dani...@acm.org -- http://mail.python.org/mailman/listinfo/python-list
Re: [Python-Dev] [RELEASED] Python 3.1 beta 1
On Thu, May 7, 2009 at 9:12 AM, Scott David Daniels scott.dani...@acm.org wrote: Daniel Fetchinson wrote: Other features include an ordered dictionary implementation Are there plans for backporting this to python 2.x just as multiprocessing has been? Why not grab the 3.1 code and do it yourself for your 2.X's? It should be far less work than attempting something as fidgety as multiprocessing. --Scott David Daniels scott.dani...@acm.org Don't worry, we gave multiprocessing some ADHD meds :) -- http://mail.python.org/mailman/listinfo/python-list
Re: [RELEASED] Python 3.1 beta 1
On May 7, 9:12 am, Scott David Daniels scott.dani...@acm.org wrote: Daniel Fetchinson wrote: Other features include an ordered dictionary implementation Are there plans for backporting this to python 2.x just as multiprocessing has been? Why not grab the 3.1 code and do it yourself for your 2.X's? It should be far less work than attempting something as fidgety as multiprocessing. --Scott David Daniels scott.dani...@acm.org If OrderedDict winds up being backported, will you include it in 2.x? Geremy Condra -- http://mail.python.org/mailman/listinfo/python-list
Re: [RELEASED] Python 3.1 beta 1
CTO wrote: ... If OrderedDict winds up being backported, will you include it in 2.x? I see it in the 2.7 sources. --Scott David Daniels scott.dani...@acm.org -- http://mail.python.org/mailman/listinfo/python-list
Re: Python 3.1 beta 1
I appreciate the tables Infinite Iterators and Iterators terminating on the shortest input sequence at the top of the itertools module, they are quite handy. I'd like to see similar summary tables at the top of other docs pages too (such pages are often quite long), for example the collections docs page. collections.Counter and collections.OrderedDict: very nice and useful. Is the order inside OrderedDict kept with a double linked list of the items? Counter.most_common([n]): a good idea. If I need a dictionary that is both ordered and has a default too I can't combine their qualities (but I can use the __missing__(key) hook). Equality tests between OrderedDict objects are order-sensitive and are implemented as list(od1.items())==list(od2.items()). Equality tests between OrderedDict objects and other Mapping objects are order-insensitive very nice idea. The OrderedDict constructor and update() method both accept keyword arguments, but their order is lost because Python's function call semantics pass-in keyword arguments using a regular unordered dictionary. This is unfortunate :-( Well, I'd like function call semantics pass-in keyword arguments to use OrderedDicts then... :-) Several mathematical operations are provided for combining Counter objects to produce multisets Very nice. itertools.count(): when increments are non-integer I hope the results are computed with a multiplication instead an interated sum, to increase precision. Issue 4688 and the work by Antoine Pitrou: interesting GC optimization. The performance difference of the BinaryTrees benchmark is big. Bye, bearophile -- http://mail.python.org/mailman/listinfo/python-list
[RELEASED] Python 3.1 beta 1
On behalf of the Python development team, I'm thrilled to announce the first and only beta release of Python 3.1. Python 3.1 focuses on the stabilization and optimization of features and changes Python 3.0 introduced. For example, the new I/O system has been rewritten in C for speed. File system APIs that use unicode strings now handle paths with undecodable bytes in them. [1] Other features include an ordered dictionary implementation and support for ttk Tile in Tkinter. For a more extensive list of changes in 3.1, see http://doc.python.org/dev/py3k/whatsnew/3.1.html or Misc/NEWS in the Python distribution. Please note that this is a beta release, and as such is not suitable for production environments. We continue to strive for a high degree of quality, but there are still some known problems and the feature sets have not been finalized. This beta is being released to solicit feedback and hopefully discover bugs, as well as allowing you to determine how changes in 3.1 might impact you. If you find things broken or incorrect, please submit a bug report at http://bugs.python.org For more information and downloadable distributions, see the Python 3.1 website: http://www.python.org/download/releases/3.1/ See PEP 375 for release schedule details: http://www.python.org/dev/peps/pep-0375/ Enjoy, -- Benjamin Benjamin Peterson benjamin at python.org Release Manager (on behalf of the entire python-dev team and 3.1's contributors) -- http://mail.python.org/mailman/listinfo/python-list
Re: Python 3.1 beta 1
On May 6, 9:32 pm, Benjamin Peterson benja...@python.org wrote: On behalf of the Python development team, I'm thrilled to announce the first and only beta release of Python 3.1. Python 3.1 focuses on the stabilization and optimization of features and changes Python 3.0 introduced. For example, the new I/O system has been rewritten in C for speed. File system APIs that use unicode strings now handle paths with undecodable bytes in them. [1] Other features include an ordered dictionary implementation and support for ttk Tile in Tkinter. For a more extensive list of changes in 3.1, seehttp://doc.python.org/dev/py3k/whatsnew/3.1.htmlor Misc/NEWS in the Python distribution. Please note that this is a beta release, and as such is not suitable for production environments. We continue to strive for a high degree of quality, but there are still some known problems and the feature sets have not been finalized. This beta is being released to solicit feedback and hopefully discover bugs, as well as allowing you to determine how changes in 3.1 might impact you. If you find things broken or incorrect, please submit a bug report at http://bugs.python.org For more information and downloadable distributions, see the Python 3.1 website: http://www.python.org/download/releases/3.1/ See PEP 375 for release schedule details: http://www.python.org/dev/peps/pep-0375/ Enjoy, -- Benjamin Benjamin Peterson benjamin at python.org Release Manager (on behalf of the entire python-dev team and 3.1's contributors) Congratulations! Is it just me or was some nice summary output added to the make process? I get a nice list of modules that didn't compile and the ones where the library could not be found. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python 3.1 beta 1
bearophileh...@lycos.com wrote: Is the order inside OrderedDict kept with a double linked list of the items? That is one of the things Raymond tried. Check the code for what he settled on for the Python version. I believe he thinks the best C implementation might be different from the best Python version. The OrderedDict constructor and update() method both accept keyword arguments, but their order is lost because Python's function call semantics pass-in keyword arguments using a regular unordered dictionary. This is unfortunate :-( Well, I'd like function call semantics pass-in keyword arguments to use OrderedDicts then... :-) This possibility has been discussed on pydev. It would require a sufficiently fast C implementation. tjr -- http://mail.python.org/mailman/listinfo/python-list
Re: Python 3.1 beta 1
Terry Reedy: bearophile: Well, I'd like function call semantics pass-in keyword arguments to use OrderedDicts then... :-) [...] It would require a sufficiently fast C implementation. Right. Such dict is usually small, so if people want it ordered, it may be better to just use an array of name-value structs instead of a dict or ordered dict. Iterating on a 10-pair array is fast on modern CPUs. Bye, bearophile -- http://mail.python.org/mailman/listinfo/python-list
Re: Python 3.1 beta 1
pruebauno at latinmail.com writes: Congratulations! Thanks! Is it just me or was some nice summary output added to the make process? I get a nice list of modules that didn't compile and the ones where the library could not be found. Are you compiling on a different platform? The nice output has been around for a while, bu only on non-Windows platforms. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python 3.1 beta 1
bearophileHUGS at lycos.com writes: collections.Counter and collections.OrderedDict: very nice and useful. Is the order inside OrderedDict kept with a double linked list of the items? There's a doubly-linked list containing the values. Another dictionary maps keys to the list. -- http://mail.python.org/mailman/listinfo/python-list
[RELEASED] Python 3.1 beta 1
On behalf of the Python development team, I'm thrilled to announce the first and only beta release of Python 3.1. Python 3.1 focuses on the stabilization and optimization of features and changes Python 3.0 introduced. For example, the new I/O system has been rewritten in C for speed. File system APIs that use unicode strings now handle paths with undecodable bytes in them. [1] Other features include an ordered dictionary implementation and support for ttk Tile in Tkinter. For a more extensive list of changes in 3.1, see http://doc.python.org/dev/py3k/whatsnew/3.1.html or Misc/NEWS in the Python distribution. Please note that this is a beta release, and as such is not suitable for production environments. We continue to strive for a high degree of quality, but there are still some known problems and the feature sets have not been finalized. This beta is being released to solicit feedback and hopefully discover bugs, as well as allowing you to determine how changes in 3.1 might impact you. If you find things broken or incorrect, please submit a bug report at http://bugs.python.org For more information and downloadable distributions, see the Python 3.1 website: http://www.python.org/download/releases/3.1/ See PEP 375 for release schedule details: http://www.python.org/dev/peps/pep-0375/ Enjoy, -- Benjamin Benjamin Peterson benjamin at python.org Release Manager (on behalf of the entire python-dev team and 3.1's contributors) -- http://mail.python.org/mailman/listinfo/python-announce-list Support the Python Software Foundation: http://www.python.org/psf/donations.html
[RELEASED] Python 3.1 beta 1
On behalf of the Python development team, I'm thrilled to announce the first and only beta release of Python 3.1. Python 3.1 focuses on the stabilization and optimization of features and changes Python 3.0 introduced. For example, the new I/O system has been rewritten in C for speed. File system APIs that use unicode strings now handle paths with undecodable bytes in them. [1] Other features include an ordered dictionary implementation and support for ttk Tile in Tkinter. For a more extensive list of changes in 3.1, see http://doc.python.org/dev/py3k/whatsnew/3.1.html or Misc/NEWS in the Python distribution. Please note that this is a beta release, and as such is not suitable for production environments. We continue to strive for a high degree of quality, but there are still some known problems and the feature sets have not been finalized. This beta is being released to solicit feedback and hopefully discover bugs, as well as allowing you to determine how changes in 3.1 might impact you. If you find things broken or incorrect, please submit a bug report at http://bugs.python.org For more information and downloadable distributions, see the Python 3.1 website: http://www.python.org/download/releases/3.1/ See PEP 375 for release schedule details: http://www.python.org/dev/peps/pep-0375/ Enjoy, -- Benjamin Benjamin Peterson benjamin at python.org Release Manager (on behalf of the entire python-dev team and 3.1's contributors) -- http://mail.python.org/mailman/listinfo/python-list
