AWS Shield标准提供一些基本保护层，但如果您需要更强大的防御措施，您应该考虑AWS Shield高级版。AWS Shield高级版提供了更丰富的功能，例如DDoS攻击侦测与缓解、实时可视化威胁情报、AWS WAF、AWS Firewall Manager等。

以下是使用AWS WAF和AWS Shield高级版的示例代码，以阻止来自指定IP地址的DDoS攻击：

import boto3

# create a new AWS WAF client
waf = boto3.client('waf')

# create a new IPSet object and specify the IP addresses to block
ip_set = waf.create_ip_set(
    Name='ddos_blocked_ips',
    ChangeToken=waf.get_change_token()['ChangeToken'],
    IPAddressSet={
        'IPAddresses': [
            '1.2.3.4',
            '5.6.7.8'
        ]
    }
)

# create a new AWS WAF rule
rule = waf.create_rule(
    Name='ddos_blocking_rule',
    ChangeToken=waf.get_change_token()['ChangeToken'],
    MetricName='ddos_blocking_metric',
    Predicates=[
        {
            'Negated': False,
            'Type': 'IPMatch',
            'DataId': ip_set['IPSet']['IPSetId'],
        }
    ]
)

# create a new AWS WAF web ACL and associate it with the new rule
web_acl = waf.create_web_acl(
    Name='ddos_blocking_acl',
    ChangeToken=waf.get_change_token()['ChangeToken'],
    DefaultAction={
        'Type': 'ALLOW'
    },
    MetricName='ddos_blocking_metric',
    Rules=[
        {
            'Action': {
                'Type': 'BLOCK'
            },
            'Priority': 1,
            'RuleId': rule['Rule']['RuleId'],
            'Type': 'REGULAR'
        }
    ]
)

# enable AWS Shield Advanced protection on the AWS resource to be protected
shield = boto3.client('shield')
response = shield.create_protection(
    Name='ddos_protection',
    ResourceArn='arn:aws:ec2:us-west-2:123456789012:instance/i-0123456789abcdef',
)

# associate the new AWS WAF web ACL with the AWS Shield Advanced protection
response = shield.associate_web_acl(
    WebACLId=web_acl['WebACL']['WebACLId'],
    ProtectionId=response['Protection']['Id'],
)

以上代码创建了一个AWS WAF规则，