Instantiate a connection to the InfluxDB.

def main(host='localhost', port=8086):
    """Instantiate a connection to the InfluxDB."""
    user = 'root'
    password = 'root'
    dbname = 'example'
    dbuser = 'smly'
    dbuser_password = 'my_secret_password'
    query = 'select Float_value from cpu_load_short;'
    query_where = 'select Int_value from cpu_load_short where host=$host;'
    bind_params = {'host': 'server01'}
    json_body = [
        {
            "measurement": "cpu_load_short",
            "tags": {
                "host": "server01",
                "region": "us-west"
            },
            "time": "2009-11-10T23:00:00Z",
            "fields": {
                "Float_value": 0.64,
                "Int_value": 3,
                "String_value": "Text",
                "Bool_value": True
            }
        }
    ]

    client = InfluxDBClient(host, port, user, password, dbname)

    print("Create database: " + dbname)
    client.create_database(dbname)

    print("Create a retention policy")
    client.create_retention_policy('awesome_policy', '3d', 3, default=True)

    print("Switch user: " + dbuser)
    client.switch_user(dbuser, dbuser_password)

    print("Write points: {0}".format(json_body))
    client.write_points(json_body)

    print("Querying data: " + query)
    result = client.query(query)

    print("Result: {0}".format(result))

    print("Querying data: " + query_where)
    result = client.query(query_where, bind_params=bind_params)

    print("Result: {0}".format(result))

    print("Switch user: " + user)
    client.switch_user(user, password)

    print("Drop database: " + dbname)
    client.drop_database(dbname)