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I want to create a drop-down list in the input html, and the data in this drop-down list can reference my database json. What code should I write in my py file?

This is my input html. Although I can select it on the web page, it is too troublesome to fill it in one by one.

    <tr><td>起始機場: </td><td><input type="text" name="user_placeofdeparture" placeholder="請輸入機場名稱" <input list="airport">
    <datalist id="airport">
    <option value="北京西郊機場">
    <option value="內蒙古赤峰機場">
    <option value="長治王村機場">
    <option value="鄂爾多斯伊金霍洛機場">
    </datalist></td></tr>

    <tr><td>目的機場: </td><td><input type="text" name="user_destination" placeholder="請輸入機場名稱" <input list="airport">
    <datalist id="airport">
    <option value="北京首都國際機場">
    <option value="北京西郊機場">
    <option value="內蒙古赤峰機場">
    <option value="長治王村機場">
    <option value="鄂爾多斯伊金霍洛機場">
    </datalist> 
    </td></tr>

This is my py file. I have originally put the airport names in this txt, but my json also has this, and this json will be used to calculate longitude and latitude in the future.

I'm a little confused, I don't know how to use it. Pleading for help.

Intercept part of the content in the json document

    {"北京首都國際機場": { "latitude":40.08010101, "longitude":116.5849991},"北京西郊機場": { "latitude":39.96080017, "longitude":116.2570038},  "內蒙古赤峰機場": { "latitude":42.23500061, "longitude":118.9079971},"長治王村機場": { "latitude":36.24750137, "longitude":113.1259995},"鄂爾多斯伊金霍洛機場": { "latitude":39.49, "longitude":109.8613889},"大同機場": { "latitude":40.06029892, "longitude":113.4820023}}

Please help.