Example more pythonic for event hubs load balancer

example.py

import collections

partition_ids = range(1, 7)
ownerships = [
    {
        'last_modified_time': 7,
        'partition_id': 1,
        'ownership': 1
    },
    {
        'last_modified_time': 7,
        'partition_id': 1,
        'ownership': 1
    },
    {
        'last_modified_time': 3,
        'partition_id': 2,
        'ownership': 1
    },
    {
        'last_modified_time': 4,
        'partition_id': 3,
        'ownership': 2
    },
    {
        'last_modified_time': 7,
        'partition_id': 4,
        'ownership': 2
    },
    {
        'last_modified_time': 5,
        'partition_id': 5,
        'ownership': 3
    },
    {
        'last_modified_time': 2,
        'partition_id': 6,
        'ownership': 5
    },
]

by_owner = collections.defaultdict(list)
for o in ownerships: 
    by_owner[o['ownership']].append(o)

not_owned = [pid for pid in partition_ids if pid not in by_owner]
timed_out = [ownership for ownership in ownersips if ownership['last_modified_time' < 6]]

print(by_owner)
print(not_owned)