client = MongoClient("mongodb://username:mypassword@localhost/mydatabase-1")
db = client['mydatabase-1']

connection = MongoClient('localhost', 27017)
db = connection['mydatabase-1']
db.authenticate('username', 'mypassword')

uri = "mongodb://username:mypassword.@localhost.com/mydatabase-1"
client = MongoClient(uri)

ConfigurationError: command SON([('authenticate', 1), ('user', u'CEI'), ('nonce', u'950483ef6634f14'), ('key', u'76f0102585a7571d96dace50d7aca5a6')]) failed: auth failed