slugify.py

import re
import unicodedata
def slugify(value):
    """
    Convert spaces to hyphens., remove characters that aren't alphanumerics, underscores, or hyphens.
    Convert to lowercase. Also strip leading and trailing whitespace.
    From Django's filter: https://github.com/django/django/blob/60586dd7379b295b72d8af4e03423c286913b5e8/django/utils/text.py#L415
    """
    value = unicodedata.normalize('NFKD', value).encode('ascii', 'ignore').decode('ascii')
    value = re.sub('[^\w\s-]', '', value).strip().lower()
    return re.sub('[-\s]+', '-', value)