在AWS灾难恢复方案中，可以使用以下代码示例来获取NAT网关的IP地址：

import boto3

def get_nat_gateway_ip(region, nat_gateway_id):
    ec2_client = boto3.client('ec2', region_name=region)
    
    response = ec2_client.describe_nat_gateways(NatGatewayIds=[nat_gateway_id])
    
    if 'NatGateways' in response:
        nat_gateway = response['NatGateways'][0]
        nat_gateway_ip = nat_gateway['NatGatewayAddresses'][0]['PublicIp']
        return nat_gateway_ip
    else:
        return None

# 示例用法
nat_gateway_id = 'nat-1234567890abcdef0'
region = 'us-west-2'

nat_gateway_ip = get_nat_gateway_ip(region, nat_gateway_id)
if nat_gateway_ip:
    print(f"NAT Gateway IP address: {nat_gateway_ip}")
else:
    print("NAT Gateway not found.")

上述代码使用Boto3 Python库来管理AWS资源。通过调用describe_nat_gateways方法，可以获取指定NAT网关的详细信息，包括其IP地址。然后，通过访问JSON响应中的NatGatewayAddresses字段，可以获取NAT网关的公共IP地址。

请注意，您需要先安装和配置Boto3库，并确保给定的nat_gateway_id和region参数与目标NAT网关的ID和所在的AWS区域相匹配。