Djang slugify a string to Twitter hashtag format

gistfile1.py

import re
import unicodedata

try:
    from django.utils.encoding import smart_unicode as smart_text
except ImportError:
    from django.utils.encoding import smart_text


SLUG_OK = '_'

def slug_twitter(s, ok=SLUG_OK, lower=True, spaces=False):
  """
  Slugify a string to Twitter hashtag format
  """
  
  rv = []
  for c in unicodedata.normalize('NFKC', smart_text(s)):
      cat = unicodedata.category(c)[0]
      if cat in 'LN' or c in ok:
          rv.append(c)
      if cat == 'Z': # space
        rv.append(' ')
  new = ''.join(rv).strip()
  if not spaces:
    new = re.sub('[-\s]+', '_', new)
  return new.lower() if lower else new