Because the recipe plone.recipe.zope2instance relies on zc.recipe.egg, it also supports the python option. However, the recipe plone.recipe.zope2install did not support that nice option. I added the option and made a new 3.3 release.]]>
Det verkar nämligen på rubriken som om danskarna och OSCE tycker samma sak: Danskarna kritiserar, och OSCE är så uppgivna över sakernas dåliga tillstånd att de inte en ids komma.
Det svenska valsystemet har blivit föremål för en internationell debatt. Det är framför allt i danska tidningar som den svenska valsäkerheten blivit en het fråga
Läs mer: Valobservatörer nobbar det svenska riksdagsvalet | SvD
Men USA står mycket möjligt inför stora ekonomiska problem som kan göra att de inte kommer att kunna - eller vilja - garantera Europas säkerhet med samma emfas som idag.
Inom politiken kan man vara oense om vad staten skall göra, men ett gott försvar räknas alltid till kärnverksamheten. Europa behöver ta ett större ansvar för att kunna försvara vår frihet och välstånd.
The beginnings of a sound policy today, he argues, might be for America to withdraw from a costly war in Afghanistan and pull forces out of Europe. Such a move would shock Europeans who hope that the impact of their own defence cuts will be softened by American help in times of need.
Läs mer: do3cc: Don't catch import errors, use pkg_resources
]]>
I have written a script that wraps soundstretch and lame into a command that takes an mp3 file as input and outputs the bpm.
Internally, it converts the mp3 into temporary wav file with lame, runs soundstretch on the file, gets the bpm guess from soundstretch and fits that into a window of bpms.
I do not usually write command line scripts, so there may be problems in the below code, and there are certainly some hard coded assumptions. Use at your own risk. I intend to package this up and release it in some way, but until then, here is is in its present state:
#!/usr/bin/python
DOC = ''' This program detects bpm for mp3 files. It relies on lame and soundstretch being
installed on your system.
Usage:
%s <filename>
-or pipe filenames to it.
Example:
find . -name "*.mp3"| %s\n''' % (__file__, __file__)
import os
import pipes
import select
import shutil
import subprocess
import sys
import tempfile
## Define the window for sane bpm values. This may depend on genre of music. ##
BPM_WINDOW_MAX = 240
# Do not change this one
BPM_WINDOW_MIN = BPM_WINDOW_MAX/2
###############################################################################
def _get_bpm_from_soundstretch(output):
"""Gets bpm value from soundstretch output"""
output = output.split("\n")
for line in output:
if 'Detected BPM rate ' in line:
bpm = line[18:]
return float(bpm)
return None # Could not parse output
def fit_bpm_in_window(bpm_suggestion):
"""Double or halve a bpm suggestion until it fits inside the bpm window"""
if bpm_suggestion is not None:
while bpm_suggestion < (BPM_WINDOW_MIN):
bpm_suggestion = bpm_suggestion * 2
while bpm_suggestion > (BPM_WINDOW_MAX):
bpm_suggestion = bpm_suggestion / 2
return bpm_suggestion
def analyze_mp3(mp3filespec):
"""Uses lame and soundstretch to analyze an mp3 file for its bpm rate"""
# Make a temporary working directory for storing the wav file
# that soundstretch should analyze
workingdir = tempfile.mkdtemp()
wavfilespec = workingdir + "/tempwavfile.wav"
# Use lame to make a wav representation of the mp3 file to be analyzed
wav_command = 'lame --decode %s %s' % (mp3filespec, wavfilespec)
subprocess.call([wav_command], shell=True, stderr=open(os.devnull, 'w'))
# Call soundstretch to analyze the wav file
bpm_command = 'soundstretch %s -bpm' % wavfilespec
p = subprocess.Popen([bpm_command], shell=True,stdout=subprocess.PIPE)
output = p.communicate()[0]
# Delete temporary working directory and its contents
shutil.rmtree(workingdir)
bpm_suggestion = _get_bpm_from_soundstretch(output)
return fit_bpm_in_window(bpm_suggestion)
def process_input(mp3filespec):
bpm_suggestion = analyze_mp3(pipes.quote(mp3filespec))
if bpm_suggestion is None:
print "Unable to detect bpm for file %s" % mp3filespec
else:
print "BPM rate for %s is estimated to be %s" % (mp3filespec, bpm_suggestion)
if __name__ == "__main__":
argv = sys.argv[1:]
if select.select([sys.stdin], [], [], 0) == ([sys.stdin], [], []): # input is piped to program
mp3filespecs = sys.stdin.readlines()
for mp3filespec in mp3filespecs:
process_input(mp3filespec.rstrip('\n'))
elif len(argv) < 1: # No pipe and no input file, print help text and exit
print DOC
sys.exit()
else: # Input file present
mp3filespec = os.path.abspath(argv[0])
process_input(mp3filespec)
It needs soundstretch and lame to be installed.
]]>
On CentOS 5 there is a GUI for turning on and off services. on Ubuntu 10.4 I could not find anything similar installed. So I decided to go the the Ubuntu synaptic package installer and have a look around. I found bum and rcconf that both claim to have GUIs for editing runlevels, which seems close enough to what I needed.
Bum did not work. Bummer. It exited with the message: "cannot open display 1.0". I am testing through VNC to a daemonized tightVNC server, and maybe bum cannot handle that. Unrelated to this I had the same error message with an X utility called xcutsel, so maybe it is tightVNC doing something wrong, I do not know.
rcconf worked, but it took me a while to figure out what key on the keyboard toggles a service on and off. It is the spacebar.
Screenshot of rcconf. No mouse support, use pgUp and pgDown to scroll (or arrows), space bar to toggle and tab to switch to next UI element (i.e. the OK button, and then the Cancel button).
Eftersom börserna svänger varje dag, varje minut och varje sekund, så står det ju fritt att välja tidsintervall man vill rapportera. Att göra det till en daglig nyhet tillskriver dagsläget ett nyhetsvärde som det inte har. Om trenden är en fyraprocentig nedgång över en månad så är en tvåprocentig uppgång någonstans i mitten inte så intressant. Jag antar att man ändå rapporterar en snabb tvåprocentig uppgång för att vara först, eller i all fall inte sist, med nyheten.
Att rapportera det dagliga läget måste dock vara väldigt billigt att göra: Det är bara att läsa av förändringar under dagen, och lägga till ett känsloladdat ord: "Turbulens", "Uppgång", "Nedgång", "Oro". Det är inget fel att använda känsloladdade ord i sig för att beskriva en börs, känslor är i en funktion det vi använder för att koordinera en flock, men det blir lite mycket känslor upp och ner om man rapportera om det varje dag.
Nicholas Nassim Taleb rekommenderar i sin bok "The Black Swan" att man inte kollar börsen för ofta, just för att slippa den känslomässiga turbulensen kring rörelser som i det större perspektivet kan betraktas som slumpmässiga.
De ledande börserna i Asien steg under onsdagens handel i linje med börserna i New York. Undantaget var de kinesiska börserna.
Läs mer: Mest upp på Asiens börser - DN.se
This guide intends to show you how to build a headless server with tightvnc, such that you can remotely access the server’s gui using any vnc client. I’m still working on it, so if you have any comments or questions, please feel free to let me know.
Ubuntu TightVNC Server - Dave Lachapelle
I followed the instructions to a "T" and it worked. Lachapelle recommends you remove the geometry option for Ubuntu 10.4, but it worked fine on my 10.4 computer.
After install i ran the script as "/etc/init.d/vncserver start" once. Xtightvncserver then prompted me to define passwords for accessing the new desktop, one password for full control, and one for editing only.
You could extend the script to start several independent vnc sessions, to make the server work as a multiple desktop provider. That is how I use my CentOS 5 server (which is soon is going to be Ubuntified).
Update 2010-08-16, 2010-08-20
Currently drag and drop is broken in all remote desktop sessions in Gnome on Ubuntu 10.4, including then tightvnc. Everything else seems to work though, and in most cases you can get around drag and drop by e.g. instead do a cut and paste. However for e.g. reordering playlists in Rhythmbox there is no workaround. Actually I spend a bit of time trying to figure out why the heck drag and drop did not work, when everything else worked. A bug in Gnome itself was not the first thing that sprang to mind.
See here for bug report and workaround for the drag and drop issue:
https://bugs.launchpad.net/ubuntu/+source/gtk+2.0/+bug/587856
Basically, you need to slightly downgrade a couple of Gnome packages. I did this and drag and drop started working again. There is now what seems to be identification of the offending code upstream in the Gnome bug tracker, but it is not clear when a fix will find its way into Ubuntu.
The downgrade at the link above seems to be volatile. When you do other installs on your system, and possibly just straight updates, the downgraded Gnome packages will be replaced. I have currently done like this to fixate ("pin") the downgrade:
nano -w /etc/apt/preferences.d/pinGnomeForRemoteAccess
and in that file I put:
Package: libgtk2.0-0
Pin: version 2.20.0-0ubuntu4
Pin-Priority: 1001
Package: libgtk2.0-bin
Pin: version 2.20.0-0ubuntu4
Pin-Priority: 1001
Package: libgail18
Pin: version 2.20.0-0ubuntu4
Pin-Priority: 1001
Package: libgail-common
Pin: version 2.20.0-0ubuntu4
Pin-Priority: 1001
Package: gtk2-engines-pixbuf
Pin: version 2.20.0-0ubuntu4
Pin-Priority: 1001
I just performed this pinning so time will tell if it works, but it seemed to survive an apt-get update.
2010-08-26: Added version keyword to pin file
]]>
Rhythmbox will not initially identify the device. To get rhythmbox to see the device, you simply place a text file into the root directory of the player named '.is_audio_player' (/media/Sansa View/.is_audio_player).You can also tell rhythmbox where to store files it transfers to the device:
audio_folders=MUSIC/
folder_depth=2
Taken from: Sandisk Sansa View on Ubuntu Linux
This evening I tried filling out a form on Facebook that should give me the code for a Facebook button to put on a page. Trying with different browsers I could not get it to output any code, the submit did not seem to work. Analyzing the submit button, it submits to a url that if you just access it directly (i.e. a GET without parameters) you get some boiler plate code where you easily can replace relevant parts. I guess the form submit button will start to work again, but if not accessing the taget url directly works somewhat.
]]>Classicists have continued their efforts to suppress Wittgenstein's arguments up to the present day, e.g. on Wikipedia.
Läs mer: Incompleteness Theorems - a knol by Carl Hewitt (see http://carlhewitt.info)
Anthony skriver en lång och intressant artikel som redovisar synpunkter från olika svenska opinionsledare. Han avslutar med en undran om det kan vara så att svenskarna är överpragmatiska, att vi identifierar problem som ska lösas med utbildning, utan att ta in den större bilden av vad det är man försöker lösa.
Läs mer: Göran Lindberg and Sweden's dark side | feature | World news | The Observer
Having created my own MP3 content type in Plone, based on the File content type, I noticed the strange behavior that clicking on any MP3 in a folder contents listing would lead to a download of the MP3. Awkward.
Trying out the standard File content type, this does not happen; you get to the view of the content item instead.
So what's the difference? With File, there is "/view" appended to the url of each content item in the folder contents listing, with the MP3 file there is not. Time to look through the view configurations in XML for the two content types. There were differences, specifically File tacks on "/view" to the specification of "View". Changing this in MP3 made no difference.
Ok, time to take on the diving suit and chase down the code for the folder_contents view. Thankfully it was reasonably easy to find, in
./plone/app/content/browser/foldercontents.py
The view decides to tack on "/view" if the content type of the item to list is in this list:
use_view_action = site_properties.getProperty('typesUseViewActionInListings', ())
So, I added "MP3" on a line in the property "typesUseViewActionInListings" in the site_properties property sheet in portal_properties. And it worked. Not so obvious.
]]>How many estimates were accurate?]]>
svn diff --revision HEAD
...will give you that.
--revision N The client compares TARGET@N against working copy.
]]>
I needed to tag a whole directory tree of MP3 files with the genre tag "Salsa". This blog post is about whether the above mentioned command line tagging tools worked as expected with find and xargs to batch add a tag.
Now, a standard way in the shell on unixish systems to dig up files and pipe them to a command is something like this:
find -print0 -name "*.mp3"|xargs -0 tag-command --flags
"xargs" then executes tag-command for each item that find finds. The "-0" flag is to unpack the NULL delimited items xargs gets from find.
Here are the results:
find -print0 -name "*.mp3"|xargs -0 id3tool -G=Salsa
Error is: id3tool: Can't open file "." for write.
id3tool misinterprets the item spec it got
find -print0 -name "*.mp3"|xargs -0 id3ren -genre Salsa
id3ren: id3_read_file: Error reading .: Is a directory
id3ren does the same
find -print0 -name "*.mp3"|xargs -0 id3v2 -g 143
fopen: .: id3v2: Is a directory
..and id3v2 too
eyeD3 seemed to work like a charm though:
find -print0 -name "*.mp3"|xargs -0 eyeD3 -G Salsa
a file.mp3 [ 4.29 MB ]
-------------------------------------------------------------------------------
Time: 03:14 MPEG1, Layer III [ ~193 kb/s @ 44100 Hz - Joint stereo ]
-------------------------------------------------------------------------------
Setting track genre: Salsa
Writing tag...
ID3 v2.3:
title: artist:
album: year: None
track: genre: Salsa (id 143)
UserTextFrame: [Description: Tagging time]
2010-07-27T21:18:38
...and eyeD3 just chugged on like that, adding tags. Actually it added tags to my *.m3u playlists as well, even though these were not included in the output from find. eye3D seems to work recursively by default, and somehow it managed to divine something it deemed useful from find's output.
I used eye3D's --remove-tags flag to remove the tags from the playlists.
]]>This article will just focus on creating a really simple Media Player that you can play movies with.
Läs mer: wxPython: Creating a Simple Media Player « The Mouse Vs. The Python
One of our patterns with a phrase to help you remember it: "Yes please mama, I want cake, mama!" When you play it, "mama" is played with open notes, all the rest are closed. See, easy!]]>
I have not found any modules for python that does this. I have found one python module which will report the byte offset of where the data starts, but I guess that only works if the meta data are in the start of the file. The only command line tool I have found that can extract the data part is mp3cat:
This is the mp3cat home page. Download the latest release tarball mp3cat-0.4.tar.gz or (better) check out the current version from my subversion repository: http://svn.tomclegg.net/repos/trunk/mp3cat
My intial evaluation is favorable, i.e. an md5 hash of two files with different meta data but same music data gets the same hash value. Found mp3cat via this blog post:
The author wants the same thing I am searching for–the ability to generate a checksum of the audio stream and store it in the file header as a tag. Furthermore, he mentions his use of mp3cat! I pulled down a copy of mp3cat and compiled it on my archive box. Then the fun began
Tim's Mind Organized » Checksum mp3 audio frames (the data and not the headers)
There has at least existed one java program that does the data extraction and hashing in one fell swoop. It is mentioned in this discussion, but the download link does not seem to work.
Update 2010-07-25
I now looked into the CPAN archive, and as usual there is a Perl module, Audio::Digest::MP3 that does exactly what you want :-)
Audio::Digest::MP3 - Get a message digest for the audio stream out of an MP3 file (skipping ID3 tagsAudio::Digest::MP3 - search.cpan.org
Untested by me so far.
]]>soundstretch file.wav -bpmIt detects about 50% of my salsa music correctly. For better performance (~80%) and automatic bpm detection with a GUI, use the free Abyssmedia BPM Counter, and run it under Wine. For manual beat counting, use Salsa City Beat Counter.
What software can you use to count beats per minute in your songs using Linux? Although there is a slew of software on Windows, the selection is smaller on Linux. There are open source Linux products besides soundstretch that have beat counting code like Mixxx and BpmDj, so if someone could just factor out that code it could be a basis for generic libraries.
I you have looked at the Salsa City Beat Counter you may have noticed that it further down on the page says "bar" not "beat". Let's sort out the difference between bars per minute and beats per minute, and why at all you want to know any of those for a piece of music. For most music there will be 4 beats to a bar, so a song which has 160 bpm (beats per minute) has 40 bpm( ehrm, bars per minute). In this text bpm will henceforth always mean beats per minute.
The reason you want to know the bpm, well since you are reading this text you probably already precisely know why you want to know it, but generally speaking, it is useful in connection with dancing. If you are DJ'ing or practicing dancing, it is useful to play songs that fit in a certain range of dance speed.
I have written a wrapper around soundstretch for bpm assessment of mp3 files. It is here.
One of the most recommended automatic beat counters for Windows is MixMeister, but it does not run well under Wine on Linux according to the database at winehq.
There is a Linux native product calledd BpmDj, but I did not get it to compile in the time I was willing to spend with (and the pre compiled binary did not work on Ubuntu 9.10).
However Abyssmedia BPM Counter for Windows runs just fine under Wine, and does a pretty good job. With BPM counter you will have to read the bpm counts off the screen; there is no facility for writing back to the mp3 files or to a separate file. It detected 80% of my salsa music correctly, and there are many rhythms in salsa songs for a poor piece of software to latch on to. It did more or less consistently though report half the bpm of each song. I got about 70% of the songs classified at half speed. A simple reality check fixed that though: Salsa music ranges from 150 bpm to 210 bpm, so 96 bpm classification is actually 192 bpm. The same adjustments were made for soundstretch.
How do I know that it was correct? I double checked it (well not all songs, but many) with the javascript based manual beat counter Beat Counter, which runs in a browser, and hence works just fine under Linux. With Beat Counter, you start it with a mouse click and tap the beat with any key on the keyboard (do not use space bar on Linux though, it will scroll the page).
Bear in mind that the mouse click is counted as one tap, and if you casually start it with a mouse click and then wait a few secs before tapping, it will assume there was a super long beat between the mouse click and the first tap. This will result in the average bpm be wrong and slowly rise but never reach the true bpm of the song.
Update: Here is a better beat counter: Salsa City bar counter, a bit easier to use.
There is a piece of Dj software called Mixxx, that runs on Linux, it has beat counting built in, but it is quite awkward to use for bpm classification purposes, with many user interface steps for getting the bpm of one song. There is a checkbox for writing the bpm count to a tag on the mp3 file, but alas that checkbox is always disabled and from what I have found on the Internet the code for that checkbox has not been written yet.
Getting back to Mixmeister bpm analyzer, I finally gave in and installed it on a Windows Vista machine. It dumps the bpm data to a tab delimited data file, with bpm count as the last item in each row. I ran it on the same files as I had classified with BPM counter (and adjusted manually). In these I had encoded the bpm count right into the file name, and since the file names were included in the data file put out by mixmeister, it made for easy comparison of the bpm classifications of Mixmeister and Abyssmedia, and it turned out that they were often within one bpm. Reading more on the Internet it sems like Mixmeister does write to the bpm ID3v2 tag! It just doesn't tell you about it. Looking into one of the files I tested with in a hex editor there is indeed a TBPM field. It may be worth firing up Windows just for Mixmeister then, as long as it does not overwrite an existing BPM tag.
BPM Counter is a fast and accurate beats per minute detector for MP3 music.
BPM Counter - detect BPM of any song.
A manual Beats per Minute (BPM) counter for DJs. Counts the beats-per-minute of a song by tapping a key or the mouse to the beat of a song. Simply click on the page to start the time then tap any key to the beat.
The JavaScript Source: Math Related: Beat Counter
Trying to find something that writes to tags directly, I also tried BPM ProScan running in a win2k installation under vmware. It did not perform well on Salsa songs. As an example Lollobrigida by Ricardo Lemvo was classified as having 120 bpm. It has 180 bpm in the first half and a bit over 160 bpm in the second half. Other bpm counters sometimes get it at 90 bpm, which is understandable, but 120bpm is right out.
]]>Det är väl inte särskilt sannolikt att det är det faktum att planen är av fabrikatet Boeing som gjort att de låg nära varandra i luftrummet?
På Internet finns det ju gott om konspirationsteorier, och denna TT-artikel som jag såg i Svenskan fick nästan mig att börja tänka i sådana banor. Konkurrensen är hård mellan Airbus och Boeing, och vissa uttryck som t ex "If it's not Boeing, I'm not going", och "Scarebus" har fått fotfäste bland en del internetdebattörer. Det blir liksom viral marknadsföring om vilken tillverkare som är bäst.
Två Boeing - en 737 från SAS och en 757 från Finnair - med passagerare möttes den 2 juli 11 000 meter över Östersund. Kurserna skar varandra, höjden var densamma. Kollisionsrisken var uppenbar
Expressens nätupplaga skriver just nu på förstasidan att Pete Doherty gjorde bra ifrån sig under konserten på Arvikafestivalen, trots en incident med polisen efter konserten.
Här vill jag mena att det mest effektiva sättet att rent praktiskt hantera universum är att förutsätta att händelser som inträffar efter i tiden, inte kan påverka det som redan hänt. "Trots incidenten efteråt"???
I Svenskan kan man nu läsa att en tropisk sjukdom siktats i Frankrike, och:
Fallet var det första i Europa i år, men för några år sedan avled 77 personer på den franska ön Reúnion
Men Reúnion ligger tusen mil från Europa (i fyrkanten på wikipediakartan nedan):
Får väl skicka en tidspil till Expressen och en karta til SvD?
Taggar på intressant.se: nyheter,The sub woofer has connectors both for line in levels (250 mV or 775 mV I presume) and for speaker cable. I assume the speaker cable input is high impedance (kilo ohms or higher).
I thought about what the schematics could be for a simple speakers switch box, and below is what I came up with. It is untested:
Virtual servers, where you can think of a cloud of services where you pick and choose what you want and expand and contract your capacity in minutes, are becoming - I'd say - the premier choice for many outfits. There are a number of well-reputed providers, such as Amazon and Linode, but in the case of Amazon the smallest server is still rather big and pricey for being used as a alternative desktop or for throw-away development servers.
However Amazon's storage prices are low enough that having a number of standby servers, ready to recreate their state in seconds, could lend it to new applications, such as desktop machines and a company having a slew of development, staging and testing servers.
With the advent of persistent storage of your operating system on Amazon EC2 (September 2009) and now the brand new possibilty to use your own kernels, it ought to be possible for a virtual computer on the Amazon grid to be shut down with its state intact, saved to disk (i.e. hibernate), and the be woken up at later time, and you can just continue working where you are. There are such facilities in the Linux kernel, and there is also the Tux on ice project. Tux on ice allows you to save the RAM state to a file on the file system, so no need for a persistent swap partition.
This Feature Guide below is designed to teach System Administrators and other IT professionals how to utilize the User Provided Kernels in Amazon EC2. With this feature, Amazon allows you to load a para‐virtual Linux kernel within an Amazon Machine Image (AMI) or Amazon EBS volume. You can also now seamlessly upgrade the kernel on Amazon EBS‐backed instances.
Läs mer: Amazon Web Services Developer Community : Enabling User Provided Kernels in Amazon EC2
Heffner's trick is to create a site that lists a visitor's own IP address as one of those options. When a visitor comes to his booby-trapped site, a script runs that switches to its alternate IP address--in reality the user's own IP address--and accesses the visitor's home network, potentially hijacking their browser and gaining access to their router settings.
Läs mer: “Millions” Of Home Routers Vulnerable To Web Hack « The Firewall - Forbes.com
Så här fungerar attacken verkar det som:
As I understand it, it generally works like this: You set a ridiculously short TTL on the server hosting the exploit. When a victim connects you grab their IP address, add it and any other likely target IPs to the list of A records for the server and reload the zone. Your attack code just needs to wait for the TTL to expire, DNS to refresh and then try and connect to the target, which now appears to come from an attack on a trusted network.
Läs mer: Slashdot Comments | Millions of Home Routers Are Hackable
Here comes first two bulleted summaries of what is going on. Look further down in this post for a longer description:
Workflow
Technology
Plone is not very good at serving out big files. A couple of concurrent huge downloads would take up a lot of Zope processes and threads. Here is a way of offloading the file downloading to other server processes (in this case Apache) with authentication and authorization intact.
The stuff needed is
Let's look at how it is set up, going from the outside in:
The user is browsing the web site. The first thing the user's browser hits is the Apache server, sending the request further to Plone. The user may or may not be logged in. The virtual server directive in Apache looks something like this:
<VirtualHost *:80>
ServerName server.topdomain
proxyPreserveHost on
RewriteEngine On
# Match the __ac cookie if present, and make a new cookie with same value, but that can be sent to sub domains
RewriteCond %{HTTP_COOKIE} __ac=([^;]+) [NC]
RewriteRule ^/(.*) http://localhost:6080/VirtualHostBase/http/%{HTTP_HOST}:80/site/VirtualHostRoot/$1 [co=__download__ac:%1:.server.topdomain,L,P]
RewriteRule ^/(.*) http://localhost:6080/VirtualHostBase/http/%{HTTP_HOST}:80/site/VirtualHostRoot/$1 [L,P]
</VirtualHost>
The RewriteRule looks pretty standard, it rewrites the request to fit the virtual host monster in Plone, and the Plone site with the id "site" is served out. However there is some extra stuff, particularly the line:
RewriteCond %{HTTP_COOKIE} __ac=([^;]+) [NC]
This line is a condition, that is triggered if the incoming request has a cookie by the name "__ac". The "__ac" cookie contains information that authenticates the user to the Plone site. If your site uses another cookie than "__ac" then put its name here instead. It does not matter if the cookie contains just a session id or the login information. The important thing is this part:
([^;]+)
...it matches the cookie value, and the brackets mean that Apache remembers this part of the pattern. Since this is the first (and actually only) pair of brackets in the pattern, it will be remembered as %1 (Apache's way of denoting back references from the environment or http headers is with a percentage sign, inside a url pattern it is the standard dollar sign though).
Now, let's look at the rewrite rule:
RewriteRule ^/(.*) http://localhost:6080/VirtualHostBase/http/%{HTTP_HOST}:80/site/VirtualHostRoot/$1 [co=__download__ac:%1:.server.topdomain,L,P]
The first part is standard. The square brackets at the end usually only contains control flow information (such as "stop here" or somesuch) but within the square brackets at the end here there is also an instruction to send a cookie with the response out:
co=__download__ac:%1:.server.topdomain
We define here a new cookie called __download__ac (it can be called anything), but the important thing here is the dot in front of the domain. This means that the cookie is available to the domain server.topdomain and all sub domains. In this way this cookie can be shared with sub domains.
The standard __ac cookie in Plone does not have the capability to be shared with sub domains. The __ac cookie is a bit insecure because it actually contains the user name and password in scrambled form, but for other reasons we wanted to keep it with this system.
Another way of making the cookie shared would be to write a PAS plugin for Plone that can be configured to send out the cookie with a dot-prefixed domain qualifier, but the above rewrite is hard to beat for brevity.
If one goes with the more secure session cookie, there seem to be a PAS plugin that already allows configuration with a a dot-prefixed domain, and in that case the rewrite above is not necessary. Well, either way you do it, at this point you should have cookie with authentication information that can be read by sub domains.
When the user click on the download link he will be redirected to a sub domain. Let's look at the Apache configuration for that:
<VirtualHost *:80>
ServerName download.server.topdomain
DocumentRoot /var/www/html
<Location />
#Extend the Python path to locate your callable object
PythonPath "sys.path+['/var/www/mod_python']"
# Make Apache aware that we want to use mod_python
AddHandler mod_python .py
PythonAccessHandler downloadauth
</Location>
</VirtualHost>
This looks pretty much like a standard virtual server directive in Apache, for serving out static files from the file system. The only embellishment being that a python script gets registered to be access handler for all requests. This means that the script is actually not serving out any content, it just sits as a gatekeeper and says yay or nay to if Apache should serve out the requested content to the user.
As per the configuration above, the script is defined above as having the name "downloadauth.py" and that it should live in the "/var/www/mod_python" directory on the server. Let's take a look at that script:
#!/usr/bin/env python
# -*-python-*-
#
from mod_python import apache, Cookie
import xmlrpclib
from cookiestransport import CookiesTransport
PLONE_URL = 'http://192.168.1.51:6080/site'
def accesshandler(req):
"""Return apache.OK if the authentication was successful,
apache.HTTP_UNHAUTORIZED otherwise.
"""
plone_local_uri = "/".join(req.uri.split("/")[:-1])
xmlrpc_server_url = PLONE_URL + plone_local_uri
# Get the __ac cookie
cookies = Cookie.get_cookies(req)
# apache rewrite adds this cookie as a sub domain friendly copy of "__ac"
cookie = cookies.get('__download__ac', None)
cookies_spec = []
if cookie is not None:
cookie_value = cookie.value
# Cookies values are delivered wrapped in quotes
cookie_value = cookie_value.replace('"','')
# We configure xmlrpc to use it as "__ac"
cookie_spec = ['__ac', cookie_value]
cookies_spec.append(cookie_spec)
server = xmlrpclib.Server(xmlrpc_server_url, transport=CookiesTransport(cookies=cookies_spec))
if server.can_i_download():
return apache.OK
else:
return apache.HTTP_UNAUTHORIZED
This script takes the cookie we defined, and sends an xml-rpc call to Plone. The xml-rpc client is configured with a special transport agent that can take cookies. In this way the xml-rpc client get authenticated as the user doing the download. Plone runs on Zope and Zope supports xml-rpc out of the box. All we need now is to access a method in Plone that has the same acess rights as the file the user wants to download.
If we assume the object in Plone holding the download looks something like this:
object
method: download (permission: 'View')
method: can_i_download (permission: 'View')
I.e. it has two methods,
The first method is never going to be used; we do not want Plone to serve out the file from within Plone. However we make a note of what permission that method has (usually "View"). We then make a method "can_i_download" (or whatever name you fancy) with the same permission. This method just returns True. It can look like this:
security.declareProtected(permissions.View,'can_i_download')
def can_i_download(self):
"""If user has permission to run this method, he
has permission to download the file"""
return True
The code for the cookie aware transport class largely taken from:
Roberto Rocco Angeloni » Blog Archive » Xmlrpclib with cookie aware transport
My version does away with the ability to receive cookies from the server
Adds capabilty to configure client with arbitrary cookies from code
# A module with a class that allows the xmlrpc client to be configured with a list of cookies
# For authentication with plone xml-rpc methods
# Based completely on code from Rooco Angeloni:
# http://www.roccoangeloni.it/wp/2008/06/13/xmlrpclib-with-cookie-aware-transport/
import xmlrpclib
class CookiesTransport(xmlrpclib.Transport):
"""A transport class for xmlrpclib, that can be configured with
a list of cookies and uses them in the xml-rpc request"""
def __init__(self, cookies=[]):
""" cookies parameter should be a list of two item lists/tuples [id,value]"""
if hasattr(xmlrpclib.Transport, '__init__'):
xmlrpclib.Transport.__init__(self)
self.cookies=cookies
def request(self, host, handler, request_body, verbose=0):
# issue XML-RPC request
h = self.make_connection(host)
if verbose:
h.set_debuglevel(1)
self.send_request(h, handler, request_body)
self.send_host(h, host)
fo = open('/tmp/modpythonlogger.txt','a')
fo.write('Value for cookiespec is:%s\n' % self.cookies)
fo.close()
for cookie_spec in self.cookies:
h.putheader("Cookie", "%s=%s" % (cookie_spec[0],cookie_spec[1]) )
self.send_user_agent(h)
self.send_content(h, request_body)
errcode, errmsg, headers = h.getreply()
if errcode != 200:
raise xmlrpclib.ProtocolError(
host + handler,
errcode, errmsg,
headers
)
self.verbose = verbose
try:
sock = h._conn.sock
except AttributeError:
sock = None
return self._parse_response(h.getfile(), sock)
iw.fss is a very slick product for external storage from Ingeniweb. Deciding what fields should be stored externally can be done with a ZCML file, you do not need to touch the code of the content types.
iw.fss has a control panel that allows you to migrate the already stored data in the fields, to the external storage. In our case a good number of field migrations failed. It turned out that at least in our system (which was prepopulated from an old legacy system) the data was sometimes stored in an object type, "OFS.Image.Pdata", that iw.fss migration could not handle (a bug ticket has been submitted to the iw.fss people about this).
The following monkey patch (used with collective.monkeypatcher), stored in a "patches.py" file fixed that problem:
import cgi
from ZPublisher.HTTPRequest import FileUpload
import cStringIO
from iw.fss.FileSystemStorage import FileUploadIterator
old__init__ = FileUploadIterator.__init__
def new__init__(self, file, streamsize=1<<16):
""" this is a file upload """
if not hasattr(file, 'read') and hasattr(file,'data'):
data = str(file) # see OFS.Image.Pdata
fs = cgi.FieldStorage()
fs.file = cStringIO.StringIO(data)
file = FileUpload(fs)
return old__init__(self, file, streamsize)
...with the following ZCML:
<configure
xmlns="http://namespaces.zope.org/zope"
xmlns:monkey="http://namespaces.plone.org/monkey"
i18n_domain="my.application">
<include package="collective.monkeypatcher" />
<monkey:patch
description="Patching FileUploadIterator to handle OFS.Image.Pdata objects"
class="iw.fss.FileSystemStorage.FileUploadIterator"
original="__init__"
replacement=".patches.new__init__"
/>
</configure>
iw.fss can store the external files in different layouts, called "strategies". I chose "site2". "site2" mirrors the directory structure of Plone completely, and then adds the file in the innermost sub directory. Problem is, the path inside of Plone goes to the last sub directory, but Plone does not tack on the name of the file at the end of the url, i.e. if the file object in Plone has the url:
http://server.topdomain/afolder/another/folder/file_object
iw.fss will store it (with site2 layout) as:
/afolder/another/folder/file_object/filename
That "filename" can be anything. Thankfully iw.fss also stores a file next to the file with a fixed name "fss.cfg". This stores the name of the other file (the one we want to serve out).
I wrote a tool that can be configured with info on where on the file system iw.fss stores its data, and what the url is of the download server. Let's say the tools is called "tool_that_stores_fss_info". If you do not want to write a tool, a config sheet in portal_properties will do too.
In your file object, write a method that goes something like this:
security.declarePublic('redirectToExternalFile')
def redirectToExternalFile(self):
"""Redirects to external download url"""
sc_tool = getToolByName(self, 'tool_that_stores_fss_info')
portal_url = getToolByName(self, 'portal_url')()
local_url = self.absolute_url()[len(portal_url):] # Extract local part of url
file_path_to_download = sc_tool.fs_path_to_download_root + local_url
config = ConfigParser.ConfigParser()
config.read(file_path_to_download + '/fss.cfg')
file_name = config.get('FILENAME', 'file')
url_to_download = sc_tool.url_to_download_root + local_url + "/" + file_name
#return url_to_download
self.REQUEST.response.redirect(url_to_download)
Below is an fss configuration that works for a Plone site named "site" stored in the Zope root, using "site2" as storage layout, and the external files get stored inside the var directory of the buildout.
[fss]
recipe = iw.recipe.fss
zope-instances =
${instance:location}
storages =
# The first is always generic
global /
site /site site2 ${buildout:directory}/var/fss_storage_site
In the above case the files gets stored in the var directory inside of the Plone buildout. It may be a better idea to store it on the server in a directory structure with more permanence, like "/var/www/html" as is suggested in the Apache configuration for the dowload server earlier in this post. The var directory in a buildout does not get overwritten on invocations of buildout, but it is still in the buildout directory structure.
Make sure however you have the iw.fss storage on the same volume as the Plone buildout:
Many unixish systems have different directories (/tmp, /home, /var and so on) on different mounted volumes. Python's os.rename cannot handle this and therefore the code in iw.fss that uses os.rename cannot handle the storage being on a different mounted volumes (say, on "/var/www/html", when the Plone site is a buildout in the "/home" hierarchy). shutil.move may be an alternative to os.rename. (a bug ticket has been submitted to the iw.fss people about this).
What changes could be made to make this more of a solution ready out-of-the box, to be deployed on different servers?
Tramline (PloneTramline) uses Apache filters to intercept request and responses in Apache. In this way it can monitor all request and responses and insert a file on the way out, and take care of a file on the way in.
It would be cool if were possible to configure Apache in such a way that you can choose proxying based on the response headers (from the first proxy you try). If those response headers match some criterion (such has there being an "x-dowload-from-somewhere-else" header), Apache would simply switch to another server it proxies. I do not think it can be done, but this page talks about a possible implementation:
Taggar på intressant.se: forplanetplone,
Apparently, there is some research into finding algorithms that can automatically sift through and rank both people and documents, at heart using some heuristics, such as users that recommend or tag something early are more likely to be experts than later followers.
My co-worker Ching-man Au Yeung from University of Southampton and I presented the SPEAR algorithm in our joint paper "Telling Experts from Spammers: Expertise Ranking in Folksonomies" at the ACM SIGIR 2009 Conference
Läs mer: SPEAR Algorithm - Michael G. Noll
Almost every evening, between 8:30 and 10:00, my Wi-Fi just dies.
Läs mer: Slashdot Ask Slashdot Story | Tracking Down Wi-Fi Interference?
These OCR programs are probably not calibrated for making text out of pixel-perfect low-resolution screen shots, but from high-resolution somewhat noisy scans of different type faces on paper. Doing OCR from a screenshot ought to be quite easy: Each letter is pixel perfect and looks exactly the same, and there are no problems with slanting text or other distortions. In fact, writing your own OCR program is a distinct possibility for this.
I had via mail received a 72dpi screenshot that I wanted to get the text from. The top part looked like this:
The top of the screenshot
Tesseract, which is a program that is highly recommended on the web, returned nothing when run on this screenshot. At first after reading this, I thought this had to do with my tif possibly having a layer of transparency, but ensuring it was not there did not change anything.
According to the same discussion, it seems like tesseract wants to have a high resolution image (see tests on that further down).
Now the ocrad program returned this:
Al Po_ Po_ _ Al _|_o _|_o _ M_|_o_hl_o
lollob_IOldo _|_o_do l_m_o
A_ _ol__lo _ _|_o_do l_m_o
__ _o _| Colmo_ _ ____ _ ___ T__o_
OIOo Ml__ __o C_o_o_o_ O_O____o
llo_o_do__ _ l_|_ __llO_ Co__ol__
_| Mo_|___o O_O____o A_oOo_
A_ Amo_ C_o_do Woblo_ lo_ Ml_odo_ _ Alb___o Bo__o_ _| Tl_o_ D
_o_ldo B___lol _ _|_hl_ _o_ b Bobb_ c___
lo_ Tomoll_o_ D_ OIOo O_O____o A_oOo_ _o__
A_ld _o_ Bo_____o
_o_ Wo_ Wo_ B___o _|__o C_bo_ Plo____
...and so on.
Gocr returned this:
y 9 999) 9 9 _J ypp yyy y
AI P a n P a n Y AI Vin o Vin o m eIc o c hita
L oIIo brigid a Ric ard o L e m v o
A V aIeria Ric ard o L e m v o
Se Va EICaiman fru ko Y Sus Tesos
Oiga mire Vea Guayacan Orquesta
LIora n d ote L uis F eIi e G o n z aIe z
EImanisero Orquesta Aragȯn
A Amor Cuando HabIan Las miradas AIberto Barros''EITitan D.
S o nid o B e stiaI Ric hie R a 6 B o b b C ru z
Los TamaIitos De OIga Orquesta Aragȯn,Josė
A cid R a y B arretto
Ran Kan Kan Buena Vista Cuban PIayers
Undanta Bo Kas ers Orkester
...and so on, which given the non-outputting competition, must be deemed fantastic. Still, it cannot deal with any characters extending below the baseline (p, g and y for example), and all ls are interpreted as 1s.
Increasing the pixel density of the image
This turned out to be non trivial with the tools I had at hand. I finally got resampling working with the program pnmenlarge, part of the netpbm suite of command line unixish image processing tools:
cat salsatext.pnm | pnmenlarge 4 > enlarged.pnm
This quadrupled each pixel, and now tesseract magically started working!
(convert to to tif first)
Fil Pen Pen 'ii Fil '·.·'inp '·.·'inp et`} i···1el¤:p·:hite
Lpllplznrigide Riterdp Lem·-rp
.·!·.·-,# '·.·'elerie et`} Riterdp Lem·-rp
5e '·.·'e El Ceimen et`} Frulce 'ii 5us Tesps
Ciige i···1ire '·.·'ee Gueyeten Ordueste
Llprendpte et`} Luis Felipe Gpneelee
El i···1eniserp Ordueste ifiregdn
.·!·.·-,# Famer, Cuendp Hel:·len Les i···1iredes et`} .·!·.ll:¤ertp Eerrps "El Titen D. ..
Epnidp Eestiel et`} Richie Re·-,# El Epl:·l:·3r Crue
Lps Temelitps De Cilge Ordueste ifiregdn, _|pse
.·!·.¤:id Re·-,# Eerrettp
Ren Ken Ken Euene '·.·'iste ·Zul:·en F‘le3··ers
Llndenteg et`} Ep iiespers Orltester
Well, it does at least produce output, but the quality is at the point that you can barely guess which line it is trying to decode.
Let's try switching to Spanish as language:
.ü.| Pan Pan "x‛ .ü.| '·.·'ina '·.·'ina —l=*.`Š f'·'1a|·:·:··:|'•i|:a
La||a|:·ri·;|i·:|a F‘xi·:ar·:|a Lam'.«a
.ü.'-,« '·.·'a|aria —l=*.`Š F‘xi·:ar·:|a Lam'.«a
Sa '·.·'a El Caiman —l=*.`Š FrukJ:· "x‛ 5uS TaSaS
Diga Mira '·.·'aa Cuaşracan Dr·:]uaS|:a
Llarandata —l=*.`Š LuiS Falipa Ganzalaz
El f'·'1aniSara Dr·:]uaS|:a Aragón
.ü.'-,« Fumar, Cuanda Ha|:·|an LaS f'·'1ira·:|aS —l=*.`Š .ü.||:·ar|:·:· EarraS "EI Titan D. ..
Sanida EaS|:ia| —l=*.`Š F‘xi·:|'•ia Ra'-; Ex Ea|:·|:·ş» Cruz
LaS Tama|i|:aS Da Diga Dr·:]uaS|:a Aragón, _|aSa
.ü.·:i·:| Ra'-; Earratta
F‘xan Kan Kan Euana '·.·'iSta Cu|:·an F‘|aş·'arS
L|n·:|an|:a·; —l=*.`Š Ba kaS|:·arS DrkaStar
That was not good. Maybe the enlargement needs to be smoother?
pamstretch, also from the netpbm package, also increases pixel count but additionally smooths the output by interpolating pixels.
As many unixish tools, pamstretch takes data from stdin and outputs it to stdout:
cat salsatext.pnm | pamstretch 4 > stretched.pnm
Tesseract needs tif format, handled here by Imagemagick's convert command
convert stretched.pnm stretched.tif
run tesseract on it in this case with -l spa, which means Spanish language
tesseract stretched.tif str -l spa
The result:
AI Pan Pan 'l" AI Vino Vino —.?•.`$ Molcochita
Lollobrigida Ricardo Lomyo
Ay 'o‘aloria —.?•.`$ Ricardo Lomyo
5o 'o‘a El Caiman —.?•.`$ Fruko 'l" Sus Tosos
Diga Miro 'o‘oa Guayacan ûrquosta
Llorandoto —.?•.`$ Luis Folipo Gonzalo:
El Manisoro ûrquosta Aragon
Ay Amor, Cuando Hablan Las Miradas —.?•.`$ Alborto Barros "El Titan D. ..
5onido Eostial —.?•.`$ Richio Ray En Bobby Cruz
Los Tamalitos Do Olga ûrquosta Aragon, José
Acid Ray Earrotto
Ran Kan Kan Euona 'liista Cuban Playors
Undantag —.?•.`$ Bo Iäaspors ûrkostor
...better. Let's try English:
AI Pan Pan 'i" AI 'a'inu 'a'inu 3} Ms|cuchita
Lu||ubrigic|a Ricarclu Lsmyu
Ay 'a'a|sria 3} Ricarclu Lsmyu
5s 'a'a El Caiman 3} Fruku 'i" 5us Tssus
Diga Mirs 'a'sa Guayacan Drqussta
L|uranduts 3} Luis Fs|ips Gun:a|s:
El Manissru Drqussta Aragun
Ay Amur, Cuanclu Hab|an Las Miradas 3} Albsrtu Earrus "El Titan D. ..
5unic|u Esstia| 3} Richis Ray E: Eubby Cru:
Lus Tama|itus Ds D|ga Drqussta Aragun, juss
Acid Ray Earrsttu
Ran Iian Iian Eusna 'a'ista Cuban Playsrs
Unclantag 3} Eu Iiaspsrs Drksstsr
That is worse.
How does ocrad perform?
Al Pan Pan Y Al Vino Vino __ Melcochila
Lollobrigida Ricardo Lemvo
Ay Valeria __ Ricardo Lemvo
Se Va El Caiman __ FrukD Y Sus Tesos
Oiga Mire Vea Guayacan Orquesla
Llorandole __ Luis Felipe Gonzalez
El Manisero Orquesla Arag�n
Ay Amor, Cuando Nablan Las Miradas __ Alberlo Barros "El Tilan D,,,
Sonido Beslial __ Richie Ray bBobby Cruz
Los Tamalilos De Olga Orquesla Arag�n, los� , , ,
Acid Ray Barrello
Ran Kan Kan Buena Visla Cuban Players
Undanlag __ Bo Kaspers OrkPsler
A lot better than the line noise seen before. With enlarged but not interpolated:
Al Pan Pan Y Al Vino Vino __ Melcochi_a
Lollobrigida Ricardo Lemvo
Ay Valeria __ Ricardo Lemvo
Se Va El Caiman __ FrukoYSusTesos
Oiga Mire Vea Cuayacan Orques_a
Llorando_e __ Luis Felipe Conzalez
El Manisero Orques_a Arag�n
Ay Amor, Cuando Hablan Las Miradas __ Alber_o Barros "El Ti_an D,,,
Sonido Bes_ial __ Richie Ray b Bobby Cruz
Los Tamali_os De Olga Orques_a Arag�n, _os� ,,,
Acid Ray Barre__o
Ran Kan Kan Buena Vis_a Cuban Players
That's worse.
So, tesseract and ocrad needs the input to be "scannified" by multiplying the pixel count and interpolating to get a bit of smoothness, but they still do not clearly beat gocr.
For scanned in documents the ranking seems reversed.
Peter Selinger: Review of Linux OCR software:
Of course, it must be stressed that the test results reported here are derived from only two scanned pages. It is possible that for other inputs, the programs rank differently. However, based on the tests reported on this page, here is a summary of my conclusions:
* Tesseract gives extremely good output at a reasonable speed. It is the clear overall winner of the test. The only caveat is that one absolutely must convert the input to bitonal.
* Ocrad gives reasonable output at extremely high speed. It can be useful in applications where speed is more important than accuracy.
* GOCR gives poor output at a slow speed.
]]>
Nmap is good for this - use the -O option for OS fingerprinting and -oX "filename.xml" for output as xml
Läs mer: Get a list of all computers on a network w/o DNS - Stack Overflow
Nummerstationerna sänder istället ut något som verkar banalt och ointressant, men som innehåller viktig information. Syftet är att nå några få agenter med vanliga kortvågsradioapparater.
Aktiviteten har sjunkit sena kalla krigets slut, men det finns tydligen många igång fortfarande.
Efter en snabb titt på sajten Number Stations så kan man hitta sådana här guldkorn, som Papa November:
I remember tuning into a station in 1971 and being almost hypnotised by the strange interval signal (it is a different one now). It consisted of a female voice repeating "Papa November" over and over continuously with a sort of snake charmer's flute playing in the background. This went on for five minutes, after which a woman would start sending messages in five figure groups.Läs mer: G15 Papa November
Eller den franska tyrolerstationen:
Here is the full Tyrolean Music station transmission starting with a music box rendition of the "Internationale", followed by several yodelling songs with the message for Helmut, Kruse and Frank buried in there somewher
Hittade alltihopa via en Slashdotdiskussion:
Läs mer: G1 Tyrol
You never know, the Russian Woodpecker [wikipedia.org] signal turned out to be a nuclear launch detection radar in Chernobyl.
Läs mer: Slashdot Technology Story | Mysterious Radio Station UVB-76 Goes Offline
. However, this way of implementing purge does not support wildcard purge. If you want to do that, use something like: acl purge { "localhost"; "192.0.2.14"; } sub vcl_recv { if (req.request == "PURGE") { if (!client.ip ~ purge) { error 405 "Not allowed."; } purge("req.url ~ " req.url); } where the URL is then a regular expression to purge.
Läs mer: VCLExamplePurging – Varnish
Not an egg but a way to store references on the object instesd of in a catalog:
(untested by me)
Best way to set up a mirror?
This article describes how to set up an own mirror of the Python Package index (aka Cheese-Shop)
Läs mer: Setting up a PyPI mirror (with z3c.pypimirror) — BlueDynamics Alliance
Making sharing roles in plone via xml:
Specifically, it provides a GenericSetup handler to export/import the available roles. The file should be called sharing.xml, and have the following format:
Läs mer: Python Package Index : collective.sharingroles 1.0b4
Take a look at how the authentication is done:
The http proxy server will authenicate user credentials based on backend Plone user sources and provide a extra session on top of Plone's session (cookie).
Läs mer: Python Package Index : leocornus.django.ploneproxy 0.1dev-r420
An alternative to Getpaid? Should install this and take a look.
PCommerce (Plone commerce) provides a simple shop system which supports
Läs mer: Python Package Index : pcommerce.core 0.4
drainers is an abstraction around subprocess.Popen to read and control process output event-wise. It also allows you to abort running processes either gracefully or forcefully without having to directly interact with the processes or threads themself.
Läs mer: Python Package Index : drainers 0.0.3
This is practical for caching purposes: it is the ideal place to determine and insert caching headers into the response.
Läs mer: Python Package Index : plone.postpublicationhook 1.1
"parses an HTML file for external resources (JavaScript, CSS and image files) and assembles them into a stand-alone document"
Läs mer: Python Package Index : spackager 0.5.0
This can speed up repetitive web entry tasks, such as testing a web function through the browser over and over again:
Web testing framework intended for complete automation of user interface testing, with strong test debugging and recording capabilities.
Läs mer: Python Package Index : windmill 1.3
Update ZODB class references for moved or renamed classes
Läs mer: Python Package Index : zodbupdate 0.4
uwosh.timeslot offers a simple way to allow users of a Plone site to register for events (for example: training sessions).
Läs mer: Python Package Index : uwosh.timeslot 1.4.7
]]>
No one now knows how easy it would be to turbo-charge an existing human pathogen, or take one that infects another type of animal and assist its passage over the species barrier. We will soon find out, though.
Läs mer: Synthetic biology: And man made life | The Economist
Now if the buying if these shares is also automated, there may have been an area of prices that the automated selling and buying systems weren't configured for. For example, say share X is normally priced at $100. For some reason it is pushed to $80. A this point one system with a heck of a lot of shares sell, or several systems that all have roughly the same sell point, sell.
Now other automated systems snap up these cheap shares, but there are not enough of them so the price goes down a bit further, to say $75. At this price point the systems that just bought the shares sell again. Now there should be systems picking up at that price, but let's say that those (bottom feeding) systems may have been configured to trade not in one share but in a low market in general, preferring to snap up a combination of shares. So they do not buy one low share.
So basically the shares that were sold a pennies, were sold at pennies because they were deemed stable. Noone could imagine prices going so low for them, without a general market crash.
If this explanation or one similar is correct , we have encountered something counter intuitive:
That the shares went down to pennies because the companies are solid as rock.
A stop order triggers when a price goes under a specific price, and sells as a market order: It takes the best offer available at the time.
Läs mer: Slashdot Comments | New "Circuit Breaker" Imposed To Stop Market Crash
"Den som är satt i skuld är icke fri" hette Göran Perssons självbiografi. Nu visar det sig att de flesta länder i väst har skuldsatt sig så till den milda grad att det kommer att bli mycket svårt för dem att bli skuldfria: De besparingar som faktiskt krävs framför kan vara omöjliga att genomföra.
Johan Norberg skriver om skuldsättningen i Svenskan:
När bolag är bankrutta kan de räddas av staterna. När det gör staterna konkursfärdiga kan de räddas av EU. Men vem kan rädda EU?
En bro som slutar över avgrunden | Ledarsidan | SvD
Bank for International Settlement har gjort ett working paper och Bloggen Hotel Ivory har gjort en analys och visar ett diagram ur rapporten, på hur det går för olika länder med:
Observera att många länder inte kommer igenom skuldkrisen ens med de kraftigaste åtstramningarna (blå streckad linje).
Kanske bör dessa länder ställa in betalningarna? Ryssland gjorde det, likaså Mexiko för inte så länge sedan.
The only developed countries I see, that have pretty good fiscal discipline and will only be affected indirectly by the problems of the other countries are:
* Norway (thanks to the North Sea oil and gas, Norway’s balance sheet is rock solid – don’t think they have any net debt)
* Sweden
* Denmark (The currency is pegged to the euro though)
* Switzerland
* Singapore
* Canada
* Australia
* New Zealand
* and maybe South Korea , Taiwan and Chile
Läs mer: Well, Western World, that was a nice 500 year streak « Hotel Ivory
Det verkar som att de mörkare staplarna samlats i den övre delen av diagrammet.
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ffmpeg -y -i input.avi -ss 30 -t 10 -vcodec copy -acodec copy output.avi
mencoder -ss 1284 -endpos 102 movie.avi -oac copy -ovc copy -o movie-clip.av
mencoder also accepts hh:mm:ss format
mencoder -ss 1284 -endpos 102 movie.avi -oac copy -ovc copy -o movie-clip.avi
Läs mer: handy mencoder/ffmpeg commands
-h means print it human readable (with MB, kB)
-s mean summarize, i.e. don't print the size of sub directories
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