Mailman 3 September 2012 - Python-Dev

Should 2to3 convert Exceptions from
by anatoly techtonik 03 Sep '12

03 Sep '12

I work offline from remote location about 2000m above the sea level. There is no internet connection here, so I can not use tracker online. I need a Python editor here, and I have Spyder checkout. The problem is that my installation has only Python3. I've tried using 2to3 from setup.py (attached), but it fails when I execute: $ sudo python3 setup.py install stderr.log and stdout.log are attached. Is it the intended behavior? It is also hard find "Porting Python 2 Code to Python 3" article, because it is not referenced from "Porting to Python 3.x" chapters. -- -- anatoly t.

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Re: [Python-Dev] [Python-ideas] itertools.chunks(iterable, size, fill=None)
by anatoly techtonik 02 Sep '12

02 Sep '12

I've run into the necessity of implementing chunks() again. Here is the code I've made from scratch. def chunks(seq, size): '''Cut sequence into chunks of given size. If `seq` length is not divisible by `size` without reminder, last chunk will have length less than size. >>> list( chunks([1,2,3,4,5,6,7], 3) ) [[1, 2, 3], [4, 5, 6], [7]] ''' endlen = len(seq)//size for i in range(endlen): yield [seq[i*size+n] for n in range(size)] if len(seq) % size: yield seq[endlen*size:] -- anatoly t. On Fri, Jun 29, 2012 at 11:32 PM, Georg Brandl <g.brandl(a)gmx.net> wrote: > On 26.06.2012 10:03, anatoly techtonik wrote: >> >> Now that Python 3 is all about iterators (which is a user killer >> feature for Python according to StackOverflow - >> http://stackoverflow.com/questions/tagged/python) would it be nice to >> introduce more first class functions to work with them? One function >> to be exact to split string into chunks. >> >> itertools.chunks(iterable, size, fill=None) >> >> Which is the 33th most voted Python question on SO - >> >> http://stackoverflow.com/questions/312443/how-do-you-split-a-list-into-even… >> >> P.S. CC'ing to python-dev@ to notify about the thread in python-ideas. >> > > Anatoly, so far there were no negative votes -- would you care to go > another step and propose a patch? > > > Georg > > _______________________________________________ > Python-ideas mailing list > Python-ideas(a)python.org > http://mail.python.org/mailman/listinfo/python-ideas

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Unicode support of the curses module in Python 3.3
by Victor Stinner 02 Sep '12

02 Sep '12

Hi, I changed many functions of the curses module in Python 3.3 to improve its Unicode support: - new functions: curses.unget_wch() and window.get_wch() - new attribute: window.encoding - the default encoding is now the locale encoding instead of UTF-8 - use the C functions *_wch() and *wstr() when available instead of *ch() and *str() functions. For example, the Python function addstr() calls waddwstr() and addch(str) calls wadd_wch() (addch(int) and addch(bytes) are still calling waddch()) Most new features related to Unicode now depends if the Python curses module is linked to the C libncursesw library or not... and the Python module is not linked to libncursesw if the libreadline library is linked to libncurses module. How the readline library is linked to libncurses/libncursesw is not a new problem but it may become more annoying than before. I hope that most Linux distro are/will link readline to libncursesw. For example, if the Python curses module is not linked to libncursesw, get_wch() is not available and addch("é") raises an OverflowError if the locale encoding is UTF-8 (because "é".encode("utf-8") is longer than 1 byte). I introduced two bugs: get_wch() didn't support keycodes (like curses.KEY_UP) and addch() didn't work anymore with special characters like curses.ACS_HLINE. These issues are referenced as #15785 and #14223 in the bug tracker, and I pushed fixes: c58789634d22 and 27b5bd5f0e4c. I hope that Georg will accept them in Python 3.3 final! I didn't find these bugs myself because I only used dummy scripts to test my changes. Does anyone know "real world" applications using the curses module and supporting Python 3? Can you please test them with non-ASCII characters and the last development version of Python 3.3? So please try to test the curses module before Python 3.3 final with your favorite application! Victor

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