Instant nested dicts

AutoVivication.py

# Borrowed from:
# https://stackoverflow.com/questions/2600790/multiple-levels-of-collection-defaultdict-in-python
class AutoVivification(dict):
    """Implementation of perl's autovivification feature."""
    def __getitem__(self, item):
        try:
            return dict.__getitem__(self, item)
        except KeyError:
            value = self[item] = type(self)()
            return value


data = [('a', 'b', 'c', 'd', 1), ('e', 'f', 'g', 'h', 2)]
results = AutoVivification()
for uuid, view, cat, subcat, value in data:
    results[view][cat]['subcategories'][subcat]['uuid'] = uuid
    results[view][cat]['subcategories'][subcat]['value'] = value
print(results)
'b': {'c': {'subcategories': {'d': {'uuid': 'a', 'value': 1}}}}, 'f': {'g': {'subcategories': {'h': {'uuid': 'e', 'value': 2}}}}}