无法连接到本地主机数据库（5432端口）

Question

问题是我无法连接到本地主机数据库（5432端口），在此Postgresql上我确实很绿，但我仍然不了解这些数据库及其工作方式。我的连接代码：

import psycopg2
try:
    connection = psycopg2.connect(user = "sysadmin",
                                  password = "pynative@#29",
                                  host = "127.0.0.1",
                                  port = "5432",
                                  database = "postgres_db")
    cursor = connection.cursor()
    # Print PostgreSQL Connection properties
    print ( connection.get_dsn_parameters(),"\n")
    # Print PostgreSQL version
    cursor.execute("SELECT version();")
    record = cursor.fetchone()
    print("You are connected to - ", record,"\n")
except (Exception, psycopg2.Error) as error :
    print ("Error while connecting to PostgreSQL", error)
finally:
    #closing database connection.
        if(connection):
            cursor.close()
            connection.close()
            print("PostgreSQL connection is closed")

我还在本地主机rooter上做了一些端口转发。

Port Forwarding photo

据我所知，我将“ nmap”软件用于正在运行的端口吗？我得到的结果在这里NMAP