Jinja2 sort natural sort alphanum

filters.py

import re
from jinja2.filters import environmentfilter, make_attrgetter, ignore_case

@environmentfilter
def sort_alphanum(environment, value, reverse=False, case_sensitive=False, attribute=None):
    """
    https://blog.codinghorror.com/sorting-for-humans-natural-sort-order/

    Extended use in jinja2
    """

    key_func = make_attrgetter(
        environment, attribute,
        postprocess=ignore_case if not case_sensitive else None
    )
    convert = lambda t: int(t) if t.isdigit() else t
    alphanum_key = lambda key: [convert(c) for c in re.split('([0-9]+)', key_func(key))]
    return sorted(value, key=alphanum_key, reverse=reverse)