python f-string未正确格式化变量的dict

发布于 2025-01-25 21:15:20 字数 893 浏览 2 评论 0原文

我有一个API呼叫的有效载荷，例如：

start_period = "2022-05-02"
end_period = "2022-05-02"

payload = {"period": f"{{'p1': [{{'type': 'D', 'start': '{start_period}', 'end': '{end_period}'}}]}}",
               "max-results": 50,
               "page-num": 1,
               "options": {}
               }

当我发送此有效载荷时，我会检索HTTP 403错误。有效载荷的期间在pycharm中调试时看起来像：

'{\'p1\': [{\'type\': \'D\', \'start\': \'2022-05-02\', \'end\': \'2022-05-02\'}]}'

dict本身内（再次在pycharm调试器中）：

{'period': "{'p1': [{'type': 'D', 'start': '2022-05-02', 'end': '2022-05-02'}]}", 'max-results': 50, 'page-num': 1, 'options': {}}

它应该像这样：

{"period": {"p1": [{"type": "D", "start": "2022-05-02", "end": "2022-05-02"}]}, "max-results": 50, "page-num": 1, 'options': {}}

或在我不确定单引号是否在抛出此错误。我目前的F串是否正确？

原文

I have a payload for an API call, like so:

start_period = "2022-05-02"
end_period = "2022-05-02"

payload = {"period": f"{{'p1': [{{'type': 'D', 'start': '{start_period}', 'end': '{end_period}'}}]}}",
               "max-results": 50,
               "page-num": 1,
               "options": {}
               }

When I send this payload, I retrieve a HTTP 403 error. The payload's period when debugging in PyCharm looks like:

'{\'p1\': [{\'type\': \'D\', \'start\': \'2022-05-02\', \'end\': \'2022-05-02\'}]}'

or within the dict itself (again in PyCharm Debugger):

{'period': "{'p1': [{'type': 'D', 'start': '2022-05-02', 'end': '2022-05-02'}]}", 'max-results': 50, 'page-num': 1, 'options': {}}

It should look like this:

{"period": {"p1": [{"type": "D", "start": "2022-05-02", "end": "2022-05-02"}]}, "max-results": 50, "page-num": 1, 'options': {}}

(note the extra quotation marks wrapping around the entire period). I'm not sure if the single quotations are throwing this error. Is my current f-string correct?

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青芜 2025-02-01 21:15:20

这些引号表明这是一个字符串。它是传输数据中的字符串，因为它是有效载荷中的字符串。

如果您正在使用某些内容将有效载荷转换为JSON进行转移，请不要预先编码“周期”部分。如果这样做，则JSON格式化器将将整个部分编码为字符串，而不是对象＆amp;数组。相反，使用python dicts＆amp;阵列，让JSON格式处理转换。

payload = {
    "period": {
        'p1': [{
            'type': 'D',
            'start': start_period,
            'end': end_period
        }]
    },
    "max-results": 50,
    "page-num": 1,
    "options": {},
}

json.dumps(payload)

Those quotes indicate it's a string. It's appearing as a string in the transfer data because it's a string in payload.

If you're using something to convert the payload to JSON for transfer, don't pre-encode the "period" portion. If you do, the JSON formatter will then encode that entire portion as a string, rather than as objects & arrays. Instead, use Python dicts & arrays and let the JSON formatter handle the conversion.

payload = {
    "period": {
        'p1': [{
            'type': 'D',
            'start': start_period,
            'end': end_period
        }]
    },
    "max-results": 50,
    "page-num": 1,
    "options": {},
}

json.dumps(payload)

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