Shows how to render a Django template using a custom template tag library.

django_template_custom_render.py

from django.conf import settings as s
from django.template import Parser, Lexer, Context, Library, StringOrigin

lib = Library()

def parse_template(library, origin, template_string):
    if s.TEMPLATE_DEBUG:
        from django.template.debug import DebugLexer, DebugParser
        lexer_class, parser_class = DebugLexer, DebugParser
    else:
        lexer_class, parser_class = Lexer, Parser
    lexer = lexer_class(template_string, StringOrigin(origin))
    parser = parser_class(lexer.tokenize())
    parser.add_library(library)
    return parser.parse()

@lib.filter_function
def say_hello(value):
    return "Hello, %s" %(value, )

my_template = parse_template(lib, "some_template_name", """
    {{ name|say_hello }}
""")