构建Python protobuf消息实例时，我不断收到位置参数错误。

huangapple
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英文:

When constructing an instance of a Python protobuf message, I keep getting positional argument error

问题

  1. 我正在使用pb_2，并想构建消息的实例，但一直遇到位置参数错误。我可以从所有其他消息中构建实例，但当涉及到以下示例时，我卡住了。
  3. 我有以下三条消息：
  5.     message Foo {
  6.        int32 num = 1;
  7.        repeated KeyValuePair features = 2;  
  8.     }
  9.     
  10.     message KeyValuePair {
  11.        string key = 1;
  12.        Value value = 2;
  13.     }
  15.     message Value {
  16.        oneof oneOfValue {
  17.           string strValue = 1;
  18.           int64 intValue = 2;
  19.        }
  20.     }
  22. 我想构建一个类似于以下的Foo实例：
  24.     foo {
  25.           num: 123
  26.           features: [KeyValuePair {key: 'key1', value: 'value1'},
  27.                      KeyValuePair {key: 'key2', value: 'value2'}]
  28.         }
  30. 我尝试了以下方法，但一直收到位置参数错误（'不允许位置参数'）：
  32.     my_foo = Foo(num=123, 
  33.                  features=[KeyValuePair(key='key1', value='value1'),
  34.                            KeyValuePair(key='key2', value='value2')])
  36. 我没有使用任何位置参数。有人能帮忙吗？
  38. 谢谢！
英文:

I'm using pb_2 and want to consturct instances of a message but keep facing positional argument error. I can construct instances from all other messages but when it comes to the following example, I get stcuk.

I have the following three messages:

  1. message Foo {
  2.    int32 num = 1;
  3.    repeated KeyValuePair features = 2;  
  4. }
  6. message KeyValuePair {
  7.    string key = 1;
  8.    Value value = 2;
  9. }
  11. message Value {
  12.    oneof oneOfValue {
  13.       string strValue = 1;
  14.       int64 intValue = 2;
  15.    }
  16. }

I want to construct an instance of Foo that looks like this:

  1. foo {
  2.       num: 123
  3.       features: [KeyValuePair {key: 'key1', value: 'value1'},
  4.                  KeyValuePair {key: 'key2', value: 'value2'}]
  5.     }

I tried the following and keep getting positional argument error ('no positional arguments allowed'):

  1. my_foo = Foo(num=123, 
  2.              features=[KeyValuePair(key='key1', value='value1'),
  3.                        KeyValuePair(key='key2', value='value2')])

I am not using any positional arguments. Can anyone help?

Thanks!

答案1

得分: 1

你似乎错误地实例化了 Foo，请注意我对 Protocol Buffers 不太熟悉... 你已经声明了 KeyValuePair 如下：

  1. message KeyValuePair {
  2.    string key = 1;
  3.    Value value = 2;
  4. }

这意味着它将一个字符串值映射到一个 Value 实例。所以你需要这样做：

  1. my_foo = Foo(
  2.     num=123,
  3.     features=[
  4.         KeyValuePair(key="key1", value=Value(strValue="value1")),
  5.         KeyValuePair(key="key2", value=Value(strValue="value2")),
  6.     ],
  7. )

在我的系统上，使用你的示例 .proto 文件（在顶部添加 syntax = "proto3";），这将不会产生错误。

英文:

With the caveat that I am not familiar with protobuf...aren't you instantiating Foo incorrectly? You've declared that a KeyValuePair looks like:

  1. message KeyValuePair {
  2.    string key = 1;
  3.    Value value = 2;
  4. }

So it maps a string value to a Value instance. That means you would need:

  1. my_foo = Foo(
  2.     num=123,
  3.     features=[
  4.         KeyValuePair(key="key1", value=Value(strValue="value1")),
  5.         KeyValuePair(key="key2", value=Value(strValue="value2")),
  6.     ],
  7. )

On my system, using your example .proto file (adding syntax = "proto3"; at the top), that runs without errors.

huangapple
  • 本文由 发表于 2023年7月10日 21:30:29
  • 转载请务必保留本文链接：https://go.coder-hub.com/76654250.html
  • protobuf-python
  • protocol-buffers
  • python
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