问Django上下文处理器没有Django的其余部分？

EN

from django.template import Template, Context, Engine

template_content = """ -- HEADER ---
{{ var|star_wrap }}
{% fullpath "filename_123.txt" %}
{{ abc }}
 -- FOOTER ---"""

data = {'var': 'Ricardo'}

engine = Engine(
    debug=True,
    builtins=['filters'],
    context_processors=(
        'context_processors.my_context_processor'
    )
)    
template = Template(
    template_content,
    engine=engine,
)
context = Context(data)    
result = template.render(context)

from django import template

# --- Filters
register = template.Library()  # pylint: disable=C0103

@register.filter(name='star_wrap')
def star_wrap(value):
    return "** " + value + " **"

@register.simple_tag(takes_context=True)
def fullpath(context, arg):
    print(context)
    return "/tmp/"+str(arg)

def my_context_processor(request):
    return {'abc': 'def'}

[{'False': False, 'None': None, 'True': True}, {'var': 'Ricardo'}]
 -- HEADER ---
** Ricardo **
/tmp/filename_123.txt

 -- FOOTER ---