Change Default Linux Shell

Needs sudo privileges: to change the default shell:

chsh

http://forums.devshed.com/unix-help-35/how-to-change-default-shell-52749.html

Host a Test email server for Django header debugging

Set the following in settings.py
EMAIL_HOST="localhost"
EMAIL_PORT="1025"

Run the following to host the test webserver

python -m smtpd -n -c DebuggingServer localhost:1025

http://docs.djangoproject.com/en/dev/topics/email/ 

Django Management Commands

Django syncdb without prompts
python manage.py syncdb --noinput

http://docs.djangoproject.com/en/dev/ref/django-admin/

Bash customize autocomplete

http://www.linuxjournal.com/content/more-using-bash-complete-command

Dynamic Fieldsets in Django Admin

Problem: the fieldsets option for the admin interface (classes defined in admin.py) requires that you explicitly list every single field in the model in the fieldset list that you pass to it.  This gets tedious if you add a field to a model, as you also have to add it to this admin.py.  Not very DRY.

Solution:
In models.py
from django.db import models
class My(models.Model):
    a = models.CharField(max_length=10)
    b = models.CharField(max_length=10)
    c = models.CharField(max_length=10)
    d = models.CharField(max_length=10)
    e = models.CharField(max_length=10)
    f = models.CharField(max_length=10)
    g = models.CharField(max_length=10)
    h = models.CharField(max_length=10)

In admin.py
from django.contrib import admin
from django.forms.models import fields_for_model
from f import models
class MyAdmin(admin.ModelAdmin):
    def __init__(self, *args, **kwargs):
        super(MyAdmin, self).__init__(*args, **kwargs)
        all_fields = set(fields_for_model(models.My))
        fieldset1_fields = ('e', 'f',)
        fieldset2_fields = ('g', 'h',)
        fieldset_fields = set(fieldset1_fields) | set(fieldset2_fields)
        rest_fields = list(all_fields - fieldset_fields)
        self.fieldsets = (
            (None, {
                'fields': rest_fields
            }),
            ('Fieldset 1', {
                'classes': ('collapse',),
                'fields': fieldset1_fields
            }),
            ('Fieldset 2', {
                'classes': ('collapse',),
                'fields': fieldset2_fields
            }),
        )
    models = models.My
admin.site.register(models.My, MyAdmin)


Thanks for the help lorochka85

Drill through a Login with Python

import urllib2
import urllib
import BeautifulSoup

# build opener with HTTPCookieProcessor
o = urllib2.build_opener( urllib2.HTTPCookieProcessor() )
urllib2.install_opener( o )

# assuming the site expects 'user' and 'pass' as query params
p = urllib.urlencode( { 'username': 'myusername', 'password': 'mypassword' } )

# perform login with params
f = o.open( 'https://www.mysite.com/login', p )
data = f.read()
f.close()

# second request should automatically pass back any
# cookies received during login... thanks to the HTTPCookieProcessor
f = o.open( 'http://www.mysite.com/home/' )
data = f.read()
f.close()

soup = BeautifulSoup.BeautifulSoup(data)

http://www.nomadjourney.com/2009/03/automatic-site-login-using-python-urllib2/

Python String format

Python Format dates into strings
from datetime import date
d1 = date(2010,01,23)
d2 = date(2010,01,23)
"%s - %s" % (d1.strftime("%m / %d / %Y"), d1.strftime("%m / %d / %Y"))

Python Unicode Convert

Convert weird unicode string characters to string:
import unicodedata
unicodedata.normalize('NFKD',unicode_string).encode('ascii','ignore')

Django module for helping convert things to ascii strings:
from django.utils.encoding import smart_str
smart_str('weird string goes here')

Another hack for removing unicode errors:
unicode('my weird string', errors='ignore')


http://docs.python.org/howto/unicode.html#the-unicode-type