need help of regular expression genius

[GHUM]

I need to split a text at every ; (Semikolon), but not at semikolons
which are "escaped" within a pair of $$ or $_$ signs.

My guess was that something along this should happen withing csv.py;
but ... it is done within _csv.c :(

Example: the SQL text should be splitted at "" (of course,
those "split heres" are not there yet :)

set interval 2;

CREATE FUNCTION uoibcachebetrkd(bigint, text, text, text, text, text,
timestamp without time zone, text, text) RETURNS integer
AS $_$
DECLARE
result int4;
BEGIN
update bcachebetrkd set
name=$2, wieoftjds=$3, letztejds=$4, njds=$5,
konzern=$6, letztespeicherung=$7, betreuera=$8, jdsueberkonzern=$9
where id_p=$1;
IF FOUND THEN
result:=-1;
else
   insert into bcachebetrkd (
   id_p, name, wieoftjds, letztejds, njds, konzern,
letztespeicherung, betreuera, jdsueberkonzern
   )
values ($1, $2, $3, $4, $5, $6, $7, $8, $9);
result:=$1;
END IF;
RETURN result;
END;
$_$
LANGUAGE plpgsql;

CREATE FUNCTION set_quarant(mylvlquarant integer) RETURNS integer
AS $$
BEGIN
perform relname from pg_class
where relname = 'quara_tmp'
  and case when has_schema_privilege(relnamespace, 'USAGE')
then pg_table_is_visible(oid) else false end;
if not found then
create temporary table quara_tmp (
lvlquara integer
);
else
   delete from quara_tmp;
end if;

insert into quara_tmp values (mylvlquarant);
  return 0;
  END;
 $$
LANGUAGE plpgsql;


Can anybody hint me in the right direction, how a RE looks for "all ;
but not those ; within $$" ?

Harald

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Re: need help of regular expression genius

[GHUM]

Paul,

> text = """ ... input source text ... ""
> from pyparsing import SkipTo,Literal,replaceWith
> ign1 = "$$" + SkipTo("$$") + "$$"
> ign2 = "$_$" + SkipTo("$_$") + "$_$"
> semi = Literal(";").setParseAction( replaceWith("; <***>") )
> print (ign1 | ign2 | semi).transformString(text)

Thank you very much! this really looks beautifull and short! How could
I forget about pyparsing? Old loves are often better then adventures
with RE. :)

Two questions remain:
1) I did not succeed in finding a documentation for pyparsing. Is there
something like a "full list of Classes and their methods" ?

2) as of missing 1) :)): something like
"setParseAction(splithereandreturnalistofelementssplittedhere) ?

 Thanks again!

Harald

(of course, I can .split("<***>") the transformedString :)

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Re: need help of regular expression genius

[GHUM]

Paul,

> Pyparsing ships with JPG and PNG files containing class diagrams, plus an
> htmldoc directory containing epydoc-generated help files.
> There are also about 20 example programs included (also accessible in the
> wiki).

Yes. That's what I have been missing. Maybe you could add: "please also
download the .zip file if you use the windows installer to find the
documentation" :)))

>You could also look into using scanString instead of transformString
thats what I found:
from pyparsing import SkipTo,Literal,replaceWith
ign1 = "$$" + SkipTo("$$") + "$$"
ign2 = "$_$" + SkipTo("$_$") + "$_$"
semi = Literal(";")

von=0
befehle=[]
for row in (ign1 | ign2 | semi).scanString(txt):
if row[0][0]==";":
token, bis, von2=row
befehle.append(txt[von: von2])
von=von2

I knew that for this common kind of problem there MUST be better
solution then my homebrewn tokenizer (skimming through text char by
char and remembering the switch to escape mode ... brr, looked like
perl)

Thanks for the reminder of pyparsing, maybe I should put in a reminder
in my calender ... something along the lines "if you think of using a
RE, you propably have forgotton pyparsing" every 3 months :)

Best wishes and thank you very much for pyparsing and the hint

Harald

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need hint for refactoring

[GHUM]

I have a bunch of function like:

def p2neufrage(_):
""" create new element"""
anfrage,ergebnis=getanfrage()
if ergebnis.get("status","ok") == "ok":
wert=anfrage["feld"]
# do something
# unique here


ergebnis["innerHTML"]=. something 

#
return simplejson.dumps(ergebnis, skipkeys=False,
ensure_ascii=False, check_circular=True, allow_nan=True)


so, everywhere there is the same beginning:

anfrage,ergebnis=getanfrage()

I analyze some transmitted jason-document; check for errors

then I take the values out of the request, process it and fill the
slots of a result ("ergebnis") dictionary, which is returned.


So the beginning and the end of the function is allways repeated. It
would be great to factor it out ... i startet with that ...getanfrage()
call. 

Is there anything more possible?

Thanks for any hint

Harald

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win32 load icon not from file, but from

[GHUM]

I have found a "make a icon in traybar" skript, and it loads its Icon
from a file

hinst =  win32gui.GetModuleHandle(None)
iconPathName= "c:/myapp/myapp.ico"
icon_flags = win32con.LR_LOADFROMFILE | win32con.LR_DEFAULTSIZE
hicon = win32gui.LoadImage(hinst, str(iconPathName),
win32con.IMAGE_ICON, 0, 0, icon_flags)

that works great.

But now I have to distribute that icon together with the application -
that is one file more to take track. I would like to load this image
from 
with something being a string / a cStringIO / something pickled

The obvious

cPickle.dumps(hicon) leads to nothing, cause it only gets the ID of the
hicon :(

Any ideas / recommendations / tipps?

Harald

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Re: Compiling wxPython app for Windows; Single EXE

[GHUM]

Daniel,

I am using py2exe since more then 4 years, so I am rather biased.

I read PyInstaller page and was positively impressed by the manual and
all the good words.
There is one major difference which will keep me with py2exe:

with PyInstaller and single file there is:
"When first started, it finds that it needs to extract these files
before it can run "for real"."

and with py2exe:
Changes in 0.6.1:

* py2exe can now bundle binary extensions and dlls into the
  library-archive or the executable itself.  This allows to
  finally build real single-file executables.

  The bundled dlls and pyds are loaded at runtime by some special
  code that emulates the Windows LoadLibrary function - they are
  never unpacked to the file system.

this "they are never unpacked to the file system" is the USP of py2exe
to me at the moment.

What is less then optimal with both packages, is that MSVCR71.DLL needs
to be distributed separately :(

Harald

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Re: Python and STL efficiency

[GHUM]

Mc Osten schrieb:

> Yes it is. But of course you can't sat that "Python is faster than C++".

Of course not. Python is faster then assembler. Proofed @ EuroPython
2006 in CERN, near the LHC Beta, in the same room many Nobel laurates
gave their presentations before.

Harald

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codecs - where are those on windows?

[GHUM]

I stumbled apon a paragraph in python-dev about "reducing the size of
Python" for an embedded device:

"""
In my experience, the biggest gain can be obtained by dropping the
rarely-used
CJK codecs (for Asian languages). That should sum up to almost 800K
(uncompressed), IIRC.
"""

So, my question is: on Windows. where are those CJK codecs? Are they by
any chance included in the 1.867.776 bytes of python24.dll ?

Best wishes,

Harald

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Re: codecs - where are those on windows?

[GHUM]

Fredrik Lundh schrieb:

> > If your installation directory is C:\Python25, then look in
> > C:\Python25\lib\encodings
>
> that's only the glue code.  the actual data sets are provided by a bunch
> of built-in modules:
>  >>> import sys
>  >>> sys.builtin_module_names
> ('__builtin__', '__main__', '_ast', '_bisect', '_codecs',
> '_codecs_cn', '_codecs_hk', '_codecs_iso2022', '_codecs_jp',
> '_codecs_kr', '_codecs_tw', ...

So, it should be possible to do a custom build of python24.dll /
python25.dll without some of those codecs, resulting in a smaller
python24.dll ?

It will be some time untill my apps must support Chinese and
Japanese...

Harald

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Re: Exploiting Dual Core's with Py_NewInterpreter's separated GIL ?

[GHUM]

robert,

> Interprocess communication is tedious and out of questio
[...]
> I expect to be able to directly push around Python Object-Trees between the 2 
> (or more) interpreters by doing some careful locking.

Please do yourself a favour and have a look at pyro. pyro makes
InterComputer and InterProcess Communication a snap. And it allows you
to push around Python Objects not only between processes, but
computers.

Maybe it solves your problem much easier and even more than you want to
solve it now by being able to use more then one computer.

Harald

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propose extension of mimetypes

[GHUM]

Hello,


mimetypes lacks the guessing of .svg as image/svg+xml

mimetypes.add_type("image/svg+xml",".svg", True)

maybe this can be added to python 2.5 standard library


Harald

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Last Call - proposals for talks in the business and application track at EP 2006

[GHUM]

In 2006, EuroPython will be from the 3rd to the 5th of July at CERN,
near Geneva in Switzerland.

In business & applications we want to hear about how you made your
fortune with Python. Show us YOUR interesting released Python
applications. Describe your fabulous business models with Open Source
Software. Report about your pub cashier solution in Python and how you
solved the challenges of longer opening hours. Narrate the background
stories about your next generation search engine which has just gone
live.

Explain us the technique, tell us the story, paint your business model!
Show us how YOU got affluent, opulent, pecunious, proliferative,
prosperous and wealthy - all using Python!

Do you use Python to make big business in the lumber sawing or porn
industrie? Let us know how!

Move up to
http://www.europython.org/sections/tracks_and_talks/announcements/call-for-proposals

and submit your proposal. DEADLINE is 2006-05-31 - so do not hesitate
any further!



All who still need to know how to get rich and improve their love life
using Python:
you are heartly invited to register for EuroPython 2006 via the website
http://www.europython.org

The "normal fee" is 190€ for three days of seminars and a fine
conference dinner.

In addition to our great conference, you have the possibility to visit
CERN! Maybe you read about it in Angel & Demons ("Illuminati" in
German)
from Dan Brown; maybe you know that Sir Tim Berners-Lee invented the
World Wide Web there.

You will have the chance to eat in canteens with the highest
probability
anywhere in the world to stand in queue with a future or past Nobel
Prize Winner. You can learn about the technologies that will power Web
2.5 and above at the place where Web 0.1 up to Web 1.0 were developed.

CERN says about itself:  "The world's largest particle physics
laboratory ... where the web was born!". As a German you are
culturally obligued to go the place where they try to find out "was
die Welt / in ihrem innersten zusammenhält". (So that I may perceive
whatever holds / The world together in its inmost folds (Faust I)) -
learn about that place at www.cern.ch


Harald Armin Massa
persuadere et programmare

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Re: programming with Python 3000 in mind

[GHUM]

Steven,

you ask good questions!

> (2) Will there be automated tools for converting source code from Python 2
> to Python 3000?

If you would have been to the EuroPythom 2006, you may have heard the
plans for PyPy 2.0; which may have per-module-switchable syntax
compatibility for Py 2.2-3000. So by trusting the PyPy team, you can
stay very very relaxed concerning Python 3000.

Harald

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accessing the DHCP Server Management API

[GHUM]

Hello,

I need to get a list of active leases on a windows dhcp server.

Experts from Microsoft statet:


A: Go to the Address leases of each scope in the DHCP snap-in and dump
the leases to a text file from the DHCP server snap-in. The text file
gives you all the information for every active lease. You might also
want to query the DHCP server management API:
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dhcp/dhcp/dhcpenumsubnetclients.asp.


(http://www.microsoft.com/technet/community/chats/trans/windowsnet/wnet_05_0303.mspx)

Option A is not really an option for programmatic access :)

So my question: Has anyone accessed the DHCP Server Management API from
Python before? I googled my browser smoking with hopes that that API
might be accessible via WMI, but to no avail for me.

Any recommendation how to access this information via Python? pyDHCPSMA
anyone?

Harald

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Re: PostgreSQL, psycopg2 and OID-less tables

[GHUM]

Dale,

> Now that OIDs have been deprecated in PostgreSQL, how do you find the key of
> a newly inserted record?

using OIDs as primary key was no good idea for some PostgreSQL versions
allready ... i.e. they really make dump & restore much more
challenging.

So usually us have something along:

CREATE TABLE feuser
(
  id_user serial NOT NULL,
  name text,
  CONSTRAINT feuser_pkey PRIMARY KEY (id_user),
  CONSTRAINT feuser_name_key UNIQUE (name)
)
WITHOUT OIDS;

which automatically creates a sequence for you and rewrites the serial
"id_user" with a default of

nextval('feuser_id_user_seq'::regclass)

So, to get the key of a record inserted, basically there are two
methods. (from now on "cs" is a DB-API 2.0 compliant cursor object,
i.e. from psycopg2

cn=psycopg2.connect()
cs=cn.cursor()

a) get id first, then insert
cs.execute("select nextval('feuser_id_user_seq'::regclass)")
newid=cs.fetchone()[0]

cs.execute("insert into feuser (id_user, name) values (%(id_user)s,
%(name)s)",
 dict(id_user=newid, name="Karl Napf")

cs.commit()
-> now newid contains your new id.

b) create a serverside function on PostgreSQL:
CREATE OR REPLACE FUNCTION insfeuser (text)
  RETURNS integer AS
$BODY$
DECLARE
result int4;
BEGIN

   select nextval('feuser_id_user_seq'::regclass) into result;
   insert into feuser (id_user, name) values (result, $1);

 RETURN result;
END;

$BODY$
  LANGUAGE 'plpgsql' VOLATILE;

within python:
cs.execute("select insfeuser(%(name)s)",  dict(name="Karl Napf"))
newid=cs.fetchone()[0]

Hope that helps,

Harald

--
GHUM Harald Massa
persuadere et programmare
Harald Armin Massa
Reinsburgstraße 202b
70197 Stuttgart
0173/9409607

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Re: Python programs always open source?

[GHUM]

Guy Fawkes schrieb:

> I don't want my program to
> be open-source and so far all the Python programs I've seen included the
> source code.

That's one of the great freedoms of Python and its licence: You are
free to chose the licence for your product. No GPLish "you must be as
free as we", more BSDish: "Do what you want, do not come crying"

> Is it possible to make an executable with only bytecode?
I use py2exe with its "new" (~1 year) single file feature with great
success. I even succeeded in including a virtual static directory for a
webserver within that file.

To be exact, it is not really 1 file, but 2, as you often have to
distribute msvcr71.dll with it  - except for those computers having
i.e. MS Office 11 installed, there it is allready present.

Combining py2exe's single file distributable and upx compression I
achieve fairly compact "just drop and use" applications without a real
need for installation. I do not care about people decompiling
(customers get the source code on request, if they are interested).
It would be possible - but those who have the time and knowledge to
dissect and decompile those upxed py2exed files and still make a profit
would probably not see a reason to buy my software anyway :)

Harald

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PIL 2.5 win32 binaries?

[GHUM]

On the PIL website I read:

The current free version is PIL 1.1.5, which has been tested with
Python 1.5.2 and newer, including 2.3 and 2.5.

but in downloads I cannot see any binaries for windows and Python 2.5

Are they somewhere available?

Best wishes,

Harald

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Re: When is it a pointer (aka reference) - when is it a copy?

[GHUM]

Magnus Lycka schrieb:
> > http://effbot.org/zone/python-objects.htm
> > may be useful for those who haven't already seen it.
>
>Shouldn't it be incorporated into the standard tutorial?
>I think it's very helpful for people who are used
> to the way C etc handles variables.

That would also be a good headline. "information for those coming from
C", and it should be possible to grow similiar sections for those
comming from Java or PERL.

At least it belongs into the FAQ :)

Harald

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Re: Talking to marketing people about Python

[GHUM]

Roy Smith schrieb:
>
> Can anybody suggest some good material I can give to him which will help
> explain what Python is and why it's a good thing, in a way that a
> marketing/product management person will understand?

please also look for the "Python success stories"

There is also a aviation control system running with Python / using
Python bindings.

Google offers Python bindings and has employed the BDFL and at least
one ~bot. I think nobody would doubt that Google has the most knowledge
about online services - maybe there is something about Python?

You can also point out that Python is especially suited for secure
online applications, with more web frameworks than keywords it offers a
very high "security through diversity", as no single vulnerabilitie can
be exploited across a big enough ecosphere.

Harald

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Re: does anybody earn a living programming in python?

[GHUM]

walterbyrd,

Answer: Yes. Definitely. And, to be correct, there are some who earn a
rather comfortable living programming in Python.

> If so, I doubt there are many.

depending on your definition of "many". if "many" is something around
"1% of population of earth", you are right.

If "many" is "more than 1000", than you are wrong.

I formyself earn the major part of my income doing Python - combined
with database knowledge, of course.


> I wonder why that is?
There seems to be a challenge to have more people programm Python: to
hire people with Python knowledge. Maybe the recruiters of Google can
enlighten you on the prospects of Python programmers on the market :)

Java is educated in a kind of vocational training in universities; but
at the moment only the elite gets in touch with Python.

Harald

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Re: Best way to handle large lists?

[GHUM]

> > Maybe the application should use sets instead of lists for these
> > collections.
> What would sets do for me over lists?

searching for an element in a list is O(n)
searching for an element in a set is O(1)   (for reasonable distributed
elements)

Harald

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Re: python html rendering

[GHUM]

Pierre,

> Hi, Im looking for a way to display some python code
> in html: with correct indentation, possibly syntax hiliting, dealing
> correctly with multi-line comment,


the usual way is to create your own web-framework


If it is just "some" Python code and you have to do it "once", just
look at scite. Scite can colour your code, and you can export it as
HTML.

Harald

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how to get all the "variables" of a string formating?

[GHUM]

imagine:


template=""" Hello %(name)s, how are you %(action)s"""


we can use it to do things like:

print template % dict (name="Guido", action="indenting")


Is there an easy (i.e.: no regex) way to do get the names of all
parameters?

get_parameters(template) should return ["name", "action"]


Python has to do this somewhere internally. how to access this
knowledge?

Harald

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Re: Roundtrip SQL data especially datetime

[GHUM]

> One side effect of this being third party code is that hosting
> services may not have it available, even when they have both Python
> and MySQL up.  This is never a problem with Perl or PHP, so that's
> a negative for Python.

I for one think it is a good thing to not have MySQL adapters
integrated into Python core. Neither the philopsophie, nor the licence
of the two products fit together.

But maybe that's because I am a PostgreSQL zealot - and PostgreSQL and
Python is really a match made in heaven.

Harald

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sheeps be carefull of Python

[GHUM]

sometimes Python is more dangerous than documented:

http://news.nationalgeographic.com/news/2006/09/060915-python-ewe.html


Harald

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EuroPython: Draft program posted, today last day of early registration

[GHUM]

Dear Pythonistas!

On www.euroypython.org the draft program and timetable has been
posted!

http://www.europython.org/sections/tracks_and_talks/draft-timetable

Do a click and check out the fabulous talks. Then check in, best
today, the 8th of June, the last day of early bird registration.

EuroPython 2007 will take place at the Reval Hotel Lietuva in Vilnius,
Lithuania from Monday 9th July to Wednesday 11th July. See you there!

Best wishes,

Harald

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Re: import data.py using massive amounts of memory

[GHUM]

> Note that once it has made the .pyc file the subsequent runs take even
> less memory than the cpickle import.

Could that be the compiler compiling?

Without knowing to much details about that process, but from 2.4 to
2.5 the compiler was totally exchanged,  to AST.
That would explain the drop from 8Meg -> 2.2 Meg.

Harald



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Re: While we're talking about annoyances

[GHUM]

Steven,

> def index(sequence):
> decorated = zip(sequence, xrange(len(sequence)))
> decorated.sort()
> return [idx for (value, idx) in decorated]

would'nt that be equivalent code?

def index(sequence):
return [c for _,c  in sorted((b,a) for a, b in
enumerate(sequence))]

tested, gave same results. But worsens your doc2code ratio :)

Harald Armin Massa
--

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EUROPYTHON: Talk submission deadline extended up to Friday, 25th of May

[GHUM]

We took longer then planned to open the registration.

Some potential speakers came in late.

To make it even, we extended talk submission deadline for ONE WEEK.

New deadline is Friday, 25th of May 2007.


So, if you made a fortune with Python: tell others about it at
EuroPython.
If you have a great distributed revision control system, which has
been stable on 9.3 for months,
submit a talk to EuroPython and announce 1.0 there!
If you have a fantastic new keyword, graphic library or web framework
for Python: submit your talk to EuroPython.
If you are doing something interesting with Python - grab the chance
to visit Lithuania and tell Europe about it.

And if you do not wanna give a talk: block 9-11 July 2007 in your
calendar,
adjust your budget, tell your customers that you will be in Vilnius.

Again:
Talk submission deadline of EuroPython 2007 extended to Friday,
25th of May 2007
Submit your talk @ www.europython.org


For the EuroPython 2007 organizers


Harald Armin Massa

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Re: Questions about app design - OOP with python classes

[GHUM]

>
> if hmmCurrentHeight <= hinCriticalHeight:
> then you should instantly recognise that there's a problem.

all civilized nations but one use metric systems. Of course there is a
problem if you spot inches somewhere.

Harald



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Re: cx_Oracle and unicode data

[GHUM]

loo ping,

> But it's not what I call a 'clean' solution and I suppose that it must
> exist another way to force the client DB to use UTF8, or another
> solution to get my data.

I share your feeling. I asked a similiar question ~1 year ago; and:
your solution is the only one.

The oracle-libs get their encoding from the environment. I also
learned that it often is helpfull to first set the environment and
THEN import cx_Oracle (which loads the oci.dll)

> import os
> os.environ["NLS_LANG"] = ".UTF8"
> import cx_Oracle
>

> cur.execute("select DESCRIPTION from DEC_DESCRIPTION where
> DEC_DESCRIPTION_ID = 1792528")

Additionally: UTF8 has different numbers of bytes per character. Your
select will only succeed for the time that DESCRIPTION encoded in UTF8
is shorter or equal to length(DESCRIPTION)

I got into the habbit to cast those fields to
NVARCHAR2(as big as I think it may get)

Harald

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Re: Yet another comparison of Python Web Frameworks

[GHUM]

Michele,

> At work we are shopping for a Web framework, so I have been looking at
> the available options on the current market.

just because you were involved in creating an own version of Python
does NOT free you from the social obligation to create your own Python
web framework. So stop shopping and start announcing your own pwf like
all other Python programmers do.

Harald

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Re: win32com.client

[GHUM]

rzed,

> 1) In your browser, enter this URL:http://sourceforge.net/projects/pywin32/
>
[...]
> Try those steps, then try importing win32com again.

man, you are SO 2005. Could'nt you please make a screen cap video,
upload it to youtube and give a pointer to it on your blog?
*wink*

Harald


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Re: win32com.client

[GHUM]

btw... the statement with "youtube" was a joke.

I really applaud rzed you for giving this detailed descriptions,
people like him make the spirit of c.l.p.: People get help here WAY
over what commercial support usually gets you.

Thanks for doing that, rzed!

best wishes,

HArald

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Re: New Pythin user looking foe some good examples to study

[GHUM]

Johnny,

look no further than your harddrive.

The Python Standard Lib is full of code examples of Python programming
for various uses.

Just find where your packagemanager has installed them; within windows
it is usually

python24/lib
or
python25/lib

I suspect them to be below usr/lib on linux.

best wishes,

Harald


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Re: OPLC purchase period extended

[GHUM]

> >  [http://laptopgiving.org/en/terms-and-conditions.php]
>
> I'm sure that some people would be willing to serve as middleware...

So, which US-Pythoneer is willing to serve as middleware for my buying
of the XO?

Please contact me.

Harald

--
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persuadere et programmare
Harald Armin Massa
Spielberger Straße 49
70435 Stuttgart
0173/9409607
fx 01212-5-13695179
-
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create pywintypes.CreateGuid() compatible guids on Linux ?

[GHUM]

Hello,

I created lots of guids via  pywintypes.CreateGuid()  on windows.

Now I would like to run the same software on Linux / Solaris /
FreeBSD.

So I should produce "compatible" GUIDS on that systems. "compatible"
having the meaining: "Providing similiar likelehood of collisions".

of course "google python guid" leads directly to
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/163604,
but ... will it blend?

any ideas what could help me to research?

Harald
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Re: Intranet Project - Rad Or Waterfall

[GHUM]

> Option 1 - Waterfall

I recommend to google "waterfall". First hit after those beatifull
pictures will be:

http://en.wikipedia.org/wiki/Waterfall_model

Within the first paragraph there is:

   """Ironically, Royce was actually presenting this model as an
example of a flawed, non-working model.(Royce 1970)"""


So I cannot fight the feeling of seeing the realisation of a xkcd-
strip when reading about waterfall models...

Harald
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building psycopg2 on windows using mingw, "cannot find -lpq"

[GHUM]

The compile works, BUT linking fails:

2.5\Release\psycopg\_psycopg.def -Lc:\python25\libs -Lc:
\python25\PCBuild -Lc:/p
ostgres/83RC2/lib -lpython25 -lpq -lws2_32 -ladvapi32 -o build
\lib.win32-2.5\psy
copg2\_psycopg.pyd
c:\mingw\bin\..\lib\gcc\mingw32\3.4.5\..\..\..\..\mingw32\bin\ld.exe:
cannot find -lpq
collect2: ld returned 1 exit status
error: command 'gcc' failed with exit status 1

if I google for the error

"ld.exe: cannot find -lpq"

there is allways the information that the lib-dir of libpq is missing;
but :

 -Lc:/postgres/83RC2/lib

is clearly in the commandline, and within c:/postgres/83RC2/lib
there is one libqp.lib

What am I missing? any hints?

Best wishes,

Harald

(complete output:
c:\mingw\bin\gcc.exe -mno-cygwin -shared -s build
\temp.win32-2.5\Release\psycopg
\psycopgmodule.o build\temp.win32-2.5\Release\psycopg\pqpath.o build
\temp.win32-
2.5\Release\psycopg\typecast.o build\temp.win32-2.5\Release\psycopg
\microprotoco
ls.o build\temp.win32-2.5\Release\psycopg\microprotocols_proto.o build
\temp.win3
2-2.5\Release\psycopg\connection_type.o build\temp.win32-2.5\Release
\psycopg\con
nection_int.o build\temp.win32-2.5\Release\psycopg\cursor_type.o build
\temp.win3
2-2.5\Release\psycopg\cursor_int.o build\temp.win32-2.5\Release\psycopg
\lobject_
type.o build\temp.win32-2.5\Release\psycopg\lobject_int.o build
\temp.win32-2.5\R
elease\psycopg\adapter_qstring.o build\temp.win32-2.5\Release\psycopg
\adapter_pb
oolean.o build\temp.win32-2.5\Release\psycopg\adapter_binary.o build
\temp.win32-
2.5\Release\psycopg\adapter_asis.o build\temp.win32-2.5\Release\psycopg
\adapter_
list.o build\temp.win32-2.5\Release\psycopg\adapter_datetime.o build
\temp.win32-
2.5\Release\psycopg\_psycopg.def -Lc:\python25\libs -Lc:
\python25\PCBuild -Lc:/p
ostgres/83RC2/lib -lpython25 -lpq -lws2_32 -ladvapi32 -o build
\lib.win32-2.5\psy
copg2\_psycopg.pyd
c:\mingw\bin\..\lib\gcc\mingw32\3.4.5\..\..\..\..\mingw32\bin\ld.exe:
cannot find -lpq
collect2: ld returned 1 exit status
error: command 'gcc' failed with exit status 1
)
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Re: building psycopg2 on windows using mingw, "cannot find -lpq"

[GHUM]

> > The compile works, BUT linking fails:
>
> > 2.5\Release\psycopg\_psycopg.def -Lc:\python25\libs -Lc:
> > \python25\PCBuild -Lc:/p
> > ostgres/83RC2/lib -lpython25 -lpq -lws2_32 -ladvapi32 -o build
>
> >  -Lc:/postgres/83RC2/lib
>
> Are you sure using forward slashes in the path works here?

Not at all. But that commandline is generated by setup.py, not by me :
(
and setup.py extracts the paths from pg_config

so: I have no idea how to make it use backslash :(

Thanks for the idea,

Harald
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Re: building psycopg2 on windows using mingw, "cannot find -lpq"

[GHUM]

> I use psycopg2 all the time on windows. I use the binary installer
> instead of source. Works great for me.
>
> -Tom
Me2. Just in 7 out of 200 it does not work with the currently
available binary installer, on some startups, so I decided to follow a
recommendation out of the psycopg2 list to compile it from trunk :(

Harald
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Re: translating Python to Assembler...sorry if this is duplicated...it's unintentional

[GHUM]

> My expertise, if any, is in assembler. I'm trying to understand Python
> scripts and modules by examining them after they have been
> disassembled in a Windows environment.

Maybe you could also profit from diassembling Pythons bytecode into
MNEmonics of the Python Virtual Machine ?

http://docs.python.org/lib/module-dis.html

Because "disassembling python scripts" with any other disassembler
will not likely lead to something usefull:

 a) the .pyc and pyo files are in Python Bytecode, that is "assembler
for the Python Virtual Machine Processor", disassemble with the
mentioned module

 b) python2x.dll is in i386-Assembler, but contains the virtual
machine. Understanding that will you will learn a lot of great
programming concepts from some of the most brilliant minds on this
planet; but will give you no hint to understand Python scripts, as
they are running on top of that VM. Like disassembling the Hybrid
Power Drive of a Lexus GS450h will teach you nothing about navigating
from Berlin to Paris.

Best wishes,

Harald
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Re: Py2exe and Multi Treading problem.

[GHUM]

Farsheed Ashouri ,

> Here is my script
> #**
> #**
> import threading
> import socket
> def openSocket(portNum):
> mySocket = socket.socket ( socket.AF_INET, socket.SOCK_STREAM )
> mySocket.bind ( ( '', portNum ) )
> mySocket.listen ( 1 )
> channel, details = mySocket.accept()
> msg = channel.recv(4096)
>
> class CmdPortThread( threading.Thread ):
> def run( self ):
> openSocket(6000)
>
> def fakeCommandPort():
> CmdPortThread().start()
> fakeCommandPort()

> If works perfect with python 2.5.2. Now I want to convert it to
> standalone program.
> but the .exe file fails to run without any error.

are you sure that it fails to run? I expect it to run, and exit
immediately after fakeCommandPort(). That is: there is nothing more to
do in the main thread, so the application exits.

To learn more, add prints and use the usual if __name__=='__main__'

class CmdPortThread( threading.Thread ):
 def run( self ):
 print "Thread CmdPortThread running"
 openSocket(6000)

if __name__=='__main__':
print "Mese running"
fakeCommandPort()
print "Mese done starting Thread"


Harald

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Re: app runs fine with interpreter, but not under py2exe

[GHUM]

Doug,
>   File "VisionTrainer.py", line 49, in 
>   File "SessionController.pyc", line 53, in 
>   File "VisionEgg\__init__.pyc", line 42, in 
>   File "VisionEgg\ParameterTypes.pyc", line 28, in 
>   File "Numeric.pyc", line 93, in 
>   File "Precision.pyc", line 26, in 
>   File "Precision.pyc", line 23, in _fill_table
>   File "Precision.pyc", line 18, in _get_precisions
> TypeError: data type not understood

to my knowledge, "data type not understood" is a message not from core
Python, but rather thrown from "your" code. What is happening around
Precision.py, line 18?

What does trigger that exception?

My guess is, you are dealing with some custom imported modules which
define "data type"s.
(PIL does something similiar for supported images)... that is, some
module is trying to import all definitions from a specific directory.

That "dynamic importing" fails within py2exe --- all the importing has
to be definit at py2exing-time. Please ready 
http://www.py2exe.org/index.cgi/PIL_and_py2exe
and the other receipe on py2exe.org and try to adapt that knowledge to
your application.

Harald

Harald
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Re: app runs fine with interpreter, but not under py2exe

[GHUM]

Doug,

> Precision.py is part of the Numeric package.  AFAIKT, the problem is during
> the module initialization.  The first lines of Precision.py are:
>
> from multiarray import zeros
> import string
>
[.]
and your program is crashing on the

lst.append( (zeros( (1,), t ).itemsize()*8, t) )   <-- Line 18

line... Please, try the following:

import multiarray
from multiarray import zeros
import string

(adding the line "import multiarray" before zeros are imported from
it)

I used this workaround with various packages I py2exed - maybe it also
works for you?

please keep us updated,

Harald

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Re: app runs fine with interpreter, but not under py2exe

[GHUM]

Doug,

> as I quickly noticed that "library.zip" does NOT contain ANY .pyd files.
> I'm guessing that they can't be in library.zip for a reason (i.e., they are
> DLL files, essentially, and thus must be readily available to be loaded
> into memory).

.dll and .pyd files CAN be within library.zip and even within the
single-file-exe.

There is some Hellermagic within _memimporter.pyd that loads the .dll
and .pyd from a zipfile. When you scan the build_exe.py, you will
explicitely find:

print "*** finding dlls needed ***"
dlls = self.find_dlls(extensions)
self.plat_finalize(mf.modules, py_files, extensions, dlls)
dlls = [item for item in dlls
if os.path.basename(item).lower() not in
self.dll_excludes]
# should we filter self.other_depends in the same way?

> Is there a work-around for this, then?
-rwxr-xr-x 1 morse None  26624 Nov 28  2006 dist/multiarray.pyd
-rwxr-xr-x 1 morse None 348160 Nov  8 16:16 dist/numpy/core/
multiarray.pyd
-rwxr-xr-x 1 morse None 192512 Nov  8 16:16 dist/numpy/core/
umath.pyd
-rwxr-xr-x 1 morse None  54272 Nov 28  2006 dist/umath.pyd

let's try: your mission is, should you chose to accept it, to make a
py2exed application to load two different multiarray.pyd, who are on
the visible level only different by their place in the file system.

So, please make a minimal script:

import multiarray
import numpy.core.multiarray as ncmultiarray

and, using Peters test
>>> from multiarray import zeros
assert zeros((1,), "1") == array([0], '1')

and check, if those multiarrays are the correct ones. If yes, you can
try to build upon this by making all imports explicit as described
above. (Yes, I know, that's not necessary in plain python ... but it
saved me in some weird "import from .zip" and "import from database"
situations.)

> (a) tell py2exe how to *correctly* handle multiple multiarray.pyd and
> umath.pyd files

somewhere deep inside I have a BAAAD feeling about to files having the
same name but very very different content - but that's not your call
in this situation.
Are you able to build that libraries yourself? Then you could move
down and build the multiarray.pyd as ncmultiarray.pyd and adjust all
imports accordingly. (lots of work)

> manual create the "stub"-like .pyc files that py2exe creates to point to
> these alternate .pyd files and then place these stubs in
> library.zip/numpy/core?  

As much as I know there is only one central "loader stub", which
ensures that .dlls get imported from memory, see above. py2exe does
not create something like p2elma.py containing "import multiarray.pyd"

best luck, and please take your time to scan the py2exe.org wiki,
there are many similiar challanges with various packages, maybe you
get another workaround-idea (and, if we find one, PLEASE put it down
there for others to learn)

best wishes,

Harald

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how long do the different python-vm bytecodes take?

[GHUM]

I looked at the virtual machine bytecode of python programs:

def f(whatever):
text="Hallo"+whatever
return text

import dis
dis.dis(f)
  2   0 LOAD_CONST   1 ('Hallo')
  3 LOAD_FAST0 (whatever)
  6 BINARY_ADD
  7 STORE_FAST   1 (text)

  3  10 LOAD_FAST1 (text)
 13 RETURN_VALUE


and now I am curious: how long does one LOAD_FAST take? I am thinking
of something like back in the assembler-world, where there existed
tables like:

LDA  -> 2 cycles
BNE  -> 2 cycles, 3 on branch

of course, the "real time" is dependand on many factors, esp. the
speed of the processor.
But ... is there a relative scale somewhere?

Somehting like

LOAD_CONST  1 arbitraryUnit
LOAD_FAST 1.9 arbitraryUnits
RETURN_VALUE   8.0 arbitraryUnits

???

my Google queries did not reveal anything usefull so far. Any hints?



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messages from pylint - need some reasoning

[GHUM]

Hello,

I am pylinting some software of mine.

Now pylint throws messages, and I know of pylint --help-msg to get
some more text. What is missing out are explanation, WHY some things
are bad, so I am searching for explanations and ways to improve my
code:

Example:
1st) "to many local variables"
I searched big G, and found: many local variables make it harder to
refactor, as all those variables will have to be passed to the
factored-out function. Even worse when the local variables are
mutable, and have to be passed back.


Similiar explanations I am searching for

2nd) "to many statements (in function / method)
okay, shorter functions are easier to grasp. Is there any more
reason?

3rd) space before operators, space after operators, space after ","
that's just readability, or is there some deaper reasoning?

4th) maximum line length
yeah, more then 80 chars suck when outputting to punching cards; but
any 21century reason for this default? (can and have made it higer)


5th) "Too many branches"
"Used when a function or method has too many branches, making it hard
to follow."

So what is the preferred way of repairng this?

Especially if the branches are something like:

if checkforcondition1():
# inlinecode
# to handlecondition1

if checkforcondition2():
# inlinecode
# to handlecondition1

[...]

and multiple conditions can be present at the same time.

Something like mytodolist=[ (tester1, handler1), (tester2,
handler2), ...] and

for tester, handler in mytodolist:
if tester(situation):
handler(situation)

would get rid of the branches; BUT... I cannot see how that is really
easier to follow.


Who can give me some hints to improve my code or arguments to switch
of that warnings?

best wishes,

Harald



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Re: indentation

[GHUM]

> I can't remember having seen any other "standard" so far.

there is this meme flowing around:

Thus spake the Lord: Thou shalt indent with four spaces. No more, no
less.
Four shall be the number of spaces thou shalt indent, and the number
of thy
indenting shall be four. Eight shalt thou not indent, nor either
indent thou
two, excepting that thou then proceed to four. Tabs are right out.


I Allways thought that was some of the interpretations of the ZEN of
Python, so, who can enlighten me of the origin?

Harald
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Re: Instructions on how to build py2exe 0.6.8 (or an installer would be nice, too!)

[GHUM]

Evan,

> I hear this problem is fixed in 0.6.8, but unfortunately there's no
> standalone installer for py2exe 0.6.8 - the most recent version that

Maybe you can solve your problem via updating the build_exe.py after
installing py2exe 0.6.6

So:
a) use the 0.6.6 installer
b) update the build_exe.py from 0.6.8

Possible?

Best wishes,

Harald
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Re: is it possible to add a property to an instance?

[GHUM]

> Does anyone know if it is possible to add a property to an instance at
> runtime? I didn't see anything about it in the standard library's new
> module, google hasn't turned up much either.

yes. You need nothing special, just add it:

class fish(object):
pass

a=fish()
a.legs=4
print a.legs

(or print (a.legs) on Python 3.0 and above)

so you add a property to an instance and proove that Darwin was right
in one go.

Harald
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Re: Corrupted images after attempting to store PNG images as BLOBs in MySQL?

[GHUM]

Keith,

> still becoming familiar with python. Originally we were not using the
> database to store images,
> but we started testing out storing images there as well as meta-data.

just a remark: I am using PostgreSQL to store BLOB-Data as there are
"Images", "PDFs", "Microsoft Office Files".

The system (application, network, database) is working quite okay up
to around 10 Megabytes per file. And that for around 7 years now.

The database itself comfortably works with up to 1Gig per object, just
the database drivers / network stack / bandwith / users patiance for
answers really gets... unreliable above 10 Meg per file.


Best wishes,

Harald

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Re: Python-by-example - new online guide to Python Standard Library

[GHUM]

Tobu,

I like this idea. Deducting from an example is really another way to
wisdom.

What struck me as most diffuclt to understand:

abs(-5.5) - 5.5

-> you are using "-" as symbol for "will give the result", which is
really, really hard to parse. Take something else, please. Unicode has
THAT many cool symbols. Or just -> or -=> or whatever.

Thanks for sharing that work!

Harald

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Re: Python Success stories

[GHUM]

> Which big aplications are written in python. I see its development,

There are no big applications written in Python.

Big applications are written in JAVA or COBOL or C# or other legacy
programming systems.

If you programm in Python, your applications become quite small. Only
frameworks in Python are big.

best wishes

Harald


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translating "create Semaphore" to Linux

[GHUM]

hello,

in my application I am using

hSem = win32event.CreateSemaphore (None, 1,
1,"stringincludinginterfaceandport")
rt=win32event.WaitForSingleObject (hSem, 0)
if rt != win32event.WAIT_TIMEOUT:
   really_do_start_my_app()
else:
   print "application allready running"

to make sure that only ONE instance of the application is running at a
time. (as it implements a local webserver, that is necessary. Two
webservers listening on one port is bad)

Now I am going to make this application run on Linux. How can I get
similiar behaviour on Linux?

I know of the .pid files that get written by some server processes ...
BUT they do not get cleaned up on unclean shutdown of the application.

is there some better method?

Or some module which wraps the details of .pid-files quite nicely?
(like "trying to remove to check if other instance is still
running, failing properly on missing write privs etc.)

best wishes,

Harald
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Re: translating "create Semaphore" to Linux

[GHUM]

Tim,

> ... why use a Semaphore rather than a Mutex?

as much as I understood the documentation at MSDN

http://msdn.microsoft.com/en-us/library/ms686927(VS.85).aspx
http://msdn.microsoft.com/en-us/library/ms686946(VS.85).aspx

a mutex seems to be nothing else than a special case of a semaphore?
That is, a semaphore can be created to allow  MAX_SEM_COUNT concurrent
runners, and MUTEX defaults to one and only one ...

The other api-spells are identical, like wait_for_...; so propably
I stumbled on the working Semaphore Code before, or in some ancient
win32 wrapper createMutex was not documented or something in that
aspect:)

> Or why notsimply use the bound socket as its own mutex? I know
> Windows won't allow you to rebind the same socket to the
> same addr/port in two different processes (unless perhaps
> you play some trickery with the socket options).

My experience was that this is correct for certain values of "allow"
and "trickery". Sometimes the binding seems to get allowed but does
not work. Main reason is that the socket-bind happens somewhere in
medusa or ; so to use it as a
semaphore I would have to dig there. I am not totally sure what
trickery on socket is played down there; and I prefer to stay as far
away as possible from that area.

Harald


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