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class Post(models.Model):
    image = models.ImageField(
        max_length=255,
        upload_to='uploads/blog',
    )

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    def get_queryset(self):
        queryset = super(MyModel, self).get_queryset()
        states_filter = [
            item.strip()
            for item in config.STATES.split(',')
        ]
        if not states_filter:
            MyModel.objects.none()
        q = Q()
        for state in states_filter:

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$('body').on('click', '.autocomplete-light-widget .deck .remove', function() {
    // do something
});

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def swap(a, i, j):
    t = a[i]
    a[i] = a[j]
    a[j] = t

def permutations(a, i, n):
    if i == n:
        print a
    else:
       for j in range(i, n):

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import datetime
import calendar

def get_days_passed(before, after):
    d1 = before.date()
    d2 = after.date()
    return abs(d1 - d2).days

d1 = datetime.datetime(2014, 05, 24, 17, 0, 0)
d2 = datetime.datetime(2014, 05, 24, 18, 5, 0)

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# generate a new key
ssh-keygen -t rsa -b 4096 -f  ~/.ssh/my_key
# private key
cat ~/.ssh/my_key
# public key
cat ~/.ssh/my_key.pub 
# add key
ssh-add ~/.ssh/my_key

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.item-blur {
    /* blur */
    filter: blur(5px);
    -webkit-filter: blur(5px);
    -moz-filter: blur(5px);
    -o-filter: blur(5px);
    -ms-filter: blur(5px);
    filter: url(data:image/svg+xml;base64,PHN2ZyB2ZXJzaW9uPSIxLjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyI+DQoJPGZpbHRlciBpZD0iYmx1ciI+DQoJCTxmZUdhdXNzaWFuQmx1ciBzdGREZXZpYXRpb249IjMiIC8+DQoJPC9maWx0ZXI+DQo8L3N2Zz4=#blur);
    -webkit-transition: -webkit-filter .50s;
    /* prevent copy */

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class ContactForm(forms.ModelForm):

    def __init__(self, *args, **kwargs):
        super(ContactForm, self).__init__(*args, **kwargs)
        self.fields['topic'].queryset = ContactTopic.objects.filter(
            is_active=True,
        )

    class Meta:
        model = ContactMessage

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from django.forms.models import model_to_dict

instance = MyModel.objects.first()
fields = model_to_dict(instance).keys()

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class BasicAdmin(admin.ModelAdmin):
    # ...

    def get_urls(self):
        urls = super(BasicAdmin, self).get_urls()
        my_urls = patterns(
            '',
            (r'^download_as_xls/$', self.download_as_xls_view)
        )
        return my_urls + urls