晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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# -*- coding: utf-8 -*-
"""
    djangojinja2
    ~~~~~~~~~~~~

    Adds support for Jinja2 to Django.

    Configuration variables:

    ======================= =============================================
    Key                     Description
    ======================= =============================================
    `JINJA2_TEMPLATE_DIRS`  List of template folders
    `JINJA2_EXTENSIONS`     List of Jinja2 extensions to use
    `JINJA2_CACHE_SIZE`     The size of the Jinja2 template cache.
    ======================= =============================================

    :copyright: (c) 2009 by the Jinja Team.
    :license: BSD.
"""
from itertools import chain
from django.conf import settings
from django.http import HttpResponse
from django.core.exceptions import ImproperlyConfigured
from django.template.context import get_standard_processors
from django.template import TemplateDoesNotExist
from jinja2 import Environment, FileSystemLoader, TemplateNotFound
from jinja2.defaults import DEFAULT_NAMESPACE


# the environment is unconfigured until the first template is loaded.
_jinja_env = None


def get_env():
    """Get the Jinja2 env and initialize it if necessary."""
    global _jinja_env
    if _jinja_env is None:
        _jinja_env = create_env()
    return _jinja_env


def create_env():
    """Create a new Jinja2 environment."""
    searchpath = list(settings.JINJA2_TEMPLATE_DIRS)
    return Environment(loader=FileSystemLoader(searchpath),
                       auto_reload=settings.TEMPLATE_DEBUG,
                       cache_size=getattr(settings, 'JINJA2_CACHE_SIZE', 400),
                       extensions=getattr(settings, 'JINJA2_EXTENSIONS', ()))


def get_template(template_name, globals=None):
    """Load a template."""
    try:
        return get_env().get_template(template_name, globals=globals)
    except TemplateNotFound, e:
        raise TemplateDoesNotExist(str(e))


def select_template(templates, globals=None):
    """Try to load one of the given templates."""
    env = get_env()
    for template in templates:
        try:
            return env.get_template(template, globals=globals)
        except TemplateNotFound:
            continue
    raise TemplateDoesNotExist(', '.join(templates))


def render_to_string(template_name, context=None, request=None,
                     processors=None):
    """Render a template into a string."""
    context = dict(context or {})
    if request is not None:
        context['request'] = request
        for processor in chain(get_standard_processors(), processors or ()):
            context.update(processor(request))
    return get_template(template_name).render(context)


def render_to_response(template_name, context=None, request=None,
                       processors=None, mimetype=None):
    """Render a template into a response object."""
    return HttpResponse(render_to_string(template_name, context, request,
                                         processors), mimetype=mimetype)

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