在python3和示例代码中使用boto3访问亚马逊EC2信息时出错

import boto3

# 创建EC2客户端
ec2_client = boto3.client('ec2', region_name='us-west-2')

# 获取所有EC2实例
response = ec2_client.describe_instances()

# 打印实例信息
for reservation in response['Reservations']:
    for instance in reservation['Instances']:
        print("实例ID: " + instance['InstanceId'])
        print("实例类型: " + instance['InstanceType'])
        print("状态: " + instance['State']['Name'])
        print("公有IP地址: " + instance['PublicIpAddress'])
        print("私有IP地址: " + instance['PrivateIpAddress'])
        print("--------------------")