          first, lang, priority = pieces[i:i + 3]
          if first:
              return []
          if priority:
              try:
                  priority = float(priority)
              except ValueError:
                  return []
          if not priority:        # if priority is 0.0 at this point make it 1.0
              priority = 1.0
          result.append((lang, priority))
      result.sort(key=lambda k: k[1], reverse=True)
      return result
 
</s> remove         (?:\s*;\s*q=(0(?:\.\d{,3})?|1(?:.0{,3})?))?   # Optional "q=1.00", "q=0.8"
 </s> add         (?:\s*;\s*q=(0(?:\.\d{,3})?|1(?:\.0{,3})?))?  # Optional "q=1.00", "q=0.8" </s> remove         self.assertEqual([], p('en; q=1,'))
 </s> add         self.assertEqual([], p('en;q=1e0'))
            priority = float(priority)
          first, lang, priority = pieces[i:i + 3]
          if first:
              return []
          if priority:
            priority = float(priority)
            priority = float(priority)
            priority = float(priority)
            priority = float(priority)
          if not priority:        # if priority is 0.0 at this point make it 1.0
              priority = 1.0
          result.append((lang, priority))
      result.sort(key=lambda k: k[1], reverse=True)
      return result
keep keep keep keep replace replace replace replace keep keep keep keep keep
 Fixed #26744 -- Fixed a typo in regex for Accept-Language header parsing. 
django/utils/translation/trans_real.py