jaux.net » Python http://jaux.net Discovering this wonderful world... Fri, 06 Jan 2012 07:49:47 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 http://jaux.net/2011/11/15/gnu-make-errors-in-recipes/ http://jaux.net/2011/11/15/gnu-make-errors-in-recipes/#comments Tue, 15 Nov 2011 17:15:42 +0000 jaux http://jaux.net/?p=593 Errors in Recipes

I have seen a rule in Python’s Makefile

-PYTHONPATH=$(DESTDIR)$(LIBDEST)  $(RUNSHARED) \
    $(HOSTPYTHON) -Wi -tt $(DESTDIR)$(LIBDEST)/compileall.py \
    -d $(LIBDEST) -f \
    -x 'bad_coding|badsyntax|site-packages|lib2to3/tests/data' \
    $(DESTDIR)$(LIBDEST)

The dash in front of the command is to let `make` never mind the return value of the command and continue executing the next command.

]]> http://jaux.net/2011/11/15/gnu-make-errors-in-recipes/feed/ 0 http://jaux.net/2011/09/28/porting-to-python3/ http://jaux.net/2011/09/28/porting-to-python3/#comments Wed, 28 Sep 2011 17:07:47 +0000 jaux http://jaux.net/?p=553 Porting to Python 3: An in-depth guide

It’s time to ride on Python 3!

]]> http://jaux.net/2011/09/28/porting-to-python3/feed/ 0 http://jaux.net/2011/09/26/python-attributes-methods/ http://jaux.net/2011/09/26/python-attributes-methods/#comments Mon, 26 Sep 2011 15:55:44 +0000 jaux http://jaux.net/?p=541 Python Attributes and Methods

Now I know what descriptor is :D

]]> http://jaux.net/2011/09/26/python-attributes-methods/feed/ 0 http://jaux.net/2011/09/23/new-deprecation/ http://jaux.net/2011/09/23/new-deprecation/#comments Fri, 23 Sep 2011 17:41:29 +0000 jaux http://jaux.net/?p=538 Guido’s Explanation on __new__ Deprecation Warning

]]> http://jaux.net/2011/09/23/new-deprecation/feed/ 0 http://jaux.net/2011/09/15/gc-garbage/ http://jaux.net/2011/09/15/gc-garbage/#comments Thu, 15 Sep 2011 19:35:33 +0000 jaux http://jaux.net/?p=523 gc.garbage

In my Pyramid view classes, I defined __del__(), and I guess there were reference cycle had been introduced inside the framework (which I couldn’t easily see), so all the view callable objects were not garbage collected.

]]> http://jaux.net/2011/09/15/gc-garbage/feed/ 0 http://jaux.net/2011/09/15/debugging-python-memory-leaks/ http://jaux.net/2011/09/15/debugging-python-memory-leaks/#comments Thu, 15 Sep 2011 15:12:23 +0000 jaux http://jaux.net/?p=520 Debugging memory leaks

A MUST read when investigating Python program memory problems!

]]> http://jaux.net/2011/09/15/debugging-python-memory-leaks/feed/ 0 SQLite3: Unable to Open Database File http://jaux.net/2008/12/18/sqlite3-unable-to-open-database-file/ http://jaux.net/2008/12/18/sqlite3-unable-to-open-database-file/#comments Fri, 19 Dec 2008 02:52:32 +0000 jaux http://jaux.net/?p=205 Continue reading →]]> Recently, I’m working on my Skypiea project which is powered by SQLite3 and Python (as CGI script). Yesterday I encountered a program: When the web server ran a CGI script which would update the database, I got an error message said “sqlite3.OperationalError: unable to open database file“.

I searched the web and Google told me I need to specify the full path (no ~ or $HOME etc.) of the database file and the web server needs the write permission to the file. Sure, I actually had done both before the exception occurred.

Having being pissed for a while, I finally figured out what was wrong here: The web server needs the write permission to not only the database file, but also the containing directory of that file.

Yea, just simple like that.

]]> http://jaux.net/2008/12/18/sqlite3-unable-to-open-database-file/feed/ 40 Simple Weather Script for Conky http://jaux.net/2008/12/13/weather-script-for-conky/ http://jaux.net/2008/12/13/weather-script-for-conky/#comments Sat, 13 Dec 2008 06:32:10 +0000 jaux http://jaux.net/?p=183 = 2.5 How to use it: Download weather.py. Edit the file, fill in … Continue reading →]]> Wanna Conky to show your local weather? You might had found tons of solutions already on the web, but here comes a simpler one: SimpleWeather.

Requirement:

How to use it:

  1. Download weather.py.
  2. Edit the file, fill in required parameters (read CONFIGURATION first).
  3. Add ${execi 3600 python the_path_to/weahter.py} to your .conkyrc.
]]> http://jaux.net/2008/12/13/weather-script-for-conky/feed/ 1 Windows Vista: Install Python 2.6 for all users http://jaux.net/2008/10/02/windows-vista-install-python-26-for-all-users/ http://jaux.net/2008/10/02/windows-vista-install-python-26-for-all-users/#comments Thu, 02 Oct 2008 23:19:59 +0000 jaux http://jaux.net/?p=113 Continue reading →]]> Python 2.6 final was release yesterday. If you are using Windows Vista and you want to install Python 2.6 for all users, but the “Vista Note” from the release page does not work for you, you may try this:

  1. Run the command line program (cmd/powershell) as Administrator (right-click -> Run as Administrator), then issue the following command:
  2. msiexec /i path_to_the_msi\python-2.6.msi

That’s it!

]]> http://jaux.net/2008/10/02/windows-vista-install-python-26-for-all-users/feed/ 12