[python][redshift]用python获取redshift中的数据

https://www.blendo.co/blog/access-your-data-in-amazon-redshift-and-postgresql-with-python-and-r/

import psycopg2
import numpy as np
import pandas as pd
hostname=xxxxx
pw=xxxxx
con=psycopg2.connect(dbname='dynamicpop', host=hostname,port='15439', user=