Python 2.7 Addition to dict is too slow

[Gribouillis]

Is this way faster?

from collections import defaultdict
struct = defaultdict(lambda: defaultdict(int))
struct['foo']['bar'] += 7
print(struct)

The following version probably works for every version of python since 1.0

def addBytesToStatStruct(struct, subscriberId, protocolId, octents):
    try:
        d = struct[subscriberId]
    except KeyError:
        struct[subscriberId] = {protocolId: octents}
        return
    try:
        d[protocolId] += octents
    except KeyError:
        d[protocolId] = octents

Other solutions involve setdefault() and get() as buran said.