gmane.comp.python.general

Smallest/cheapest possible Python platform?

Roy Smith — 2012-05-26T15:34:19

What's the smallest/cheapest/lowest-power hardware platform I can run 
Python on today?  I'm looking for something to use as a hardware 
controller in a battery-powered device and want to avoid writing in C 
for this project.

Performance requirements are minimal.  I need to monitor a few switches, 
control a couple of LEDs and relays, and keep time over about a 30 
minute period to 1/10th second accuracy.  Nice-to-have (but not 
essential) would be a speech synthesizer with a vocabulary of maybe 50 
words.

The Rasberry Pi certainly looks attractive, but isn't quite available 
today.  Can you run Python on an Arduino?  Things like 
http://www.embeddedarm.com/products/board-detail.php?product=TS-7250 are 
more than I need, and the $129 price probably busts my budget.

How to import Webkit and object in Official Python (not MacPortspython) without X11.

Mr.T Beppu — 2012-05-26T13:31:36

I think that I will make a browser in Official Python (not MacPorts
Python).
What should I do in order to install Webkit for Official Python (not
MacPorts Python) ?
from tokyo Japan.

Automatically caching computationally intensive variable values?

Alec Taylor — 2012-05-26T10:30:16

I am working with a few corpora included in nltk-data with NTLK
(http://nltk.org/) to figure out certain algorithms.

So my code would generally be something of the style:

import re, nltk, random
from nltk.corpus import reuters

def find_test_and_train_data():
return [fileid for fileid in reuters.fileids() if
re.match(r"^training/", fileid)], [fileid for fileid in
reuters.fileids() if re.match(r"^test/", fileid)]

def generate_random_data(train_and_test_fileids):
random.seed(348) ; random.shuffle(train_and_test_fileids[0])
return train_and_test_fileids[0][2000:], train_and_test_fileids[0][:2000]

def fileid_words(fileid):
return [word.lower() for line in reuters.words(fileid) for word in
line.split() if re.match('^[A-Za-z]+$', word)]

if __name__ == '__main__':
train_fileids, dev_fileids = generate_random_data(find_test_and_train_data())
train_data=fileid_words(train_fileids)
dev_data=fileid_words(dev_fileids)

So if I run it into an interactive interpreter I can then perform
tasks on `train_data`, `dev_data` and their corresponding fileids
without repopulating the variables (a very time consuming task, e.g.:
this takes 7 minutes to run each time).

However, I want to be able to write it into a .py file so that I can
save statistically interesting algorithms.

I could do this by double-typing, e.g.: when I get a function working
in the interpreter I then copy+paste it into the .py file, but this is
quite inefficient and I lose out on my IDEs' features.

Are there any IDEs or Python modules which can automatically keep the
Python script running in memory, or store the value of a variable—such
as `test_data`—in a db?

Thanks for all suggestions

usenet reading

Jon Clements — 2012-05-25T22:38:55

Hi All,

Normally use Google Groups but it's becoming absolutely frustrating - not only has the interface changed to be frankly impractical, the posts are somewhat random of what appears, is posted and whatnot. (Ironically posted from GG)

Is there a server out there where I can get my news groups? I use to be with an ISP that hosted usenet servers, but alas, it's no longer around...

Only really interested in Python groups and C++.

Any advice appreciated,

Jon.

PEP 405 vs 370

Damjan Georgievski — 2012-05-25T19:45:23

http://www.python.org/dev/peps/pep-0405/

I don't get what PEP 405 (Python Virtual Environments) brings vs what we 
already had in PEP 370 since Python 2.6.

Obviously 405 has a tool to create virtual environments, but that's 
trivial for PEP 370 [1], and has support for isolation from the 
system-wide site patch which could've been added in addition to PEP 370.

So maybe I'm missing something?


[1]
PYTHONUSERBASE=~/my-py-venv pip install --user Whatever
will create ~/my-py-venv and everything under it as needed

PYTHONUSERBASE=~/my-py-venv python setup.py install --user
the same without pip

SQLObject 1.3.1

Oleg Broytman — 2012-05-25T19:45:51

Hello!

I'm pleased to announce version 1.3.1, the first bug-fix release of branch
1.3 of SQLObject.


What is SQLObject
=================

SQLObject is an object-relational mapper.  Your database tables are described
as classes, and rows are instances of those classes.  SQLObject is meant to be
easy to use and quick to get started with.

SQLObject supports a number of backends: MySQL, PostgreSQL, SQLite,
Firebird, Sybase, MSSQL and MaxDB (also known as SAPDB).


Where is SQLObject
==================

Site:
http://sqlobject.org

Development:
http://sqlobject.org/devel/

Mailing list:
https://lists.sourceforge.net/mailman/listinfo/sqlobject-discuss

Archives:
http://news.gmane.org/gmane.comp.python.sqlobject

Download:
http://pypi.python.org/pypi/SQLObject/1.3.1

News and changes:
http://sqlobject.org/News.html


What's New
==========

* Fixed a minor bug in PostgreSQL introspection: VIEWs don't have
  PRIMARY KEYs - use sqlmeta.idName as the key.

* Fixed a bug in cache handling while unpickling.

For a more complete list, please see the news:
http://sqlobject.org/News.html

Oleg.

getting started

Harvey Greenberg — 2012-05-25T13:12:58

elementary ques...I set
s.name = ["a","b"]
s.value = [3,5]

I get error that s is not defined.  How do I define s and proceed to
give its attributes?

installing 2 and 3 alongside on MS Windows

Ulrich Eckhardt — 2012-05-25T08:24:06

Hi!

I'm using Python 2.7 for mostly unit testing here. I'm using
Boost.Python to wrap C++ code into a module, in another place I'm also
embedding Python as interpreter into a test framework. This is the stuff
that must work, it's important for production use. I'm running MS
Windows XP here and developing C++ with VS2005/VC8.

What I'm considering is installing Python 3 alongside, in order to
prepare the code for this newer version. What I'd like to know first is
whether there are any problems I'm likely to encounter and possible
workarounds.

Thank you!

Uli

PS: Dear lazyweb, is there any way to teach VC8 some syntax highlighting
for Python?

Is there a custom fields plugin or component of django

kevon wang — 2012-05-25T02:53:48

I want to find a plugin of django what it can custom fields in the form. The functions include custom fields in web page and create the fields in database.

plugin's flow like these:
1.we can define fields in web page  

 --> 2.create the table in database(table includes all custom fields)

--> 3.generate CURD operations in web server 

--> 4.we can CURD records in web pages.

I want to know whether there is a plugin or component of django, If there is please tell me. Maybe there is the other plugin like this as well.

Scoping Issues

SherjilOzair — 2012-05-25T01:23:18

def adder():
s = 0
def a(x):
    s += x
    return sum
return a

pos, neg = adder(), adder()
for i in range(10):
print pos(i), neg(-2*i)

This should work, right? Why does it not?

Checkout slide no. 37 of a Tour of Go to know inspiration. Just wanted to see if python was the same as Go in this regard. Sorry, if I'm being rude, or anything.

Help doing it the "python way"

Scott Siegler — 2012-05-24T20:22:43

Hello,

I am an experienced programmer but a beginner to python.  As such, I can figure out a way to code most algorithms using more "C" style syntax.

I am doing something now that I am sure is a more python way but i can't quite get it right.  I was hoping someone might help.

So I have a list of grid coordinates (x, y).  From that list, I want to create a new list that for each coordinate, I add the coordinate just above and just below (x,y+1) and (x,y-1)

right now I am using a for loop to go through all the coordinates and then separate append statements to add the top and bottom.

is there a way to do something like: [(x,y-1), (x,y+1) for zzz in coord_list] or something along those lines?

thanks!

Embedding Python27 in C++ on Windows: CRT compatibility issues withVS2010?

Stephen Lin — 2012-05-24T16:10:46

Hello,

I'm a relative python newbie but I've been tasked to figure out how to
embed calls to a python library in an Excel XLL add-in.

The Python/C API for doing this seems pretty straightforward, but I
seem to have read somewhere online that it's important that the C++
program or DLL linking to and embedding Python must be using the same
CRT as what the Python implementation dll is using. Is this true, or
is the Python API written in such a way that there is no dependency on
a common CRT?

If there is a dependency, does that mean that I cannot use VS2010 to
develop this XLL, but should use VS2008 instead, or are there other
workarounds?

Thanks for the help,
Stephen

Czy dysponujesz dwoma wolnymi godzinami w tygodniu? Oto jak zarobc185 EUR w tym czasie.

2012-05-24T15:53:09

Dzien dobry!

Dziekujemy bardzo za zainteresowanie pozycja regionalnego przedstawiciela dostepna obecnie w Polsce i krajach Europy Srodkowej.

Chcialem by przedstawic, bardzo krotko - nasza wybitna firme.
W.U.G. Inc zostala zalozona w 1992 roku i obecnie stala sie jedna z najbardziej uznawanych firm biznesowych, ktore zapewniaja kompleksowa obsluge swoim klientom.
Siec przedstawicielstw West Union Group jest reprezentowana w ponad 32 krajach i swiadczy uslugi do 46 krajow.
Specjalizujemy sie w doradztwie w zakresie planowania podatkowego, rejestracji firm, nadajac rowniez dodatkowe finansowe uslugi wsparcia dla firm zagranicznych.
WUG jest dobrze znana w USA, Kanadzie i niektorych panstwach Unii Europejskiej.

Nasza firma nie moze pozwolic na stworzenie regionalnego biura w kazdym kraju z powodu wysokich kosztow operacyjnych, z tego powodu pragniemy wynajac przedstawiciela regionalnego wypelniac powierzone mu zadania.
Wiekszosc naszych operacji z klientami sa przeprowadzane w Internecie.

Kiedy klient jest gotowy oplacic za korzystanie z naszych uslug, regionalny przedstawiciel bedzie musial pomoc mu / jej przetworzyc platnosci i upewnic sie, ze fundusze zostaly otrzymane w naleznym czasie.

Regionalny Przedstawiciel bedzie odpowiedzialny za pomoc naszym klientom z niektorymi ugodami i przetwarzanie przelewow.

Gwarantujemy wynagrodzenie w wysokosci 2500 EUR miesiecznie wyplacane co dwa tygodnie.

Nalezy pamietac, ze duza czesc zadan zostanie przedstawiona w ciagu dziennego czasu.
Zwroccie uwage, ze proponujemu pozycje o niepelnym wymiarze godzin, wiec trzeba bedzie wydac tylko 2-3 godzin dziennie na tej prace.

WUG Inc zabezpieczy nowego pretendenta w calosci oplacalnym dwutygodniowym treningowym okresem.
Otrzymaja Panstwo wszystkie niezbedne informacje na temat szkolen od naszego specjalisty po zatrudnieniu.

Jesli znajdujecie to interesujacym, zyczliwie prosimy was podac nam wasze dane kontaktowe (naprzyklad numer telefonu, imie i nazwisko), abysmy mogli skontaktowac sie z wami dla dalszej komunikacji.
Prosimy nie wahajcie sie z nami skontaktowac w kazdej chwili, jesli macie jakiekolwiek dodatkowe pytania dotyczace tej pozycji.

Nasz e-mail: Maksymilian< at >toppolandjobs.com,Najcieplej pozdrawiamy,

Maksymilian Skrzypinski
Menadzer personelu
WUG Inc

Dynamic comparison operators

2012-05-24T14:14:18

I would like to pass something like this into a function
test(val1,val2,'>=')

and it should come back with True or False.

Is there a way to dynamically compare 2 values like this or will I have to code each operator individually?

Email Id Verification

niks — 2012-05-24T12:32:16

Hello everyone..
I am new to asp.net...
I want to use Regular Expression validator in Email id verification..
Can anyone tell me how to use this and what is the meaning of
this
\w+([-+.']\w+)*< at >\w+([-.]\w+)*\.\w+([-.]\w+)*

other languages API to python

Rita — 2012-05-24T11:58:49

Hello,

A vendor provided a C, C++ and Java API for a application. They dont
support python so I would like to create a library for it. My question is,
how hard/easy would it be to create something like this? Is there a simple
HOWTO or examples I can follow? Can someone shed home light on this?

TIA

Namespace hack

Steven D'Aprano — 2012-05-24T08:50:59

Namespaces are one honking great idea -- let's do more of those!


Inspired by this, I have a decorator that abuses function closures to 
create a namespace type with the following properties:

- all methods are static methods that do not take a "self" parameter;

- methods can see "class variables";

- external callers can see selected methods and attributes.


An example may make this clearer.

In a regular class:

class C:
    x = 42
    def spam(self, y):
        return self.x + y
    def ham(self, z):
        return self.spam(z+1)


Notice that the class attribute x is visible to the outside caller, but 
methods spam and ham cannot see it except by prefixing it with a 
reference to "self".

Here's an example using my namespace hack example:

< at >namespace
def C():  # Abuse nested functions to make this work.
    x = 42
    def spam(y):
        return x + y
    def ham(z):
        return spam(z+1)
    return (spam, ham)  # Need an explicit return to make methods visible.

However, class attribute x is not exposed. You may consider this a 
feature, rather than a bug. To expose a class attribute, define it in the 
outer function argument list:

< at >namespace
def C(x=42):
    def spam(y):
        return x + y
    def ham(z):
        return spam(z+1)
    return (spam, ham)



And in use:

42
142
1042



Here's the namespace decorator:

import inspect

def namespace(func):
spec = inspect.getargspec(func)
ns = {'__doc__': func.__doc__}
for name, value in zip(spec.args, spec.defaults or ()):
ns[name] = value
function = type(lambda: None)
exported = func() or ()
try:
len(exported)
except TypeError:
exported = (exported,)
for obj in exported:
if isinstance(obj, function):
ns[obj.__name__] = staticmethod(obj)
else:
raise TypeError('bad export')
Namespace = type(func.__name__, (), ns)
return Namespace()


Have fun!

Working with dates : complex problem

Thibaut DIRLIK — 2012-05-24T07:31:40

Hi,

I've a list of python objects with dates attributes. This list is ordered
by one of these date. Elements mandatory follow each other :

Element #1                   Element #2           Element #3
|-------------------------|--------------|--------------------------|

Now, I want to "insert" an element in this timeline. This imply that I will
have to resize some elements :

Element #1                   Element #2           Element #3
|-------------------------|--------------|--------------------------|
                New element
          |----------------------|

And after resize :

Element #1      New element       Element #2       Element #3
|---------|----------------------|---------|--------------------------|

          |----------------------|

My question is the following : how can I know (easily) which elements my
"New element" is "over", which,
in my example would have returned ['Element #1', 'Element #2'].

Elements objets are simple Python objects with dates :

obj.begin = datetime()
obj.end = datetime()

I'm looking for the more Pythonic way to handle this problem, thanks !

PyDev IPython Confusion

Wanderer — 2012-05-23T20:06:40

I have two versions of Python and Ipython; Python 2.6.6 with Ipython
0.11 and Python 2.7.3 with Ipython 0.12.  When I run the Eclipse PyDev
console for the Python 2.7.3 it says it is using Ipython 0.11 as the
interpreter. Ipython 0.11 should not be in the Path for Python 2.7.3.
Is this a bug in Ipython 0.12? Is there a command to check the Ipython
version to verify it is Ipython 0.11 and not Ipython 0.12? Could this
be something in the Windows registry that Ipython 0.11 is the
'registered' version of Ipython?

Thanks

Applying a patch from a diff in python (if possible)

Astan — 2012-05-24T03:24:10

Hi,
I'm trying to synch up two databases that are very far from each other
using diff and patch. Currently, what happens is a mysqldump on
database A (which is linux) which is sent over to database B and over
time the diff of this mysql is sent over to database B. The database B
lives on a NAS server without any linux machines available (all of
them are windows 7s) to apply the patch to the diff. I've been looking
into the python diff modules and it seems that most can't deal with
files (these .diff files are large and binary since the data in the
database is all sorts of binary). Also I've had a look at the
patch.exe program for windows which also complains about the file
being binary (or something. i've tried all sorts of flags and they
don't seem to work). Are there any patch modules out there that I'm
missing? The diff_patch_match module doesn't seem to like the diffs
with angle brackets
Thanks for any help

Korean fonts on Python 2.6 (MacOsX)

20_feet_tall — 2012-05-23T09:30:20

I have a problem with the visualization of korean fonts on Python.
When I try to type in the characters only squares come out.
I have tried to install the CJK codec, the hangul 1.0 codec but still
no result.
Hoep someone can help me out.