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$(function() {
	if (!('placeholder' in document.createElement('input'))) {
		$('input[placeholder], textarea[placeholder]').each(function() {
			var text = this.getAttribute('placeholder');
			var fld = $(this);

			function setPlaceholder() {
				if (fld.val() == text || fld.val() == '') {
					fld.addClass('jqPlaceholder');
					fld.val(text);

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class AbstractMixin(object):
    _classcache = {}

    @classmethod
    def contribute(cls):
        return {}

    @classmethod
    def construct(cls, *args, **kwargs):
        attrs = cls.contribute(*args, **kwargs)

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{% load liczba_mnoga %}

<p>{% liczba_mnoga user_count "jedna osoba" "%(n)s osoby" "%(n)s osób" %}</p>

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{% load i18n %}

{% if u.sex == 'm' %}
    {% blocktrans with u.get_full_name as male %}
        {{ male }} set up us a bomb.
    {% endblocktrans %}
{% else %}
    {% blocktrans with u.get_full_name as female %}
        {{ female }} set up us a bomb.
    {% endblocktrans %}

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class Barney(object):
    def __enter__(self):
        print 'legen...'

    def __exit__(self, exc_type, exc_value, traceback):
        print '...dary'

with Barney():
    print 'wait for it'

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"""
sqlite3 database backend with non-synchronous mode.

It gives you a huge performance boost by turning off the overzealous
synchronous operation mode. The tradeoff is less data protection in case of
power outages but come on, you were not going to use it in production, were you?
"""
from django.db.backends.sqlite3.base import (
    DatabaseWrapper as Sqlite3Wrapper,
    DatabaseError,

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from django import forms
from satchless.forms.widgets import DecimalInput
from satchless.product.forms import BaseVariantForm

from . import models

class ProductPriceForm(forms.ModelForm):
    class Meta:
        widgets = {
            'price': DecimalInput(min_decimal_places=2),

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import glob
import os
from xml.etree import ElementTree

TEMP = './tmp.svg'

def rebrand(fname, brand):
  svg = ElementTree.parse(fname)
  for e in svg.iterfind(".//{http://www.w3.org/2000/svg}rect[@id='background']"):
    e.set('style', 'fill:url(#%s);' % (brand,))

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def query_db(ids):
    print('Querying the database:', ids)
    # fake some data
    results = []
    for id_ in ids:
        results.extend(range(id_ + 2, id_ + 5))
    # simulate DISTINCT()
    return set(results)

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diff --git a/django/db/models/expressions.py b/django/db/models/expressions.py
index 4306193..bf965c1 100644
--- a/django/db/models/expressions.py
+++ b/django/db/models/expressions.py
@@ -340,11 +340,27 @@ def reverse_ordering(self):
         return self
 
 
+class ExpressionFilter(object):
+    def __init__(self, expression, value, lookup):