python - Kivy中为什么会出现解析异常？

Question

AddLocationForm:

<AddLocationForm@BoxLayout>:orientation:"vertical"
    BoxLayout:
        TextInput:
        Button:
            text: "Search"
        Button:
            text: "Current Location"

我有与上面类似的weather.kv 文件，但我收到如下错误

kivy.lang.parser.ParserException:解析器:文件“C:\programming\projects\scripts\kivy\FirstApp\weather.kv”，第3行:

谁能向我解释一下为什么会发生这种情况？

Answer 1

ParserException - 声明后数据无效

   File "/usr/lib/python3/dist-packages/kivy/lang/parser.py", line 575, in parse_level
     'Invalid data after declaration')
 kivy.lang.parser.ParserException: Parser: File ".../weather.kv", line 3:
 ...
       1:AddLocationForm:
       2:
 >>    3:<AddLocationForm@BoxLayout>:orientation:"vertical"
       4:    BoxLayout:
       5:        TextInput:
 ...
 Invalid data after declaration

说明

您遇到以下ParserException，因为当您的kv文件被解析时，它在类规则声明之后不期望任何内容，: 但它发现方向:“垂直”

Programming Guide » Kv language » Rule context

A class rule, declared by the name of a widget class between < > and followed by :, defines how any instance of that class will be graphically represented:

解决方案

天气.kv

AddLocationForm:

<AddLocationForm@BoxLayout>
    orientation: "vertical"
    TextInput:
    Button:
        text: "Search"
    Button:
        text: "Current Location"

输出