向dict添加键会导致TypeError:“str”对象不支持项分配

Question

我正在尝试用我自己的变量编辑YAML文件

这是我正在编辑的YAML模板：

Mappings:
  PrivateLink:
    EndPointService:
      EndPointService: hostname1
      PrincipalName: ""
  NLBName:
    NLBName:
      Name: hostname1
  TargetName:
    hostname1-22:
      Name: hostname1-22
      VpcId: vpc-123
      Id: "i-123"

我的目标是循环列出我拥有的端口号，并使用它们创建新的目标组

例如，如果我的端口列表为[22, 80, 443]，则输出YAML如下所示：

Mappings:
  PrivateLink:
    EndPointService:
      EndPointService: hostname1
      PrincipalName: ""
  NLBName:
    NLBName:
      Name: hostname1
  TargetName:
    #Editing is done here
    hostname1-22:
      Name: hostname1-22
      VpcId: vpc-123
      Id: "i-123"
    hostname1-80:
      Name: hostname1-80
      VpcId: vpc-123
      Id: "i-123"
    hostname1-443:
      Name: hostname1-443
      VpcId: vpc-123
      Id: "i-123"

对于我的函数，如下所示：

def editEndpointServiceTemplate(endpoint_service_template_path):
    yaml = YAML()
    yaml.indent(mapping=3)
    ports_list = ast.literal_eval(configParser.get("Ports", "Ports"))

    #Load yaml file
    with open(endpoint_service_template_path) as fp:
        data = yaml.load(fp)
    
    for i in range(0, len(ports_list)):
        tg_name = service_name + "-" + str(ports_list[i])
        data['Mappings']['TargetName'][tg_name] = None
        data['Mappings']['TargetName'][tg_name]['Name'] = "test"

    
    #Write new yaml file
    with open(endpoint_service_template_path, 'w') as fp:
        yaml.dump(data, fp)

我在这个错误上失败了：

data['Mappings']['TargetName'][tg_name]['Name'] = "test"
TypeError: 'str' object does not support item assignment

我想我无法访问我刚刚创建的密钥，但我不知道如何修复它

Answer 1

通过更改来修复它：

data['Mappings']['TargetName'][tg_name] = None

为此：

data['Mappings']['TargetName'][tg_name] = {}

现在已经修好了。我想我必须把它设为dict对象