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from pymongo import MongoClient

client = MongoClient('localhost', 27017)

db = client.test
counters = db.counters

def get_next_sequence_number(name):
	counter = counters.find_and_modify(query = {'type': name}, update = {'$inc': {'value': 1}}, upsert = True, new = True)
	counter_value = counter['value']
	return counter_value

print get_next_sequence_number('uid')
print get_next_sequence_number('uids')