code: def main(host='localhost', port=8086):
      
      user = 'root'
      password = 'root'
      dbname = 'demo'
      protocol = 'json'
  
      client = DataFrameClient(host, port, user, password, dbname)
  
      print("Create pandas DataFrame")
      df = pd.DataFrame(data=list(range(30)),
                        index=pd.date_range(start='2014-11-16',
                                            periods=30, freq='H'), columns=['0'])
  
      print("Create database: " + dbname)
      client.create_database(dbname)
  
      print("Write DataFrame")
      client.write_points(df, 'demo', protocol=protocol)
  
      print("Write DataFrame with Tags")
      client.write_points(df, 'demo',
                          {'k1': 'v1', 'k2': 'v2'}, protocol=protocol)
  
      print("Read DataFrame")
      client.query("select * from demo")
  
      print("Delete database: " + dbname)
      client.drop_database(dbname)
docs: Instantiate the connection to the InfluxDB client.