Dictionary multi dimension support

[buran]

you can use dict.setdefault() method

d = {}
d.setdefault('key1', {})['key2'] = 'foo'
print(d)
d.setdefault('key1', {})['key3'] = 'bar'
print(d)

Output:
{'key1': {'key2': 'foo'}}
{'key1': {'key3': 'bar', 'key2': 'foo'}}

another option is to use defaultdict from collections

from collections import defaultdict
d = defaultdict(dict)
d['key1']['key2'] = 'foo'
print(d)
d['key1']['key3'] = 'bar'
print(d)

Output:
defaultdict(<class 'dict'>, {'key1': {'key2': 'foo'}})
defaultdict(<class 'dict'>, {'key1': {'key2': 'foo', 'key3': 'bar'}})