Confusing datetime.datetime
I've been struggling with an app that uses
Postgresql/Psycopg2/SQLAlchemy and I've come to this confusing
behaviour of datetime.datetime.
First of all, the "Seconds since Epoch" timestamps are always in UTC, so
shouldn't change with timezones. So I'd expect that a round trip of a
timestamp through datetime.datetime, shouldn't change it.
Now, all is good when I use a naive datetime.datetime
-- TZ=UTC python
>>> from datetime import datetime
>>> dt = datetime.fromtimestamp(1341446400)
>>> dt
datetime.datetime(2012, 7, 5, 0, 0)
>>> dt.strftime('%s')
'1341446400'
-- TZ=Asia/Tokyo python
>>> from datetime import datetime
>>> dt = datetime.fromtimestamp(1341446400)
>>> dt
datetime.datetime(2012, 7, 5, 9, 0)
>>> dt.strftime('%s')
'1341446400'
But when I use an timezone aware datetime.datetime objects, the
timestamp roundtrip is destroyed. I get 2 different timestamps.
Am I missing something here, I've been reading the datetime
documentation several times, but I can't understand what is the intended
behaviour.
-- TZ=UTC python
>>> from datetime import datetime
>>> import pytz
>>> tz = pytz.timezone('Europe/Skopje')
>>> dt = datetime.fromtimestamp(1341446400, tz)
>>> dt
datetime.datetime(2012, 7, 5, 2, 0, tzinfo=CEST+2:00:00 DST>)
>>> dt.strftime('%s')
'1341453600'
-- TZ=Asia/Tokyo python
>>> from datetime import datetime
>>> import pytz
>>> tz = pytz.timezone('Europe/Skopje')
>>> dt = datetime.fromtimestamp(1341446400, tz)
>>> dt
datetime.datetime(2012, 7, 5, 2, 0, tzinfo=CEST+2:00:00 DST>)
>>> dt.strftime('%s')
'1341421200'
Python 2.7.3, pytz 2012c
--
damjan
--
http://mail.python.org/mailman/listinfo/python-list
Re: Confusing datetime.datetime
On 05.07.2012 16:10, Damjan wrote:
I've been struggling with an app that uses
Postgresql/Psycopg2/SQLAlchemy and I've come to this confusing
behaviour of datetime.datetime.
Also this:
#! /usr/bin/python2
# retardations in python's datetime
import pytz
TZ = pytz.timezone('Europe/Skopje')
from datetime import datetime
x1 = datetime.now(tz=TZ)
x2 = datetime(x1.year, x1.month, x1.day, tzinfo=TZ)
assert x1.tzinfo == x2.tzinfo
WHY does the assert throw an error???
--
http://mail.python.org/mailman/listinfo/python-list
Re: Confusing datetime.datetime
from datetime import datetime, timedelta, tzinfo ZERO = timedelta(0) HOUR = timedelta(hours=1) class UTC(tzinfo): def utcoffset(self, dt): return ZERO def tzname(self, dt): return "UTC" def dst(self, dt): return ZERO utc = UTC() t1 = datetime.now(tz=utc) t2 = datetime(t1.year, t1.month, t1.day, tzinfo=utc) assert t1.tzinfo == t2.tzinfo No assertion error at all. This makes me think that the "retardation" as you put it is not in Python's datetime module at all, but in pytz. What does TZ == TZ give? If it returns False, I recommend you report it as a bug against the pytz module. It returns True, so it seems to be changed in the datetime object?? I tried both 2.7 and 3.2 -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: why greenlet, gevent or the stackless are needed?
On 07.07.2012 09:09, self.python wrote: (I'm very new to this coroutine part so It's not supposed to attack these modules, just I don't know the differences) atfer version 2.5, python officially support coroutine with yield. and then, why greenlet, gevent, Stackless python are still useful? it there somthing that "yield" can't do or just it is easier or powerful? The greenlet site has some very simple examples what it can provide. For example jumping from one function in another, and back http://greenlet.readthedocs.org/en/latest/index.html Gevent then uses greenlet to do lightweight "processes" (greenlets) that are I/O scheduled. This allows for a simple model of programming that scales to a large number of concurrent connections. You could do that with threads but you can't start as many threads as greenlets, since they have a much larger memory address space footprint. There's one function, called the gevent hub, that waits for any I/O event and then switches to the function that "blocked" on that I/O. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Confusing datetime.datetime
Because x1 and x2 have different time zones. The tzinfo field in x2 is equal to TZ and has a UTC offset of 1 hour. The tzinfo field in x1 contains the DST version of that timezone, with a UTC offset of 2 hours, because Skopje is currently on DST. I think you want: x2 = TZ.localize(datetime(x1.year, x1.month, x1.day)) That produces a datetime with the year, month and day set as indicated and tzinfo set to the correct UTC offset for that date, at 00:00 hours. Or maybe you need: x2 = TZ.localize(datetime(x1.year, x1.month, x1.day, 12)) x2 = x2.replace(hour=0) That determines whether DST should be on at noon, and then resets the hour field to zero. This produces the same outcome as the one liner, except on days when DST is switched on or off. Thanks, I think this will help me. Although these issues seem very much underdocumented in the datetime documentation. Are there any good references of using good times in Python? -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: 1 Million users.. I can't Scale!!
> If you want to use a multithreaded design, then simply use a python > Queue.Queue for each delivery channel. If you want to use a > multi-process design, devise a simple protocol for communicating those > messages from your generating database/process to your delivery channel > over TCP sockets. Is there some python module that provides a multi process Queue? -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Confused on Kid
> I was > investigating each subproject individually and could not, for the life > of me figure out how Kid worked. I understand that it takes a > well-formed XML document and transforms it, but I could not figure out > where it transforms it, or how to transform a document. They have > plenty of template examples, but I'm left say, "What do I do with this?" > I know I can't just pop in it a browser because it has no sort of style > sheet or anything so it would just render as an XML document. What do > you do after you have a kid template? KID is a pythonic template system. The KID templates are well-formed XML files but the generated document can be HTML or even plain text (this should be supported in some of the latest versions). The KID templates have some simple control structures like 'if' and 'for' which are modeled to be similar to python. The way it works is you feed the template some data and it generates HTML documents. The document can have a reference to a CSS file just like any other HTML page. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
cx_Oracle, is anything selected?
Is there a way to see if the SELECT in cx_Oracle didn't return anything? I want to optimize the situation when the number of selected rows is zero. Is select count(*) the only option, seems inefficient? -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: cx_Oracle, is anything selected?
>> Is there a way to see if the SELECT in cx_Oracle didn't return anything?
>> I want to optimize the situation when the number of selected rows is
>> zero. Is select count(*) the only option, seems inefficient?
>
> I don't understand your problem - if your select doesn't return
> anything, the fetch* methods on the cursor will tell you if there is any
> data to expect at all. Additionally there is teh rowcount-property that
> holds the number of rows the last execute* yielded.
This is a simplification of the program
c = db.cursor()
while 1:
c.execute('select ')
smtp = SMTP(MAIL_HOST, 25, 'localhost')
for address, subject, body in c:
smtp.sendmail()
smtp.quit()
time.sleep(60)
now if the select doesn't return any rows, there's no need to connect to the
mail server. I'd like to avoid that unnecessary step.
c.rowcount will not give me the number of rows selected, it will only give
me the number of rows already fetched.
--
damjan
--
http://mail.python.org/mailman/listinfo/python-list
Re: cx_Oracle, is anything selected?
> Apart from that: what harm does the connection to the smpt do? If it > works - keep it that way. I worry about being banned from the server. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: how to write a blog system with Python
> I am a fresh here , and I have no idea of it. > Do you have any comments? Take a look at aether, a single CGI script and it's easy to understand. http://www.logarithmic.net/pfh/aether -- damjan -- http://mail.python.org/mailman/listinfo/python-list
mod_python web-dav management system
Apache2 comes with builtin Web-dav support, but authorization is limited to Apache's methods, which are not very flexible. Now I've been thinking that it might be pretty easy to implement a authorization layer with mod_python (but living handling of the web-dav protocol to apache)... So, has anyone already done something similar? A management web-ui would be nice too. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: mod_python web-dav management system
> Zope has WebDAV support and is written in Python. You could > use Zope or perhaps use "parts" of it (since it is open source). I wouldn't use Zope as file storage. The ZODB is inefficient for storing big files. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: HTML generation vs PSP vs Templating Engines
> After some thought I decided to leave the various frameworks > aside for the time being and use mod_python.publisher along with some > means of generating HTML on the fly. I kind of like KID templates the most, you can easyly work with them in any HTML authoring software, they are easy to use (prety much pythonic). -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: python-mysqldb__debian_to_freebsd
> Is there any at all chance that this will work > with the proper configs or should I go ahead > and beg the host for an installation ? It seems to me very unlikely that a program compiled for FreeBSD would link to a library compiled for Debian Linux which in turn was linked to a Debian libmysql but now has to work with the FreeBSD libmysql... I just don't beleive you can make this work. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Unicode in MIMEText
Why doesn't this work:
from email.MIMEText import MIMEText
msg = MIMEText(u'\u043a\u0438\u0440\u0438\u043b\u0438\u0446\u0430')
msg.set_charset('utf-8')
msg.as_string()
Traceback (most recent call last):
File "", line 1, in ?
File "/usr/lib/python2.4/email/Message.py", line 129, in as_string
g.flatten(self, unixfrom=unixfrom)
File "/usr/lib/python2.4/email/Generator.py", line 82, in flatten
self._write(msg)
File "/usr/lib/python2.4/email/Generator.py", line 113, in _write
self._dispatch(msg)
File "/usr/lib/python2.4/email/Generator.py", line 139, in _dispatch
meth(msg)
File "/usr/lib/python2.4/email/Generator.py", line 180, in _handle_text
payload = cset.body_encode(payload)
File "/usr/lib/python2.4/email/Charset.py", line 366, in body_encode
return email.base64MIME.body_encode(s)
File "/usr/lib/python2.4/email/base64MIME.py", line 136, in encode
enc = b2a_base64(s[i:i + max_unencoded])
UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-7:
ordinal not in range(128)
--
damjan
--
http://mail.python.org/mailman/listinfo/python-list
Re: Unicode in MIMEText
> Why doesn't this work:
>
> from email.MIMEText import MIMEText
> msg = MIMEText(u'\u043a\u0438\u0440\u0438\u043b\u0438\u0446\u0430')
> msg.set_charset('utf-8')
> msg.as_string()
...
> UnicodeEncodeError: 'ascii' codec can't encode characters in position 0-7:
> ordinal not in range(128)
It's a real shame that unicode support in the python library is very weak
sometimes...
Anyway I solved my problem by patching email.Charset
--- Charset.py~ 2005-11-24 04:20:09.0 +0100
+++ Charset.py 2005-11-24 04:21:02.0 +0100
@@ -244,6 +244,8 @@
"""Convert a string from the input_codec to the output_codec."""
if self.input_codec <> self.output_codec:
return unicode(s, self.input_codec).encode(self.output_codec)
+elif isinstance(s, unicode):
+return s.encode(self.output_codec)
else:
return s
--
damjan
--
http://mail.python.org/mailman/listinfo/python-list
Re: ANNOUNCE: Mod_python 3.2.5 Beta
> The Apache Software Foundation and The Apache HTTP Server Project are
> pleased to announce the 3.2.5 Beta release mod_python.
http://www.modpython.org/live/mod_python-3.2.5b/doc-html/hand-pub-alg-auth.html
says "Since functions cannot be assigned attributes,..."
But that's not true (at least in 2.3 and 2.4):
>>> def f():
... return 'a'
...
>>> f.__auth__ = {1:'one'}
--
damjan
--
http://mail.python.org/mailman/listinfo/python-list
Re: Unicode in MIMEText
> ... and being concerned to improve the library you logged this patch in > Sourceforge for consideration by the developers? > > That's the only way to guarantee proper consideration of your fix. Ok I will, can you confirm that the patch is correct? Maybe I got something wrong? -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Any way to change files in a ZIP archive?
I am looking for a way to change a file that is inside a zip archive, in python of course. The thing is, I'm doing a CGI script that accepts a zip file (an OpenOffice document), I need to make some transformations to one of the files in the ZIP archive, but not touch any of the other files in it, and then send the result back. I've made the most of my script, but I can't find a way to replace (freshen) the file that's already in the archive? -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Unicode in MIMEText
patch submitted... > Thanks for taking the time to improve the quality of the Python library. Do you think it would be possible to do some kind of an automatic comprehensive test of compatibility of the standard library with unicode strings? -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Oracle 9i client for Linux
This is a list of files I use to compile cx_Oracle, php-oci amd perl DB::OCI on Linux. I set ORACLE_HOME to /usr/lib/oracle and symlink the *.so files in /usr/lib so that I don't need to set LD_LIBRARY_PATH. I guess this list can be reduced some more... but I got tired of experimenting And the instant client 10.0 will work with a 9i database, but will not work with some 8.0 and 8.1 databases. /usr/lib/oracle/lib/classes12.jar /usr/lib/oracle/lib/libclntsh.so.10.1 /usr/lib/oracle/lib/libnnz10.so /usr/lib/oracle/lib/libocci.so.10.1 /usr/lib/oracle/lib/libociei.so /usr/lib/oracle/lib/libocijdbc10.so /usr/lib/oracle/lib/ojdbc14.jar /usr/lib/oracle/lib/libclntsh.so /usr/lib/oracle/lib/libocci.so /usr/lib/oracle/rdbms/ /usr/lib/oracle/rdbms/public/ /usr/lib/oracle/rdbms/public/nzerror.h /usr/lib/oracle/rdbms/public/nzt.h /usr/lib/oracle/rdbms/public/occi.h /usr/lib/oracle/rdbms/public/occiAQ.h /usr/lib/oracle/rdbms/public/occiCommon.h /usr/lib/oracle/rdbms/public/occiControl.h /usr/lib/oracle/rdbms/public/occiData.h /usr/lib/oracle/rdbms/public/occiObjects.h /usr/lib/oracle/rdbms/public/oci.h /usr/lib/oracle/rdbms/public/oci1.h /usr/lib/oracle/rdbms/public/oci8dp.h /usr/lib/oracle/rdbms/public/ociap.h /usr/lib/oracle/rdbms/public/ociapr.h /usr/lib/oracle/rdbms/public/ocidef.h /usr/lib/oracle/rdbms/public/ocidem.h /usr/lib/oracle/rdbms/public/ocidfn.h /usr/lib/oracle/rdbms/public/ociextp.h /usr/lib/oracle/rdbms/public/ocikpr.h /usr/lib/oracle/rdbms/public/ocixmldb.h /usr/lib/oracle/rdbms/public/odci.h /usr/lib/oracle/rdbms/public/oratypes.h /usr/lib/oracle/rdbms/public/ori.h /usr/lib/oracle/rdbms/public/orid.h /usr/lib/oracle/rdbms/public/orl.h /usr/lib/oracle/rdbms/public/oro.h /usr/lib/oracle/rdbms/public/ort.h /usr/lib/oracle/rdbms/public/xa.h /usr/lib/oracle/rdbms/demo/ /usr/lib/oracle/rdbms/demo/cdemo81.c /usr/lib/oracle/rdbms/demo/demo.mk /usr/lib/oracle/rdbms/demo/occidemo.sql /usr/lib/oracle/rdbms/demo/occidemod.sql /usr/lib/oracle/rdbms/demo/occidml.cpp -- http://mail.python.org/mailman/listinfo/python-list
small inconsistency in ElementTree (1.2.6)
Attached is the smallest test case, that shows that ElementTree returns a string object if the text in the tree is only ascii, but returns a unicode object otherwise. This would make sense if the sting object and unicode object were interchangeable... but they are not - one example, the translate method is completelly different. I've tested with cElementTree (1.0.2) too, it has the same behaviour. Any suggestions? Do I need to check the output of ElementTree everytime, or there's some hidden switch to change this behaviour? from elementtree import ElementTree xml = """\ ascii \xd0\xba\xd0\xb8\xd1\x80\xd0\xb8\xd0\xbb\xd0\xb8\xd1\x86\xd0\xb0 """ tree = ElementTree.fromstring(xml) p1, p2 = tree.getchildren() print "type(p1.text):", type(p1.text) print "type(p2.text):", type(p2.text) -- http://mail.python.org/mailman/listinfo/python-list
Re: small inconsistency in ElementTree (1.2.6)
>> Do I need to check the output of ElementTree everytime, or there's some >> hidden switch to change this behaviour? > > no. > > ascii strings and unicode strings are perfectly interchangable, with some > minor exceptions. It's not only translate, it's decode too... probably other methods and behaviour differ too. And the bigger picture, string objects are really only byte sequences, while text is consisted of characters and that's what unicode strings are for, strings-made-of-characters. It seems to me more logical that an et.text to be a unicode object always. It's text, right! > if you find yourself using translate all the time > (why?), add an explicit conversion to the translate code. I'm using translate because I need it :) I'm currently just wrapping anything from ElementTree in unicode(), but this seems like an ugly step. > (fwiw, I'd say this is a bug in translate rather than in elementtree) I wonder what the python devels will say? ;) -- http://mail.python.org/mailman/listinfo/python-list
Re: small inconsistency in ElementTree (1.2.6)
>>> ascii strings and unicode strings are perfectly interchangable, with
>>> some minor exceptions.
>>
>> It's not only translate, it's decode too...
>
> why would you use decode on the strings you get back from ET ?
Long story... some time ago when computers wouldn't support charsets
people
invented so called "cyrillic fonts" - ie a font that has cyrillic
glyphs
mapped on the latin posstions. Since our cyrillic alphabet has 31
characters, some characters in said fonts were mapped to { or ~ etc..
Of
course this ,,sollution" is awful but it was the only one at the
time.
So I'm making a python script that takes an OpenDocument file and
translates
it to UTF-8...
ps. I use translate now, but I was making a general note that unicode
and
string objects are not 100% interchangeable. translate, encode, decode
are
especially problematic.
anyway, I wrap the output of ET in unicode() now... I don't see
another, better, sollution.
--
http://mail.python.org/mailman/listinfo/python-list
Python curses wizard
Is there some tool that can help me design a simple curses wizards, preferably one that uses Python, but if there's some other sollution I'd be happy to hear. The important requirement is that its curses based (or similar text based UI). -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: execute python code from db
> for python_code in c.fetchall(): > execute (python_code) > > Maybe feed python with stdin??. eval -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: importing a package
> I developed a package with a structure like this > src/ > tesfile.py > dir1/ > __init__.py > file1.py > dir2/ > __init__.py > file2.py Importing dir2/file2 from dir1/file1.py works here, because when yuo started the testfile script the src/ directory was added to the sys.path list. If you relocate dir1/ and dir2/ in a "package" directory here it will not work. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
MySQLdb reconnect
Does MySQLdb automatically reconnect if the connection to the database is broken? I'm asking this since I have a longrunning Python precess that is connected to Mysql-4.1.11, and I execute "set names utf8" when I connect to it. But after running a day the results from the python program were displayed as if the "set names utf8" was not executed i.e. I got question marks where utf-8 cyrillics should've appeared. After restarting the Python program everything was ok, just as when I first started it. The long running Python process is actually a scgi quixote web application. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: importing a package
> Indeed, when i do this, then it works
> import sys
> sys.path.append('package')
>
> However, why is it that package isn't added automatically to the pad?
When you execute a python program the directory where the program is is
automatically added to sys.path. No other directory is added to the default
builtin sys.path.
In you case (the second case), you can import package.dir2.file2.
--
damjan
--
http://mail.python.org/mailman/listinfo/python-list
Re: MySQLdb reconnect
> Does MySQLdb automatically reconnect if the connection to the database is
> broken?
It seems so.
> I'm asking this since I have a longrunning Python precess that is
> connected to Mysql-4.1.11, and I execute "set names utf8" when I connect
> to it.
>
> But after running a day the results from the python program were displayed
> as if the "set names utf8" was not executed i.e. I got question marks
> where utf-8 cyrillics should've appeared. After restarting the Python
> program everything was ok, just as when I first started it.
This is the sollution I've come to:
try:
# This will fail on MySQL < 4.1
db = MySQLdb.connect(godot.dbhost, godot.dbuser, godot.dbpass,
godot.dbname, use_unicode=1, init_command="set names utf8")
except MySQLdb.OperationalError:
db = MySQLdb.connect(godot.dbhost, godot.dbuser, godot.dbpass,
godot.dbname, use_unicode=1)
db.charset = 'utf8'
--
damjan
--
http://mail.python.org/mailman/listinfo/python-list
Re: ANN: CherryPy-2.1.0-beta released
> I am happy to announce the first beta release of CherryPy-2.1 Can you briefly compare CherryPy to Quixote2 (+session2)? > unicode decoding/encoding, This especially interesting to me. Is CherryPy completelly unicode (and UTF-8) ready. The thing that frustrates me about quixote2 is that it has a lot of assumptions that text is a str object in the latin1 encoding. I succeded to patch quixote to be usable but that may not be enough. My quixote application works with unicode objects all the time, and the only place I want UTF-8 is when the content is sent to the client... (or when its stored in a database or file which I handle myself fine). -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Python scripts wont run - HELP
> I'm a fairly literate windoz amateur programmer mostly in visual basic. I
> have switched to SuSE 9.2 Pro and am trying to quickly come up to speed
> with Python 2.3.4. I can run three or four line scripts from the command
> line but have not been able to execute a script from a file.
>
> I have used EMACS and JEDIT to create small test routines. I would right
> click the file and set properties to executable. I would then click the
> icon, the bouncy ball would do its thing then a dialog box would flash on
> the screen for a fraction of a second. I could tell it had a progress bar
> on it but could not catch anything else on it. Then nothing else would
> happen.
>
> If I could execute a script the world would once again be my playground...
> PLEASE HELP.
Open a terminal program like "konsole".
change the directory to where your files are ("cd /path/to/files/").
execute them ("python my-script.py').
--
damjan
--
http://mail.python.org/mailman/listinfo/python-list
Re: python image thumbnail generator?
Chris Dewin wrote: > Hi. I run a website for my band, and the other guys want an image gallery. > > I'm thinking it would be nice and easy, if we could just upload a jpg into > a dir called "gallery/". When the client clicks the "gallery" link, a > cgi script could search the gallery/ dir, and create thumbnails of any > jpeg images that don't already have a thumbnail associated with them. The > script could then generate a page of clickable thumbnails. Once I made an example mod_python handler, that resized images on the fly. For example: http://server/folder/image.jpg - would give you the original image, served directly by apache without any performance hit. http://server/folder/image.jpg?thumbnail - would resize the picture (and cache the result on disk) and return that, on a second request it would return the cached image very fast by calling an apache.send_file function. see http://www.modpython.org/pipermail/mod_python/2004-September/016471.html -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Python on WWW - beginners question: what to choose?
> I'm satisfied with concept of mps, however It's fine that author hate > writing HTML, but I want to; or better, I want to use Cheetah Templates - > i think they are better for bigger sites (then homepage) as the one I want > to write. Also, check out simpletal (http://www.owlfish.com/software/simpleTAL/) -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Big development in the GUI realm
> For all you GUI developers, things just got a little more interesting. > Trolltech will soon be offering the QT GUI toolkit for Windows under > the GPL license. That means that PyQt may become a much more popular > option in the near future. This applies to QT-4 only. I wonder how much of PyQT is ready for QT4? Anyway its time for a PyQT based VB-killer [ a GPL one :) ]. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Big development in the GUI realm
> Isn't this just the same thing with a different spin. There was always > an available distribution for linux for non-commercial use. Windows was > always the problem. You still can't use it for windows without knowing > how to compile the thing on windows. There'll be people that know how to compile :), and they'll be able to release & distibute binaries... Previously you couldn't even compile the GPL QT on windows, since it lacks the low-level win32 api calls that do all the work. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Big development in the GUI realm
> However, imagine simple situation: > 1. I write proprietary program with open plugin api. I even make the api > itself public domain. Program works by itself, does not contain any > GPL-ed code. > 2. Later someone writes plugin using the api (which is public domain so > is GPL compatible), plugin gets loaded into my software, significantly > affecting its functionality (UI, operations, file formats, whatever). > 3. Someone downloads the plugin and loads it into my program I don't think it is legal to distribute the plugin in binary form. OTOH it should be legal to distribute it as source code. > Am I bound by GPL? Certainly not, I did not sign or agree to it in way. correct -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Reportlab and Barcodes
> One of the users on the Reportlabs mailing list was kinda enough to
> offer me the solution.. A simple call to the drawOn function, e.g.:
>
> bc = code39.Standard39("123",xdim = .015*inch)
whats code39 in this example?
> x = 6*inch
> y = -5*inch
> bc.drawOn(canvas,x,y)
--
damjan
--
http://mail.python.org/mailman/listinfo/python-list
Re: Big development in the GUI realm
> The problem with this is what I've called the "patch hole" in another > context [1]. The problem with this definition is that I can *always* > distribute GPL'ed parts separately and re-combine them arbitrarily upon > execution, and it's not even particularly hard. Write your code with the > GPL'ed code embedded. At the end, before you distribute, extract it and > record the extraction so your program can "rewind it"; you're left with > nothing in your code that is GPLed. Later, the user will go get the GPL > software, and you software "rewinds" the extraction process, and the user > is left with something that is byte-for-byte identical to what you weren't > allowed to distribute by the GPL so what good was the GPL? What you described is not ok according to the GPL - since you distributed a binary thats derived from GPL software (and you didn't publish it source code under the GPL too). > Nobody really knows what the GPL means when it gets down to it; If you don't know, you should ask the person whose GPL code you are using. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
ElementTree, how to get the whole content of a tag
Given the folowing XML snippet, I build an ElementTree instance with et=ElementTree.fromstring(..). Now et.text returns just '\n text\n some other text'. Is there any way I could get everything between the and tag? text some other text and then some more -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: I can do it in sed...
Or, much nicer
> if line[:5]=='start': printing=1
if line.startswith('start'): printing=1
> if line[:3]=='end': printing=0
if line.endswith('end'): printing=0
--
damjan
--
http://mail.python.org/mailman/listinfo/python-list
Re: ElementTree, how to get the whole content of a tag
>> Is there any way I could get everything between the and tag? >> >> >> text >> some other text >> and then some more >> >>>> gettext(et) > '\n text\n some other text\n and then some more\n' I acctually need to get '\n text\n some other text\n and then some more\n' And if there were attributes in I'd want them too where they were. Can't I just get ALL the text between the tags? -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: MySQLdb problem with mod_python, please help
> MySQLdb is working fine at command line, however when I tried to use > it with mod_python, it give me a "server not initialized" error. Maybe its this problem? http://www.modpython.org/FAQ/faqw.py?req=show&file=faq02.013.htp -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: cross platform use of set locale
> SUS has added numeric grouping
>
>For some numeric conversions a radix character (`decimal
>point') or thousands' grouping character is used. The
>actual character used depends on the LC_NUMERIC part of
>the locale. The POSIX locale uses `.' as radix character,
>and does not have a grouping character. Thus,
>printf("%'.2f", 1234567.89);
>results in `1234567.89' in the POSIX locale, in
>`1234567,89' in the nl_NL locale, and in `1.234.567,89' in
>the da_DK locale.
Hmm, this C code on my system (mk_MK locale)
#include
#include
int main (void) {
setlocale(LC_ALL,"");
printf("%'.2f\n", 1234567.89);
return 0;
}
Outputs: 1 234 567,89 as expected.
But this Python program (2.3.4 [GCC 3.3.3] on linux2)
import locale
locale.setlocale(locale.LC_ALL, "")
print locale.format("%'.2f", 1234567.89, grouping=True)
complains about the ' in the format
ValueError: unsupported format character ''' (0x27) at index 1
without the ' it outputs: 1234567,89
--
damjan
--
http://mail.python.org/mailman/listinfo/python-list
Re: escape single and double quotes
> I'm working with a Python program to insert / update textual data into a > PostgreSQL database. The text has single and double quotes in it, and I > wonder: What is the easiest way to escape quotes in Python, similar to > the Perlism "$str =~ s/(['"])/\\$1/g;"? > > I tried the re.escape() method, but it escapes far too much, including > spaces and accented characters. I only want to escape single and double > quotes, everything else should be acceptable to the database. You don't need to escape text when using the Python DB-API. DB-API will do everything for you. For example: SQL = 'INSERT into TEMP data = %s' c.execute(SQL, """ text containing ' and ` and all other stuff we might read from the network""") You see, the SQL string contains a %s placeholder, but insetad of executing the simple string expansion SQL % """""", I call the execute method with the text as a second *parametar*. Everything else is magic :). -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: string join() method
> but perhaps the webserver sanitizes the output of CGI script and converts > plain "\n" into "\r\n" Yes apache does this, since it adds its own headers anyway it will replace all '\n' in the headers with '\r\n' and '\n\n' with '\r\n\r\n'. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: non-ascii charater image gereration with PIL
> PIL has 'text(position, string, options)' method in its ImageDraw module.
> Does this work with unicode or other 2byte encoded string?
> It seems not working on my python2.3.5 with PIL 1.1.5.
Yes, just tried and it works (python-2.4/PIL 1.1.5), but you also need a
font that supports your characters, see this script:
text = unicode('some cyrillic text: ÐÐÑÐÐÐ', 'utf-8')
from PIL import ImageFont, ImageDraw, Image
image = Image.new('RGB',(400,300))
draw = ImageDraw.Draw(image)
font = ImageFont.truetype(".fonts/dejavu-ttf/DejaVuSans.ttf", 12)
draw.text((10, 10), text, font=font)
image.save('wow.jpg')
--
damjan
--
http://mail.python.org/mailman/listinfo/python-list
Re: PyChart into web site error
>>>AttributeError: 'module' object has no attribute 'argv' >>> >>>Why my script doesn't have sys.argv? ... >> How are you serving the pages? > > Apache 2.0.48, mod_python 3.1.3 and Python 2.3.3 > on my mdk 10.0 Obviosly when using mod_python there's no sys.argv (and what would it contain if it existed??). Now the real question is why PyChart needs sys.argv? OTOH, maybe you can make a dummy sys module in your script that provides sys.argv?? BTW, I tested with Apache 2.0.53, mod_python 3.1.4 and Python 2.4 to confirm there's no sys.argv in the mod_python environment. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: using locales
> Is there some sort of tutorial on locales or the locale module? > > I can't seem to find a list showing all possible locales. I think this depends on the platform > Anyway, I'd love to have a method called get_available_locales to tell > me what I can use on my machine, or something like that. > > Can anyone tell me how I *do* get these names? In linux (glibc) you can see all locales with "locale -a". -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: quick unicode Q
>> Read it as a string, and then decode it with the .decode method. You
>> specify what encoding it's in.
>
> Most probably, the OP is asking what to do with an UTF-8 encoded string.
>
> To decode that, just use:
>
> s.decode("utf-8")
I prefer:
unicode(s, 'utf-8')
That way it's more clear that what you get is a unicode object.
--
http://mail.python.org/mailman/listinfo/python-list
Re: SVG rendering with Python
Do you want to create a SVG file or display a SVG file? SVG files are just XML so maybe you can create them easyly? -- http://mail.python.org/mailman/listinfo/python-list
Re: OO in Python? ^^
> sorry for my ignorance, but after reading the Python tutorial on > python.org, I'm sort of, well surprised about the lack of OOP > capabilities in python. Honestly, I don't even see the point at all of > how OO actually works in Python. > For one, is there any good reason why I should ever inherit from a > class? ^^ There is no functionality to check if a subclass correctly > implements an inherited interface and polymorphism seems to be missing > in Python as well. I kind of can't imagine in which circumstances > inheritance in Python helps. For example: Python IS Object Oriented, since everything is an object in Python, even functions, strings, modules, classes and class instances. But Python is also dynamically typed so inheritance and polymorphism, ideas coming from other languages, are not that much important. > Please give me hope that Python is still worth learning Python is different than C/C++, Java and co. If you can pass over it, you'll see for yourself if it's worth learning. -- http://mail.python.org/mailman/listinfo/python-list
Re: SMPP implementation in python
You can see some code here http://pysmpp.sourceforge.net/ but it's not complete... it need much more work. -- http://mail.python.org/mailman/listinfo/python-list
Re: unicode html
> Hi, I've found lots of material on the net about unicode html > conversions, but still i'm having many problems converting unicode > characters to html entities. Is there any available function to solve > this issue? > As an example I would like to do this kind of conversion: > \uc3B4 => ô '&#%d;' % ord(u'\u0430') or '&#x%x;' % ord(u'\u0430') > for all available html entities. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: ImportError: libclntsh.so.10.1: cannot open shared object file: Permission denied
> I am using RedHat Linux 4. and I developed an oracle 10g based > application by using cx_Oracle (cx_Oracle-4.1-10g-py23-1.i386.rpm) and > Python 2.3.4. > > When I run the application through direct console connection, It works > perfect. > > But, when I schedule a crontab job to run the application, It logs this > error: > > Traceback (most recent call last): > File "/home/nsm1/NSM1/NSM1.py", line 5, in ? > import cx_Oracle > ImportError: libclntsh.so.10.1: cannot open shared object file: > Permission denied ... > I have the following settings in my /etc/profile file: > > #--- > ORACLE_BASE=/home/oracle/oracle/product > ORACLE_HOME=$ORACLE_BASE/10.2.0/db_1 > LD_LIBRARY_PATH=$ORACLE_HOME/lib > PATH=$PATH:$ORACLE_HOME/bin > ORA_NLS33=$ORACLE_HOME/ocommon/nls/admin/data > export ORACLE_BASE ORACLE_HOME ORACLE_SID LD_LIBRARY_PATH PATH > #--- These environment variables are important for running any programs that use the oracle client libraries. The problem you have is that when you run the script from cron these environment variables are not set. Now, there are several ways how to handle this: 1. create a shell script that you call from cron, and it it set the environment variables and then call you python program 2. modify the environment in your python program (via os.environ) and then import cx_Oracle 3. modify your system so that no environment variables are neccesseary - actually this is not possible, but what I have is, symbolic links in /usr/lib to the libraries in $ORACLE_HOME/lib, thus I don't need the LD_LIBRARY_PATH variable, and the only other variable I need is the ORACLE_HOME, which is /usr/share/oracle on my system and it contains bin/ install/ lib/ network/ ocommon/ oracore/ rdbms/ sqlplus/ -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: threading+ftp+import => block
Panard wrote:
> Hi,
> I'm experiencing a strange problem while trying to manage a ftp connection
> into a separate thread.
>
> I'm on linux, python 2.4.3
>
> Here is a test :
> -- ftp_thread.py --
> import ftplib
> import threading
> import datetime
>
> class test( threading.Thread ) :
> ftp_conn = ftplib.FTP("localhost","user","pass")
> def run( self ) :
> print self.ftp_conn.pwd()
> self.ftp_conn.dir("/")
> print datetime.date.today()
> def t() :
> t = test()
> t.start()
> t.join()
> t()
> ---
>
> If I do :
> $ python ftp_thread.py
> /
> drwxrwsr-x 2 panard ftp 4096 Jul 24 12:48 archives
> 2006-07-24
> ==> Works perfectly
>
> But :
> $ python
>>>> import ftp_thread
> /
>
This has been documented in the blog posts titled "How well you know Python"
(find it on google)
The problem is that, once you run "import ftp_thread" a lock is set in the
Python interpreter, so then you can't start a new thread... (this from the
back of my mind).
--
damjan
--
http://mail.python.org/mailman/listinfo/python-list
Re: threading+ftp+import => block
Damjan wrote:
> Panard wrote:
>
>> Hi,
>> I'm experiencing a strange problem while trying to manage a ftp
>> connection into a separate thread.
>>
>> I'm on linux, python 2.4.3
>>
>> Here is a test :
>> -- ftp_thread.py --
>> import ftplib
>> import threading
>> import datetime
>>
>> class test( threading.Thread ) :
>> ftp_conn = ftplib.FTP("localhost","user","pass")
>> def run( self ) :
>> print self.ftp_conn.pwd()
>> self.ftp_conn.dir("/")
>> print datetime.date.today()
>> def t() :
>> t = test()
>> t.start()
>> t.join()
>> t()
>> ---
>>
>> If I do :
>> $ python ftp_thread.py
>> /
>> drwxrwsr-x 2 panard ftp 4096 Jul 24 12:48 archives
>> 2006-07-24
>> ==> Works perfectly
>>
>> But :
>> $ python
>>>>> import ftp_thread
>> /
>>
>
> This has been documented in the blog posts titled "How well you know
> Python" (find it on google)
>
> The problem is that, once you run "import ftp_thread" a lock is set in the
> Python interpreter, so then you can't start a new thread... (this from the
> back of my mind).
Actually, testing with
class test( threading.Thread ) :
def run( self ) :
print 'Hello'
instead of your test class, didn't show this anomally... actually the
problem is that "import ftp_thread" sets a lock on *importing* other
modules and I thing that the call to "self.ftp_conn.dir("/")" deep down in
the ftplib module tries to "import re" and that's where it hangs.
You could try to move the "import re" in ftplib to the top of the module,
and submit a patch to the Python bug system.
Here's a simpler test class that hangs:
import threading
class test(threading.Thread):
import string
print 'Step one'
def run(self):
import re
print 'Hangs before this when this file is imported'
def t() :
t = test()
t.start()
t.join()
t()
--
damjan
--
http://mail.python.org/mailman/listinfo/python-list
Re: Need a compelling argument to use Django instead of Rails
> A few months ago I had to choose between RoR and a Python framework > (TurboGears in that case). I picked TurboGears because of the language > maturity and all the third party libs. i.e. I can do PDF reporting with > reportLab, control OpenOffice with Python.. This is a good argument, you should make a list of all the greatest python libraries that you could use for your projects, for ex. reportlab, PIL, doctools, elementtree, sqlalchemy etc etc and try to "sell" that. BTW I'd choose TurboGears for it's flexibility, but I guess Django could be nice when more rapid results are needed (and the problem doesn't fall too far from the Django sweet spot). >> "Nah, we're not interested in Python." This is a hard attitude, but I have the same feeling about Ruby, I like Python and just don't see a reason to invest any time in Ruby (Rails or not).. and from that little I've seen from it.. I didn't like it. OTOH Ruby surelly is not that bad either. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: How to force a thread to stop
> | A common recovery mechanism in embedded systems is a watchdog timer, > | which is a hardware device that must be poked by the software every > | so often (e.g. by writing to some register). If too long an interval > | goes by without a poke, the WDT hard-resets the cpu. Normally the > | software would poke the WDT from its normal periodic timing routine. > | A loop like you describe would stop the timing routine from running, > | eventually resulting in a reset. > > *grin* - Yes of course - if the WDT was enabled - its something that I > have not seen on PC's yet... The intel 810 chipset (and all after that) has a builtin watchdog timer - unfortunetally on some motherboards it's disabled (I guess in the BIOS). How do I know that? Once I got Linux installed on a new machine and although the install went without a problem, after the first boot the machine would reboot on exactly 2 minutes. After a bit of poking around I found that hotplug detected the WDT support and loaded the driver for it (i8xx_tco), and it seems the WDT chip was set to start ticking right away after the driver poked it. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Windows vs. Linux
> Right now I run Windows as my main operating system. On my old > laptop I ran Ubuntu, and liked it very much; however, my new laptop has > a Broadcom wireless card, and it's not very Linux friendly. of topic: that Broadcom wireless card has a driver included in the latest kernel 2.6.17, and probably you could easily make it work if you make some upgrades to Ubuntu. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Need a compelling argument to use Django instead of Rails
>> I didn't realize you could do shared hosting with mod_python, because >> of the lack of security barriers between Python objects (i.e. someone >> else's application could reach into yours). You really need a >> separate interpreter per user. > > mod_python uses sub-interpreters - can be per virtual server, per > directory etc, cf > http://www.modpython.org/live/current/doc-html/dir-other-ipd.html > http://www.modpython.org/live/current/doc-html/dir-other-ipdv.html Yes, but your mod_python programs still run with the privileges of the Apache process, as are all the other mod_python programs. This means that my mod_python program can (at least) read files belonging to you - including your config file holding your database password. PHP solves this problem by using it's safe mode and basedir restrictions. Mod_python nor Python itself don't have this feature. There are sollutions for Apache that run each virtual host under a different uid but they have quirks: Metux MPM - http://www.metux.de/mpm/en/ mod_suid - for apache 1.3.x http://www.palsenberg.com/index.php/plain/projects/apache_1_xx_mod_suid mod_suid2 - for apache 2.0.x http://bluecoara.net/item24/cat5.html mod_ruid - seems to be an improvement of mod_suid2 http://websupport.sk/~stanojr/projects/mod_ruid/ But I see mod_python more as a way to extend Apache itself, than for running Python applications. A lot of the Apache mod_auth_* modules could be replaced with mod_python scripts. OTOH SCGI or FastCGI seem better sutied for python web (WSGI) applications. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Which Python API for PostgreSQL?
> I also recommend psycopg. But make sure you use psycopg2 -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: ImportError: libclntsh.so.10.1: cannot open shared object file: Permission denied
> I have a similar question (importing cx_Oracle, but not related to > cron). I would like to use solution #2 below and it does not work. If > I set LD_LIBRARY_PATH before running python, it works. If I try to set > it via os.environ, it does not work. > > I have tried this in an interactive Python shell. I can print the > value of os.environ["LD_LIBRARY_PATH"] and it is correct, but the > import fails. The cx_Oracle.so file is found, but when it tries to > load the necessary Oracle library (libclntsh.so.9.0), I get the > message: > > ImportError: libclntsh.so.9.0: cannot open shared object file: No > such file or directory > > Is there something else I have to do when changing os.environ before > trying the import? Well, all the oracle stuff is installed in /usr/lib/oracle on my computers (or /usr/share/oracle ... depends when and how I installed it), but I also always make the symbolic links in /usr/lib too. I guess once Python is started (and the C level library loader) you can't change LD_LIBRARY_PATH anymore. What I ussually set in os.environ is ORACLE_HOME because the oracle library still needs to find some additional files too. BTW cx_Oracle seems to only need /usr/lib/libnnz10.so and /usr/lib/libclntsh.so.10.1 but I also have these links in /usr/lib: libclntsh.so -> oracle/lib/libclntsh.so* (this is a link to the .so.10.1 file) libclntsh.so.10.1 -> oracle/lib/libclntsh.so.10.1* libnnz10.so -> oracle/lib/libnnz10.so* libocci.so -> oracle/lib/libocci.so* (this is a links to the .so.10.1 file libocci.so.10.1 -> oracle/lib/libocci.so.10.1* libociei.so -> oracle/lib/libociei.so* This is with oracle instant client 10 libraries. >> These environment variables are important for running any programs that >> use the oracle client libraries. The problem you have is that when you >> run the script from cron these environment variables are not set. >> >> Now, there are several ways how to handle this: >> 1. create a shell script that you call from cron, and it it set the >> environment variables and then call you python program >> >> 2. modify the environment in your python program (via os.environ) and >> then import cx_Oracle >> >> 3. modify your system so that no environment variables are neccesseary - >> actually this is not possible, but what I have is, symbolic links >> in /usr/lib to the libraries in $ORACLE_HOME/lib, thus I don't need the >> LD_LIBRARY_PATH variable, and the only other variable I need is the >> ORACLE_HOME, which is /usr/share/oracle on my system and it contains >> bin/ install/ lib/ network/ ocommon/ oracore/ rdbms/ sqlplus/ >> >> >> >> >> -- >> damjan -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Need a compelling argument to use Django instead of Rails
>> Yes, but your mod_python programs still run with the privileges of the >> Apache process, as are all the other mod_python programs. This means that >> my mod_python program can (at least) read files belonging to you - >> including your config file holding your database password > > I think a standard solution to this is to > associate each virtual host server to a > different port and have the main apache > redirect to the port. Inetd makes sure > that the vserver apache instance only > stays alive while it's needed. It might be > complicated to set up, but it works. > Again, something like this is probably > advisable anyway to limit the ways one > vserver can damage another generally > speaking. Starting a new Apache process with python included (trough mod_python) is even worse than CGI. But it seems AppArmor supports secureing mod_python (and mod_php and mod_perl) with a special Apache module (and the AppArmor support in the Linux kernel - yes this is Linux only). http://developer.novell.com/wiki/index.php/Apparmor_FAQ#How_do_AppArmor_and_SELinux_compare_with_regard_to_webserver_protection.3F Now that it's GPL AppArmor seems to get a lot of supporters. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: hide python code !
> Imagine if you were the single-person developer of a small application > that did something quite innovative, and charged a small fee for your > product. Now imagine you were practically forced to make your algorithm > obvious - a couple of months later, Microsoft bring out a freeware > version and destroy your business in an instant. Sure, they and others > can (and have) done that with closed-source products, but you increase > your chances of survival 10-fold if the key algorithms are not obvious. I think you increase your chances of Microsoft not even being in the same room with your software 100-fold if you release it under.. say GPL. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: WSGI - How Does It Affect Me?
> So I keep hearing more and more about this WSGI stuff, and honestly I
> still don't understand what it is exactly and how it differs from CGI
> in the fundamentals (Trying to research this on the web now)
>
> What I'm most confused about is how it affects me. I've been writing
> small CGI programs in Python for a while now whenever I have a need
> for a web program. Is CGI now considered "Bad"?
Well, mostly "yes" :)
> I've just always
> found it easier to write something quickly with the CGI library than
> to learn a framework and fool with installing it and making sure my
> web host supports it.
>
> Should I switch from CGI to WSGI? What does that even mean? What is
> the equivalent of a quick CGI script in WSGI, or do I have to use a
> framework even for that? What do I do if frameworks don't meet my
> needs and I don't have a desire to program my own?
def simple_app(environ, start_response):
"""Simplest possible application object"""
status = '200 OK'
response_headers = [('Content-type','text/plain')]
start_response(status, response_headers)
return ['Hello world!\n']
To serve it as a CGI just:
from wsgiref.handlers import CGIHandler
CGIHandler().run(simple_app)
It's not that complicated isn't it... and later you might want to move to
mod_python, scgi or fastcgi or IIS... you will not have to modify
simple_app a bit.
OR... you might want to use the EvalException middleware... just wrap your
simple_app like this:
app = EvalException(simple_app)
(well, due to it's simplicity EvalException can only work in single-process,
long running WSGI servers like not in CGI) so:
s = wsgiref.simple_server.make_server('',8080, app)
s.server_forever()
More info at
http://wsgi.org/wsgi/Learn_WSGI
> 3. Using IIS at all for that matter, does WSGI work on IIS, do any
> frameworks?
There's an IIS server gateway (WSGI server) but you can always run WSGI
applications with CGI, as seen above.
--
damjan
--
http://mail.python.org/mailman/listinfo/python-list
Re: is a wiki engine based on a cvs/svn a good idea?
> I'm planning to wite a fully featured wiki in Python in one of > frameworks. I've seen some notes about wiki/documentation management > scripts that use SVN as a data storage/versioning. Cool > I've been using SVN a bit but I don't know if it's a good idea to use > it in a wiki engine. Pro: versioning / diffs, Cons: you need your own > svn/cvs repository, can pyLucene or Xapwrap index this? You can certanly index the svn checkout if nothing else. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: ANN: PyQt v4.0 Released - Python Bindings for Qt v4
> QtNetwork > A set of classes to support TCP and UDP socket programming and higher > level protocols (eg. HTTP). Since QtNetwork is asynchronous how does it compare to twisted? I find Qt's signals and slots easier to understand and work with than twisted deferreds. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Python database access
> The odbc module is part of the Python Standard Library. Since when? -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Chapter 9 Tutorial for Classes Not Working
> class MyClass: > "A simple example class" > i = 12345 > def f(self): > return 'hello world' > > > From here I run: > x = MyClass Did you mean x = MyClass() > xf = x.f > while True: >print xf() > > This gives the following error: > > Traceback (most recent call last): > File "", line 2, in ? > TypeError: unbound method f() must be called with MyClass instance as > first argument (got nothing instead) > > Please help...this is killing me! What you are really calling is MyClass.f without any arguments. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Persistent Session in CGI
> I have started a new small web project, and was wondering if there are > any good guides on how to do Persistent Sessions and Authentication > using python and CGI. I don't really want too use Zope, because It's > probably overkill for my tiny project. Since you only mention Zope... Why not use TurboGears or Pylons or CleverHarold ... or anything WSGI based. Or if you want to make something minimal you could try Paste with (optionally) RhubarbTart. But.. WSGI is the new CGI (the lowest common denominator) in Python web development. So use it. The benefits: You can run your app as CGI, in mod_python, as a standalone http server, with SCGI/FastCGI. You'll benefit from authentication and session middleware. Middleware is a great WSGI concept, there are also caching middlewares etc.. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Persistent Session in CGI
> But.. WSGI is the new CGI Let me give you a minimal example using RhubarbTart (it depends on Paste) from rhubarbtart import request, response, expose from rhubarbtart import TartRootController class Root(TartRootController): @expose def index(self, msg="Hello world!"): response.headers['Content-type'] = 'text/plain' return msg app = Root() # # Now to serve it as a CGI script, just: # from wsgiref.handlers import CGIHandler CGIHandler().run(app) # # or to server it in a long running python-based HTTP server # from paste import httpserver httpserver.serve(app) # END of example Now this is just the begining to show you that it's not hard. But when you see what EvalException can do for you, you'll beg for more :) Hint: from paste.evalexception.middleware import EvalException app = EvalException(app) # then serve the app in the paste httpserver ... # but make some error in your python code to see it's results -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Egg problem (~/.python-eggs)
>> I'm trying to install a program that uses Durus on a server. It >> appears that if a Python program uses eggs, it creates a >> ~/.python-eggs/ directory, so the home directory must be writeable. >> This conflicts with server environments where you want to run a daemon >> with minimum privileges. Second, it appears to use the real user ID >> rather than the effective user ID to choose the home directory. In >> this case I'm trying to use start-stop-daemon on Linux to start my >> Python program, switching from user 'root' to user 'apache'. > > I solved the immediate problem by reinstalling Durus as a directory egg > rather than a compressed egg. So is the answer just not to use > compressed eggs? If the .egg file contains binary modules, those must be unpacked out of the .egg (a Zip file actually) so that the kernel/lib-loader can map them. If your .egg package doesn't have any binary modules, then it doesn't need to unpack anything. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Broadcast server
[EMAIL PROTECTED] wrote: > I would like to write a server with the low level API of python ( > socket+select and/or socket+thread ) that allow me to register client > and update them every X seconds ( could be the time, the temperature, a > stock quote, a message , ... ). > > How to write the server that keep hot connections with clients and > update them when events are trigerred. I don't know how to begin this , > i look at the python doc but the doc is more related to client updating > the server and i am not sure of the right design that could be use > here. I'd suggest to find the Richard W. Stevens book "Unix Network Programing". You'll learn a lot about networking from that book. It's based on C, but you'll see that the concepts can be easily used with Python too. Find that book, and don't forget the stdlib docs: http://docs.python.org/lib/module-socket.html http://docs.python.org/lib/module-select.html -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Python newbie with a problem writing files
> Code: > xml_output.write = (feed_title) How did you come up with that "=" there??! The correct line is: xml_output.write(feed_title) > Traceback (most recent call last): > File "C:/My_Blogroll/JJ_Blogroll2", line 11, in ? > xml_output.write = (feed_title) > AttributeError: 'file' object attribute 'write' is read-only -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: get the en of a program running in background
> It works when a click on a button launches a program P. > Now, I want that a click on another button launches another program P' > > In this case there is only one signal for two events : the end of P and > the end of P'. > How can distinct the two cases. Remember the PIDs of the forked procesess and in your signal handler use os.wait() to see which one has died. BTW os.wait() can work in non-blocking mode . -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: egg and modpython
> I applaud you for studying the traceback in more depth than I can find > the motivation for, Bruno. ;-) However, this looks like a program using > some package installed by setuptools/easy_install needs to unpack that > package when running. See news:[EMAIL PROTECTED] -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: BaseHTTPServer weirdness
>> But basically, you aren't providing a CGI environment, and that's why >> cgi.parse() isn't working. > > Clearly. So what should I be doing? Probably you'll need to read the source of cgi.parse_qs (like Steve did) and see what it needs from os.environ and then provide that (either in os.environ or in a custom environ dictionary). BUT why don't you use WSGI? -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a way to find IP address?
>> Normaly I can log user's IP address using os.environ["REMOTE_ADDR"] . >> If a user is behind a proxy, I will log proxy's IP address only. >> Is there a way how to find a real IP user's address? > > os.environ["HTTP_X_FORWARDED_FOR"] > > (but that can easily be spoofed, and is mostly meaningless if the user > uses local IP addresses at the other side of the proxy, so you should > use it with care) Yep, you should only use "HTTP_X_FORWARDED_FOR" if you trust the proxy and you check that the request is indeed coming from it (if environ["REMOTE_ADDR"] in proxy_list). -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there a way to find IP address?
>> > Normaly I can log user's IP address using os.environ["REMOTE_ADDR"] . >> > If a user is behind a proxy, I will log proxy's IP address only. >> > Is there a way how to find a real IP user's address? >> >> os.environ["HTTP_X_FORWARDED_FOR"] >> >> (but that can easily be spoofed, and is mostly meaningless if the user >> uses local IP addresses at the other side of the proxy, so you should >> use it with care) > How can be HTTP_X_FORWARDED_FOR easily spoofed? I thought that IP > address is not possible change. I can setup my browser to always send you a fake HTTP_X_FORWARDED_FOR header. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: CONSTRUCT - Adding Functionality to the Overall System
>> I understand that I can use __metaclass__ to create a class which >> modifies the behaviour of another class. >> >> How can I add this metaclass to *all* classes in the system? >> >> (In ruby I would alter the "Class" class) > > You'd have to set > > __metaclass__ = whatever > > at the top of each module whose classes are to get the new behavior. I think '__metaclass__ = whatever' affects only the creation of classes that would otherwise be old-style classes? > You can't alter classes which you don't control or create in your code. I remeber I've seen an implementation of import_with_metaclass somewhere on IBM's developerworks. I didn't quite undersntad it though. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: CONSTRUCT - Adding Functionality to the Overall System
>>> __metaclass__ = whatever >>> >>> at the top of each module whose classes are to get the new behavior. >> >> I think '__metaclass__ = whatever' affects only the creation of classes >> that would otherwise be old-style classes? > > Wrong. > > If you set __metaclass__ = type, every class in that module will be > new-style. >>> from UserDict import UserDict >>> type(UserDict) >>> class A(UserDict): ... pass >>> type(A) >>> __metaclass__ = type >>> class B(UserDict): ... pass >>> type(B) It seems that NOT every class in my module will be a new style class, especially those that inherit from other old-style classes in other modules. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: naming objects from string
manstey wrote: > Hi, > > But this doesn't work if I do: > > a=object() > x='bob' > locals()[x] = a > > How can I do this? try sys.modules[__name__].__dict__[x] = a But what's the point? -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Don't use regular expressions to "validate" email addresses (was: Ineed some help with a regexp please)
>> you'd create something to allow anyone to >> potentially spam the hell out of a system... > > I'm sorry, but I fail to see how validating (or not) an email address > could prevent using a webmail form for spamming. Care to elaborate ? The best way would be to implement some limiting features. Try two times from the same IP address in less than 10 minutes and you are banned for the day. Or some such. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
RE: CGI -> mod_python
> I'm confused. > > is WSGI only a specification, or are there implementations, and if so > which ones WSGI is only a specification. There are a lot of implementations: servers, middleware and almost all new Python web apps and frameworks are WSGI applications. Here is a list of WSGI servers (server gateways) http://wsgi.org/wsgi/Servers Start from here to learn more: http://wsgi.org/wsgi/Learn_WSGI Then come back, we'll discuss -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: lxml/ElementTree and .tail
> sure, the computing world is and has always been full of people who want > the simplest thing to look a lot harder than it actually is. after all, > *they* spent lots of time reading all the specifications, they've bought > all the books, and went to all the seminars, and have been sold all the expensive proprietary tools > so it's simply not fair when others are cheating. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Mod_python vs. application server like CherryPy?
> For example, consider an extreme case such as WSGI. Through a goal of > WSGI being portability it effectively ignores practically everything > that Apache has to offer. Thus although Apache offers support for > authentication and authorisation, a WSGI user would have to implement > this functionality themselves or use a third party WSGI component that > does it for them. OTOH WSGI auth middleware already supports more auth methods than apache2 itself. > Another example is Apache's support for enabling > compression of content returned to a client. The WSGI approach is again > to duplicate that functionality. the gzip middleware is really just an example... nobody would use that in production. > Similarly with other Apache features > such as URL rewriting, proxying, caching etc etc. Well, not everybody can use Apache ... and again there's already WSGI middleware that's more flexible than the Apache modules for most of the features you mention. It's not that I think mod_python doesn't have uses.. I just think it's not practical to make python web applications targeted solely to mod_python. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Is there any python-twisted tutorial or texts?
>> I want to study twisted of python . But I donot know how to start. >> Any suggistions? >> > > There is a book about using Twisted. It's called 'Twisted Network > Programming Essentials.' It is an entry-level book at best, but it does go > over quite a lot of things that the Twisted library is capable of. Well, the book is not that good. It completely fails to explain deferreds which are a central concept in Twisted. I only understood deferreds when watching Bob Ippolitos screencast about Mochikit which implements the same API as Twisted... Then I got back to the Twisted book. I think it needs more work. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Problem with curses and UTF-8
I just recompiled my python to link to ncursesw, and tried your example
with a little modification:
import curses, locale
locale.setlocale(locale.LC_ALL, '')
s = curses.initscr()
s.addstr(u'\u00c5 U+00C5 LATIN CAPITAL LETTER A WITH RING
ABOVE\n'.encode('utf-8') )
s.addstr(u'\u00f5 U+00F5 LATIN SMALL LETTER O WITH
TILDE\n'.encode('utf-8'))
s.refresh()
s.getstr()
curses.endwin()
And it works ok for me, Slackware-10.2, python-2.4.2, ncurses-5.4 all
in KDE's konsole.
My locale is mk_MK.UTF-8.
Now it would be great if python's curses module worked with unicode
strings directly.
--
http://mail.python.org/mailman/listinfo/python-list
Python 2.4.2 and Berkeley DB 4.4.20 ?
This is from the Slackware-current changelog: d/python-2.4.2-i486-1.tgz: Upgraded to python-2.4.2. The bsddb module didn't build against the new 4.4.x version of Berkeley DB. Does anyone care? Or perhaps have a patch? :-) Does anyone have a suggestion? -- http://mail.python.org/mailman/listinfo/python-list
Re: ANNOUNCE: Mod_python 3.2.7
Just upgraded from 3.1.4 / Apache-2.0.55, and I can confirm that both moin-1.5 and trac-0.9.3 continued to work without problems. -- http://mail.python.org/mailman/listinfo/python-list
Is there a WSGI sollutions repository somewhere
It seems that WSGI support starts to flourish is there some document or a web site that tracks what's out there, some place to pick and choose WSGI components? -- http://mail.python.org/mailman/listinfo/python-list
Re: PyQt issue
> Because you wrote curentText - note the missing t. :) You mean the missing 'r' :) -- http://mail.python.org/mailman/listinfo/python-list
a cx_Oracle ORA-01036 problem
I'm using Python 2.4, cx_Oracle-4.1 on Linux with Oracle instant client
10.1.0.3. This is the sql string:
SQL = """insert into D.D_NOTIFY values (:CARDREF, :BANKKEY, :OK1, :OK2 \
:DEBTEUR, :DEBTDEN, to_date(:INVOICE_DATE,'DD.MM.YY'),
to_date(:PAYMENT_DEADLINE,'DD.MM.YY'), :POINTS)"""
And I'm trying to execute it as:
c = db.cursor()
c.execute(SQL, CARDREF=id, BANKKEY=dc_kluc, OK1=okd, OK2=okc,
DEBTEUR=iznos_eur, DEBTDEN=iznos_mkd, INVOICE_DATE=datum_g,
PAYMENT_DEADLINE=datum_d, POINTS=bodovi)
And I get an ORA-01036 exception.
I also have tried
args = dict(CARDREF=id, BANKKEY=dc_kluc, OK1=okd, OK2=okc,
DEBTEUR=iznos_eur, DEBTDEN=iznos_mkd, INVOICE_DATE=datum_g,
PAYMENT_DEADLINE=datum_d, POINTS=bodovi)
c = db.cursor()
c.execute(SQL, **args)
Same thing.
Everything works If I use python string substituion, like this sql:
SQL = """insert into D.D_NOTIFY values (%s,'%s','%s','%s','%s','%s', \
to_date('%s','DD.MM.YY'),to_date('%s','DD.MM.YY'),'%s')""" % fields
Any ideas?
--
damjan
--
http://mail.python.org/mailman/listinfo/python-list
Re: a cx_Oracle ORA-01036 problem
vincent wehren wrote: > |c = db.cursor() > |c.execute(SQL, **args) > > > Shouldn't that be c.execute(SQL, args) (no **-unpacking of the > dictionary)? Actually I tried that too, I still get the same error. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: a cx_Oracle ORA-01036 problem
>> SQL = """insert into D.D_NOTIFY values (:CARDREF, :BANKKEY, :OK1, :OK2 \ >> :DEBTEUR, :DEBTDEN, to_date(:INVOICE_DATE,'DD.MM.YY'), >> to_date(:PAYMENT_DEADLINE,'DD.MM.YY'), :POINTS)""" >> > Try using a variable name other than "id" for the CARDREF variable... say > "card_id". id is a built in function name; I suspect your problem may be > that you are assiging that function to the variable rather than your > intended value... I changed it to 'cardref' but I'm still getting the same error. -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: Building a Python app with Mozilla
> Last I looked (3.1-ish), Qt didn't use the Aqua widgets Qt is now up to 4.3 and they use native Aqua -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Python IMAP web-access
Is there some project that implements web access to an IMAP store? Maybe something AJAXy like http://roundcube.net/?? -- damjan -- http://mail.python.org/mailman/listinfo/python-list
Re: encoding problems
> > is there a way to sort this string properly (sorted()?) > I mean first 'a' then 'à' then 'e' etc. (sorted puts accented letters at > the end). Or should I have to provide a comparison function to sorted? After setting the locale... locale.strcoll() -- damjan -- http://mail.python.org/mailman/listinfo/python-list
