Start a Python shell and import settings to view your Django project settings
python manage.py shell >>> import settings >>> settings.ROOT_URLCONF 'myproject.urls'
July 25th, 2011 § 0 comments § permalink
Start a Python shell and import settings to view your Django project settings
python manage.py shell >>> import settings >>> settings.ROOT_URLCONF 'myproject.urls'
July 24th, 2011 § 1 comment § permalink
Some condensed notes on the Django tutorial (Django 1.3) This is just a short self-reference (or maybe a 2-minute overview), not an actual tutorial.
Create / update database
python manage.py syncdbModels define how data is stored. Create a model by inheriting from django.db.models.Model
from django.db import models class Choice(models.Model): poll = models.ForeignKey(Poll) choice = models.CharField(max_length=200) votes = models.IntegerField() def __unicode__(self): return self.choice
An “app” is simply a directory with an __init__.py file and other python files. (An “app” is more commonly known in other languages as a “package”.)
The INSTALLED_APPS variable in settings.py tells Django which apps to use.
INSTALLED_APPS = ( 'django.contrib.auth', 'django.contrib.contenttypes', 'django.contrib.sessions', 'django.contrib.sites', 'polls' )
Make sure your app directory is on your Python path.
Re-run python manage.py syncdb after making changes to the INSTALLED_APPS.
The variable urlpatterns tells Django which Python code to run (which view to use) based on the url path.
from django.conf.urls.defaults import patterns, include, url from django.contrib import admin admin.autodiscover() urlpatterns = patterns('', (r'^polls/$', 'polls.views.index'), (r'^polls/(?P <poll_id>\d+)/$', 'polls.views.detail'), url(r'^admin/', include(admin.site.urls)), )
The ROOT_URLCONF variable in settings.py tells Django where to find the module-level variable urlpatterns. E.g. if urlpatterns is defined in mysite/urls.py, the settings.py file should have
ROOT_URLCONF = 'mysite.urls'The code used to generate a page is called a view. A view is a Python function which returns a web page. Example index() view in polls/views.py
from django.template import Context, loader from polls.models import Poll from django.http import HttpResponse def index(request): latest_poll_list = Poll.objects.all().order_by('-pub_date')[:5] t = loader.get_template('polls/index.html') c = Context({ 'latest_poll_list': latest_poll_list, }) return HttpResponse(t.render(c))
The urlpatterns tells Django which view to use based on the url. For example, the urlpatterns line
(r'^polls/$', 'polls.views.index'),
tells Django that the url http://site.com/polls is created by the index() function in polls/views.py.
render_to_response is a common shortcut for creating views. Equivalent view using render_to_response
from django.shortcuts import render_to_response from polls.models import Poll def index(request): latest_poll_list = Poll.objects.all().order_by('-pub_date')[:5] return render_to_response('polls/index.html', {'latest_poll_list': latest_poll_list})
Often views need to respond to a request. Templates use the {% csrf_token %} to prevent “Cross Site Request Forgeries”, and the view uses a django.template.RequestContext
from django.template import RequestContext # ... def detail(request, poll_id): p = get_object_or_404(Poll, pk=poll_id) return render_to_response('polls/detail.html', {'poll': p}, context_instance=RequestContext(request))
A Django template is a HTML skeleton with special Django tags which tell the Django view where to fill in data. Example template polls/index.html
{% if latest_poll_list %} <ul> {% for poll in latest_poll_list %} <li><a href="/polls/{{ poll.id }}/">{{ poll.question }}</a></li> {% endfor %} </ul> {% else %} <p>No polls are available.</p> {% endif %}
Register apps with Django’s admin interface
from polls.models import Poll from django.contrib import admin class PollAdmin(admin.ModelAdmin): fields = ['pub_date', 'question'] admin.site.register(Poll, PollAdmin)
There’s generic views which means that you don’t have to write a view function; you use django.views.generic to generate a simple view.
from django.conf.urls.defaults import patterns, include, url from django.views.generic import DetailView, ListView from polls.models import Poll urlpatterns = patterns('', (r'^$', ListView.as_view( queryset=Poll.objects.order_by('-pub_date')[:5], context_object_name='latest_poll_list', template_name='polls/index.html')), (r'^(?P <pk>\d+)/$', DetailView.as_view( model=Poll, template_name='polls/detail.html')), url(r'^(?P <pk>\d+)/results/$', DetailView.as_view( model=Poll, template_name='polls/results.html'), name='poll_results'), (r'^(?P <poll_id>\d+)/vote/$', 'polls.views.vote'), )
July 20th, 2011 § 3 comments § permalink
Here’s some notes for installing Mezzanine on Dreamhost using virtualenv. This can be useful for installing on any server where you don’t have permissions to install python packages normally. There’s also notes here for how to set up Passenger to serve your site via Apache.
In Dreamhost panel, setup site for use with Passenger & ssh
Ssh into your Dreamhost server
Setup a Python virtualenv so you can install your own Python packages. Check the virtualenv pypi page for the latest virtualenv version (currently 1.6.3).
wget http://pypi.python.org/packages/source/v/virtualenv/virtualenv-1.6.3.tar.gz tar xzf virtualenv-1.6.3.tar.gz python virtualenv-1.6.3/virtualenv.py $HOME/local rm -rf virtualenv* export PATH=$HOME/local/bin:$PATH
You probably want to add $HOME/local/bin to your path permanently. Add the export line to your ~/.bashrc file:
export PATH=$HOME/local/bin:$PATH
To make sure that you are using the virtualenv python, check that which python returns /home/youruser/local/bin/python and NOT /usr/bin/python.
Now you can install some Python packages
pip install --upgrade django mezzanine south paste
Create a mezzanine project
cd ~/site.com # Name this project whatever you like. I will use "mez" mezzanine-project mez
Edit your settings in mez/local_settings.py. I will leave the sqlite database for testing. You could should probably create a mysql database for a real site though. Add these lines so Django knows where files are.
TIME_ZONE = 'America/Los_Angeles' APP_URL = 'http://site.com' ## Note the leading and trailing slash here #ADMIN_MEDIA_PREFIX = '/admin_media/' #MEDIA_ROOT= '/home/youruser/site.com/mez/site_media/' #MEDIA_URL = 'http://site.com/site_media'
Setup your site with Passenger by creating a ~/site.com/passenger_wsgi.py file with the following:
import sys,os # Force Passenger to run our virtualenv python INTERP = "/home/youruser/local/bin/python" if sys.executable != INTERP: os.execl(INTERP, INTERP, *sys.argv) # Setup paths and environment variables sys.path.append("/home/youruser/site.com") sys.path.append("/home/youruser/site.com/mez") os.environ['DJANGO_SETTINGS_MODULE'] = 'mez.settings' # Set the application import django.core.handlers.wsgi from paste.exceptions.errormiddleware import ErrorMiddleware application = django.core.handlers.wsgi.WSGIHandler() # Use paste to display errors application = ErrorMiddleware(application, debug=True)
Now setup the static files
ln -s ~/site.com/mez/site_media ~/site.com/public/site_media
Setup the database
cd ~/site.com/mez python manage.py syncdb # I think I initially had some errors running migrate, # but it worked the second time running migrate python manage.py migrate
Restart the web server. Ordinarily you might do sudo /etc/init.d/apache2 restart. On Dreamhost you do this by touching tmp/restart.txt. (If the tmp directory doesn’t exist, mkdir ~/site.com/tmp)
touch ~/site.com/tmp/restart.txt
That should be it. Check to see if your site is up and running.
TODO’s: setup mysql, customize theme, etc
There’s alternative ways to handle the static files. The package django-staticfiles might be better? I haven’t tried it.
June 4th, 2011 § 0 comments § permalink
A few notes from my experience installing Gitorious on Ubuntu Maverick 10.10. I used soundmaster’s fork of the gitorious-ubuntu-sprinkle script. I used ruby 1.8 and rubygems from the Ubuntu repository.
The sprinkle readme doesn’t mention it, but you need to edit the config files before running. Add your mysql password to config/database.yml and change your hostname and email in config/gitorious.yml.
Beware that if the script already installed the files to /var/www/gitorious/config it won’t overwrite the existing files, so you will need to make your changes to the files at /var/www/gitorious/config (or delete the files and re-run the sprinkle script).
The sprinkle script will
I had a bunch of problems running
bundle exec sprinkle -s gitorious.rb
Ruby/capistrano spits out some long error messages, which you have to decipher to figure out which line in gitorious.rb failed to run.
Bundle couldn’t install the latest version of echoe (0.4.6) because Ubuntu’s rubygems (1.3.7) isn’t recent enough, so I installed an older version of echoe.
sudo gem install echoe -v="0.4.5"
I then removed echoe from the list of gitorious_dependencies in gitorious.rb. In hindsight, I think I could have added an entry to Gemfile specifying the echoe version, but I’m a Ruby noob, and just hacked the script to get it to work.
Then Rake couldn’t setup my database (some error about having activated rake 1.9.1 but the script required rake 1.8.7). Turns out I need to call bundle exec rake instead of /var/lib/gems/1.8/bin/rake. I modified the lines in gitorious.rb:
#post :install, 'su - git -c "/var/lib/gems/1.8/bin/rake db:setup RAILS_ENV=production"' post :install, 'su - git -c "bundle exec rake db:setup RAILS_ENV=production"'
Make sure your server is getting ports 80 and 443 (for ssl).
I also had to set up my server to properly route email so that Gitorious could send emails (e.g. registration confirmation). I used this guide to setup postfix to route mail through Gmail’s smtp.
March 27th, 2011 § 0 comments § permalink
I wish there was an Android Garmin Nuvi. C’mon Google!
February 17th, 2011 § 0 comments § permalink
Compiling applications from source may be the MO in Linux, but it is really tedious in Windows. This is not for the faint of heart.
February 17th, 2011 § 0 comments § permalink
Simplify python string formatting using locals() or vars(). In python 2 style print keyword usage. Use print( string ) for python 3k.
name = 'moose' adjective = 'squishy' print '{name} is {adjective}'.format(**locals()) # moose is squishy # vars() with no args is same as locals() print '{name} is {adjective}'.format(**vars()) # moose is squishy
Using vars to access object properties
class Cat: def __init__(self, name, adj): self.name = name self.adjective = adj kitty = Cat('Garfield', 'hungry') print '{name} is {adjective}'.format(**vars(kitty)) # Garfield is hungry
Now do some hacks to get rid of that .format(**locals())
import inspect def printhack(s): caller = inspect.currentframe().f_back print s.format(**caller.f_locals) applecolor = 'red' printhack('apples are {applecolor}') # apples are red def dbgvar(varname): caller = inspect.currentframe().f_back print 'variable "{varname}" is {value}'.format(varname=varname, value=caller.f_locals[varname]) duck = 'soup' dbgvar('duck') # variable "duck" is soup
February 17th, 2011 § 0 comments § permalink
I’m sick of all the python fangeeks always using the argument that “explicit is better than implicit” to justify python behaviors. I think it’s a good design principle to consider, but it is not a overarching commandment that good code should always be explicit. Convenience and readability is sometimes better than explicit. Use your brain, don’t be a eibti zombie.
February 17th, 2011 § 0 comments § permalink
Thanks stack overflow
from setuptools.command import easy_install easy_install.main( ["-U","py2app"] )
February 4th, 2011 § 1 comment § permalink
Redmine is a project management software. There’s existing documentation on the web about installing Redmine on Ubuntu, but much of it is out of date and confusing. Redmine is in the Ubuntu repos now so the installation is really quite simple.
sudo tasksel install lamp-server sudo apt-get install redmine
Select sqlite for the database (redmine-sqlite is installed as a dependency by apt-get and it’s simpler to setup than mysql).
Now to configure the Apache bits.
sudo ln -s /usr/share/redmine/public /var/www/redmine sudo apt-get install libapache2-mod-passenger sudo vim /etc/apache2/mods-available/passenger.conf
Add the PassengerDefaultUser www-data line to /etc/apache2/mods-available/passenger.conf. It should look like this:
<IfModule mod_passenger.c> PassengerDefaultUser www-data PassengerRoot /usr PassengerRuby /usr/bin/ruby </IfModule>
Configure apache by adding these lines to /etc/apache2/sites-available/default
<Directory /var/www/redmine> RailsBaseURI /redmine PassengerResolveSymlinksInDocumentRoot on </Directory>
Configure email
cd /etc/redmine/default sudo cp /usr/share/redmine/config/email.yml.example email.yml sudo vim email.yml
If you want to use gmail, delete the default settings and uncomment the gmail section settings. Add the line
enable_starttls_auto: trueafter the tls: true line. (see Redmine Email Config for more info.)
Restart Apache (you will have to restart Apache after you make any redmine config file changes)
sudo service apache2 restartNow see if your install worked. Try http://localhost/redmine or http://server.com/redmine. Login with username admin and password admin.
Update: Until Ubuntu updates to Redmine 1.0.4 (currently it installs 1.0.0), there is a bug where dates get displayed as {{count}} if you have the Ruby gem i18 v0.5.0 installed instead of v0.4.2. Quick fix:
sudo gem install i18n -v=0.4.2 sudo gem uninstall i18n -v=0.5.0
February 1st, 2011 § 0 comments § permalink
A quick note on defining getters and setters using decorators for Python 2.6+
#Must inherit from object #class C: won't work. class C(object): # Define getter for x #@x.getter doesn't work because self.x is not defined yet :( @property def x(self): return self._x # Define setter for x @x.setter def x(self, value): self._x = value # Define deleter for x @x.deleter def x(self): del self._x class D(C): @C.x.getter def x(self): return self._x * 2 @x.setter def x(self, value): self._x = value / 2
code stolen from the What’s new in 2.6 doc
Editorializing: I don’t like the asymmetry of defining the getter and the setter. It would be better if @x.getter would work for the setter instead of using @property for the getter. But I guess it’s better than using x=property(x_getter, x_setter). Work on it, Guido.
February 1st, 2011 § 10 comments § permalink
*Feb 3, 2011: This is a work in progress...
*Todo: nautilus integration not working - missing dependencies? (no ubuntu python-nautilus-dev package?)
*Todo: compile a release build instead of a debug build?
*Todo: build a ubuntu/debian package?
SparkleShare is dropbox-like software that can sync to your own private server. The SparkleShare documentation recommends syncing to GitHub or Gitorius, but all you need is a server with ssh and git. By using your own private server, your files won’t be publicly viewable and you can use as much storage space as you have on your server. Here’s how to setup SparkleShare with a private server on Ubuntu.
First setup the server. You will need to have ssh access to the server because
SparkleShare will sync to an existing git repository using ssh public key login. To setup ssh public key login (passwordless login) run this on your local box
ssh-copy-id user@server.comIf you get an error, you may need to create a ssh key first. Run ssh-keygen and create a key without a password. Then run ssh-copy-id again.
If you don’t have a server, you can test on the same machine. Just use localhost for the server address.
ssh-copy-id user@localhostNow create a git repository on your server.
#If your public key setup worked, you should #be able to login to ssh without entering a password ssh user@server.com git init --bare sparkle.git exit
Then set up SparkleShare. You will need sudo privileges for this.
# There may be more missing dependencies here sudo apt-get install git build-essential intltool mono-devel gtk-sharp2 nant python-nautilus mkdir ~/install cd ~/install git clone https://github.com/hbons/SparkleShare.git cd SparkleShare ./autogen.sh --prefix=/usr make sudo make install sparkleshare start
SparkleShare pops up a welcome dialog with some setup. Fill in user@server.com for the server and use /home/user/sparkle.git for the folder location. Then click Sync. When SparkleShare finishes syncing you should have a SparkleShare folder at ~/SparkleShare/sparkle where you can put files.
To redo the setup, stop sparkleshare sparkleshare stop then remove the sparkleshare config directory rm -rf ~/.config/sparkleshare and remove sparkleshare’s synced directory rm -rf ~/SparkleShare and restart sparkleshare sparkleshare start
To uninstall
sparkleshare stop cd ~/install/SparkleShare sudo make uninstall sudo rm -rf /usr/{lib,share/gnome/help,share}/sparkleshare rm -rf ~/SparkleShare rm -rf ~/.config/sparkleshare
January 27th, 2011 § 4 comments § permalink
It’s cool that there are so many Python modules available, but it’s kinda a pain to install them all. It’s too bad easy_install doesn’t do better dependency checking. It just errors out when there’s something missing.
I couldn’t get numpy to work with the 64 bit version of Python 2.7 for Windows, so I uninstalled the 64 bit version and installed the 32 bit Python. Now I need Cython, but Cython gives me some vcvarsall.bat error. The Cython FAQ mentions some this vcvarsall error, but none of the workarounds there work. (Interestingly, the patch they have seems to have been applied twice to pyxbuild.py.) Getting desperate, I tried installing ActivePython, but it gets stuck on “determining disk space requirements” forever. =P
The trick to installing ActivePython is invoking the installer from a command prompt using msiexec. Set the INSTALLDIR property if you want to change the directory that ActivePython is installed to (default is C:\python27)
msiexec /package ActivePython-2.7.1.3-win64-x64.msi INSTALLDIR="C:\activepython27" /qr
I used the ORCA MSI Editor to find the INSTALLDIR property. Thanks to Harold van de Kamp’s blog for the info on using msiexec.
January 21st, 2011 § 2 comments § permalink
Make Vim more IDE-like by assigning F5 to save and run your current script. Just add this to your ~/.vimrc
map <F5> <Esc>:w<CR>:!%:p<CR>
This maps the F5 key to run two things: :w, which saves your file, and :!%:p, which will run your current script (! runs a shell command and %:p expands to the path of your current file).
A test example
echo "#!/bin/bash" > test.sh echo "echo hello world" >> test.sh chmod +x test.sh vim test.sh
Now pressing F5 while in Vim will save test.sh and run the file in Vim’s internal shell. Just press enter when the script is done to return to Vim.
code based on discussion at stackoverflow
January 21st, 2011 § 0 comments § permalink
Simple Python snippet which creates a directory if it doesn’t exist.
#! /usr/bin/env python import os # create directory "mydir" if it doesn't exist already os.path.exists("mydir") or os.mkdir("mydir")