filter_sort_on_areas

import itertools

# must be zero-based
CATEGORIES_ORDER = {
    "SSSI": 0,
    "SAC": 1,
    "SPA": 2,
    "RAMSAR": 3,
    "GCR": 4,
    "LNR": 5,
    "CNTRYPK": 6
}

category_key = lambda area: area["category"]

sorted_grouped_areas = []

tmp_areas = [
  (key, list(group))
  for key, group in itertools.groupby(sorted(xx, key=category_key), key=category_key)
]
tmp_areas.sort(key=lambda grouped_area: CATEGORIES.get(grouped_area[0], len(CATEGORIES)))
for key, group in tmp_areas:
   sorted_grouped_areas += group

#for key, group in itertools.groupby(sorted(processed_data["areas"], key=category_key), key=category_key):
#  sorted_areas.insert(CATEGORIES_ORDER.get(key, len(sorted_areas)), list(group))
#sorted_areas = itertools.chain.from_iterable(sorted_areas)