Question

我无法将以下代码的结果写入文件

import boto3
ACCESS_KEY= "XXX"
SECRET_KEY= "XXX"
regions = ['us-east-1','us-west-1','us-west-2','eu-west-1','sa-east-1','ap-southeast-1','ap-southeast-2','ap-northeast-1']
for region in regions:
  client = boto3.client('ec2',aws_access_key_id=ACCESS_KEY,aws_secret_access_key=SECRET_KEY,region_name=region,)
  addresses_dict = client.describe_addresses()
  #f = open('/root/temps','w')
  for eip_dict in addresses_dict['Addresses']:
    with open('/root/temps', 'w') as f:
      if 'PrivateIpAddress' in eip_dict:
         print eip_dict['PublicIp']
         f.write(eip_dict['PublicIp'])

这导致打印IP，但没有任何内容写入文件，打印结果为：

22.1.14.1
22.1.15.1
112.121.41.41
....

我只需要以这种格式编写内容

Answer 1

for eip_dict in addresses_dict['Addresses']:
    with open('/root/temps', 'w') as f:
      if 'PrivateIpAddress' in eip_dict:
         print eip_dict['PublicIp']
         f.write(eip_dict['PublicIp'])

您正在重新打开文件，以便在循环的每次迭代中进行写入。也许最后一次迭代在其dict中没有带有'PrivateIpAddress'的成员，因此文件被打开，截断并留空。用这种方式写它：

with open('/root/temps', 'w') as f:
    for eip_dict in addresses_dict['Addresses']:
        if 'PrivateIpAddress' in eip_dict:
            print eip_dict['PublicIp']
            f.write(eip_dict['PublicIp'])

Answer 2

以附加模式打开文件

.cgi

或在循环外声明文件

如何将列表写入文件？

2 个答案: