Fixed #21639 -- Implemented RenderContext.__getitem__

        return key in self.dicts[-1]

    def get(self, key, otherwise=None):

        d = self.dicts[-1]

        if key in d:

            return d[key]

        return otherwise

        return self.dicts[-1].get(key, otherwise)

    def __getitem__(self, key):

        return self.dicts[-1][key]

# This is a function rather than module-level procedural code because we only

# want it to execute if somebody uses RequestContext.

from unittest import TestCase

from django.template import Context, Variable, VariableDoesNotExist

from django.template.context import RenderContext

class ContextTests(TestCase):

        self.assertRaises(VariableDoesNotExist,

                Variable('new').resolve, empty_context)

        self.assertEqual(Variable('new').resolve(Context({'new': 'foo'})), 'foo')

    def test_render_context(self):

        test_context = RenderContext({'fruit': 'papaya'})

        # Test that push() limits access to the topmost dict

        test_context.push()

        test_context['vegetable'] = 'artichoke'

        self.assertEqual(list(test_context), ['vegetable'])

        self.assertNotIn('fruit', test_context)

        with self.assertRaises(KeyError):

            test_context['fruit']

        self.assertIsNone(test_context.get('fruit'))