from functools import reduce
filters.append(Q(is_default=False))
if cut:
    filters.append(Q(mailbagstats__num_letters2__gt=int(cut)))
filters.pop()
filters_for_query = reduce(lambda a, x: a & x, filters, filters.pop())
Model.objects.filter(filters_for_query)
Извлечь запрос из запроса django Q?