如何从pygresql中捕获特定的异常？

import pgdb

conn = pgdb.connect(database="your_database", user="your_username", password="your_password", host="your_host", port="your_port")

cursor = conn.cursor()

try:
    # 执行数据库操作
    cursor.execute("your_query")
    # 其他操作...
except pgdb.DatabaseError as e:
    # 捕获特定的异常
    if isinstance(e, pgdb.IntegrityError):
        # 处理特定的完整性约束异常
        print("IntegrityError: ", e)
    elif isinstance(e, pgdb.ProgrammingError):
        # 处理特定的编程错误异常
        print("ProgrammingError: ", e)
    else:
        # 处理其他异常
        print("DatabaseError: ", e)