Re: [Tutor] myown.getfilesystemencoding()
On 30 August 2013 17:39, eryksun eryk...@gmail.com wrote: On Fri, Aug 30, 2013 at 11:04 AM, Albert-Jan Roskam fo...@yahoo.com wrote: the function returns 850 (codepage 850) when I run it via the command prompt, but 1252 (cp1252) when I run it in my IDE (Spyder). Maybe Spyder communicates with python.exe as a subprocess in a hidden console, with the console's codepage set to 1252. You can use ctypes to check windll.kernel32.GetConsoleCP(). If a console is attached, this will return a nonzero value. Spyder has both an internal interpreter and an external interpreter. One is the same interpreter process that runs the Spyder GUI. The other is run in a subprocess which keeps the GUI safe but reduces your ability to inspect the workspace data via the GUI. So presumable Albert means the external interpreter here. Also Spyder has the option to use ipython as the shell for (I think) either interpreter and ipython does a lot of weirdness to stdin/stdout etc. (according to the complaints of the Spyder author when users asked for ipython support). Oscar ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] A mergesort
I have been searching for mergesort implimentations in python and came across this. def merge(a, b): if len(a)*len(b) == 0: return a+b v = (a[0] b[0] and a or b).pop(0) return [v] + merge(a, b) def mergesort(lst): if len(lst) 2: return lst m = len(lst)/2 return merge(mergesort(lst[:m]), mergesort(lst[m:])) mlst = [10, 9, 8, 4, 5, 6, 7, 3, 2, 1] sorted = mergesort(mlst) print sorted Besides using recursion in merge function also, it has somethings intresting. Especially the statement v = (a[0] b[0] and a or b).pop(0) gives a.pop(0), if a[0] b[0] otherwise b.pop(0). We have to look at the statement as v = ((a[0] b[0] and a) or b).pop(0) regards, Sarma. ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A mergesort
On 2013-08-31 22:00, D.V.N.Sarma డి.వి.ఎన్.శర్మ wrote: def merge(a, b): if len(a)*len(b) == 0: return a+b Indentation in Python matters; if you're going to post code, you should probably keep it. We have to look at the statement as v = ((a[0] b[0] and a) or b).pop(0) This is short circuit evaluation, which is fairly common in programming languages.[0] 0: https://en.wikipedia.org/wiki/Short-circuit_evaluation pgpaGypFOdN_q.pgp Description: PGP signature ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] A mergesort
D.V.N.Sarma డి.వి.ఎన్.శర్మ, 31.08.2013 18:30: I have been searching for mergesort implimentations in python and came across this. In case this isn't just for education and you actually want to use it, the built-in sorting algorithm in Python (used by list.sort() and sorted()) is a very fast mergesort variant. Anything you could write in Python code is bound to be slower. Stefan ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
[Tutor] how to save variables after a user quits in python
I am coding a game and I want the player to be able to quit the game and immediately take off right from where they started from. --Jack___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] how to save variables after a user quits in python
On 2013-08-31 14:30, Jack Little wrote: I am coding a game and I want the player to be able to quit the game and immediately take off right from where they started from. If you're asking how to store variables between sessions, look at the pickle module. pgpWT4yz_VlbP.pgp Description: PGP signature ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] how to save variables after a user quits in python
On 01/09/13 07:30, Jack Little wrote: I am coding a game and I want the player to be able to quit the game and immediately take off right from where they started from. That is trickier than it sounds. You have to save the internal state of the game, which means you first have to *identify* the internal state of the game. That means: * everything about the user: name, health, score, ammunition, treasure, etc.; * everything about every enemy: whether they are alive or dead, health, ammunition, etc.; * everything about the internal state of the game: which parts of the game have already been visited, which parts haven't been; * position of the user; * anything else I have forgotten. Once you have identified all of those things, then and only then can you start thinking about the best way to save that information to disk. Depending on what you need to save, you can then decide what module is best suited to that type of data. There are many choices: http://docs.python.org/2/library/persistence.html http://docs.python.org/2/library/fileformats.html http://docs.python.org/2/library/json.html http://docs.python.org/2/library/xml.html It is difficult to tell what would be best without knowing what you need to save. Possibly as little as a Windows-style INI file would be enough: [settings] key: value possibly you will need a custom solution that dumps the entire state of the Python interpreter to disk, then later restores it. -- Steven ___ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] myown.getfilesystemencoding()
On Sat, Aug 31, 2013 at 9:16 AM, Oscar Benjamin
oscar.j.benja...@gmail.com wrote:
Spyder has both an internal interpreter and an external interpreter.
One is the same interpreter process that runs the Spyder GUI. The
other is run in a subprocess which keeps the GUI safe but reduces your
ability to inspect the workspace data via the GUI. So presumable
Albert means the external interpreter here.
I installed Spyder on Windows to look into this. It's using Qt
QProcess to run the external interpreter in a child process.
sys.stdin.isatty() confirms it's not a tty, and Process Explorer
confirms that all 3 standard I/O handles (from msvcrt.get_osfhandle())
are pipes.
The file encoding is None for piped standard I/O, so printing unicode
falls back to the default encoding. Normally this is ASCII in 2.x, but
Spyder uses sitecustomize to set the default encoding based on the
default locale. It also sets the hidden console's codepage:
if os.name == 'nt': # Windows platforms
# Setting console encoding (otherwise Python does not
# recognize encoding)
try:
import locale, ctypes
_t, _cp = locale.getdefaultlocale('LANG')
try:
_cp = int(_cp[2:])
ctypes.windll.kernel32.SetConsoleCP(_cp)
ctypes.windll.kernel32.SetConsoleOutputCP(_cp)
except (ValueError, TypeError):
# Code page number in locale is not valid
pass
except ImportError:
pass
http://code.google.com/p/spyderlib/source/browse/spyderlib/
widgets/externalshell/sitecustomize.py?name=v2.2.0#74
Probably this was added for a good reason, but I don't grok the point.
Python isn't interested in the hidden console window at this stage,
and the standard handles are all pipes. I didn't notice any difference
with these lines commented out, running with Python 2.7.5. YMMV
There's a design flaw here since sys.stdin.encoding is used by the
parser in single-input mode. With it set to None, Unicode literals
entered in the REPL will be incorrectly parsed if they use non-ASCII
byte values. For example, given the input is Windows 1252, then u'€'
will be parsed as u'\x80' (i.e. PAD, a C1 Control code).
Here's an alternative to messing with the default encoding -- at least
for the new version of Spyder that doesn't have to support 2.5. Python
2.6+ checks for the PYTHONIOENCODING environment variable. This
overrides the encoding/errors values in Py_InitializeEx():
http://hg.python.org/cpython/file/70274d53c1dd/Python/pythonrun.c#l265
You can test setting PYTHONIOENCODING without restarting Spyder. Just
bring up Spyder's Internal Console and set
os.environ['PYTHONIOENCODING']. The change applies to new interpreters
started from the Interpreters menu. Spyder could set this itself in
the environment that gets passed to the QProcess object.
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