python连接PostgreSQL数据库的学习一

psycopg2.OperationalError: could not connect to server: Connection timed out (0x0000274C/10060)
    Is the server running on host "X.X.X.X" and accepting
    TCP/IP connections on port 5432?

这个就是无法连接啊。要不你的psql被防火墙栏下来了，要不就是你的pgsql没有启动，或者端口不对，或者主机名不对

import psycopg2

# 数据库连接参数

conn = psycopg2.connect(database="test1", user="jm", password="123", host="127.0.0.1", port="5432")

cur = conn.cursor()

cur.execute("SELECT * FROM a1;")

rows = cu