class AttributeTags(db.model):
	tags = db.StringListProperty()

Say for instance you would like to create a data object which needs dynamic properties that are easily searchable – for example real estate.

Tags could be such:

a = AttributeTags(tags=['000_3_bedroom', '001_2_bathroom', '002_1_garage'])
a.put()
b = AttributeTags(tags=['000_5_bedroom', '001_4_bathroom', '002_3_garage'])
b.put()
c = AttributeTags(tags=['000_4_bedroom', '001_3_bathroom', '002_3_garage'])
c.put()

SELECT __keys__ FROM AttributeTags WHERE tags >= '000_3' AND tags < '000_4'


import cgi
string = str('I hate monkey & hyena characters')
cgi.escape(string)


Should print out:

I hate monkey & hyena characters


self.response.headers['Content-Type'] = "application/xml"


Full example:


class MainPage(webapp.RequestHandler):
def get(self):
greetings_query = databasemodel.all()

template_values = {
'greetings': greetings_query
}
self.response.headers['Content-Type'] = "application/xml"
path = os.path.join(os.path.dirname(__file__), 'templates/index.xml')
self.response.out.write(template.render(path, template_values))



server {
listen 80;
server_name yourhotdomain.com;
access_log logs/yourhotdomain.access.log;
location / {
proxy_pass http://localhost:8080;
}
}


If you want to change the datastore location do this:


sudo ./dev_appserver.py helloworld/
ctrl c
cp /tmp/dev_appserver.datastore /some_new_path/dev_appserver.datastore
sudo ./dev_appserver.py --datastore_path=/some_new_path/dev_appserver.datastore helloworld/


Your App Engine app should now be running on ‘yourhotdomain.com’.

If you want to run it on your local computer just change your /etc/hosts file to include ‘yourhotdomain.com’


127.0.0.1 yourhotdomain.com yourhotdomain.com


Great for getting geocodes.

• Create multiple user accounts to send mail. For example, ‘Campus Admin1′ and ‘Campus Admin2′ can each send 500 messages to reach 1000 unique recipients.
• Stagger mass communications over the course of two days. For example, send messages to 500 recipients on day one, wait for 24 hours, and send messages to another 500 recipients on day two.

One wonders how this would work in practice given the 2nd suggestion. It seems that at the moment Google Apps is only suitable for small businesses.

svn import /home/myfiles/source file:///home/svn/myrepository -m “initial import”

The first directory after ‘import’ are where all your code are. file:/// is where the repository will be located.

Here is a handy tutorial.

Starting an svnserve daemon:

svnserve -d –listen-port=xxxx -r /home/svn/repository

Now test it out with a list:

svn ls svn://yy.yyy.yy.yy:xxxx
(where yy is your ip address xx is your port.)

Feedjack is a Django based Feed Aggregator.

The next step is to use the Google Maps suggestions mechanism.

Here’s an article over at high scalability which attempts to explain the difference between BigTable and MySQL.

If you’re looking for a simple tutorial on ER Entity Relationship Models check out this post.