Python 无效语法-kivy

第一次学习kivy，在启动

.kv

文件时遇到了一个问题

main.py：

import kivy
from kivy.app import App
from kivy.uix.widget import Widget
from kivy.uix.gridlayout import GridLayout

class Grid(Widget):
    pass

class App(App):
    def build(self):
        return Grid()

if __name__ == '__main__':
    App().run()

#:kivy 2.0.0
<Grid>:
    Label:
        text: "Hello World!"

Traceback (most recent call last):
  File "C:\Users\megaa\AppData\Local\Programs\Python\Python39\lib\runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "C:\Users\megaa\AppData\Local\Programs\Python\Python39\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "c:\Users\megaa\.vscode\extensions\ms-python.python-2020.12.424452561\pythonFiles\lib\python\debugpy\__main__.py", line 45, in <module>
    cli.main()
  File "c:\Users\megaa\.vscode\extensions\ms-python.python-2020.12.424452561\pythonFiles\lib\python\debugpy/..\debugpy\server\cli.py", line 444, in main        
    run()
  File "c:\Users\megaa\.vscode\extensions\ms-python.python-2020.12.424452561\pythonFiles\lib\python\debugpy/..\debugpy\server\cli.py", line 285, in run_file    
    runpy.run_path(target_as_str, run_name=compat.force_str("__main__"))
  File "C:\Users\megaa\AppData\Local\Programs\Python\Python39\lib\runpy.py", line 267, in run_path
    code, fname = _get_code_from_file(run_name, path_name)
  File "C:\Users\megaa\AppData\Local\Programs\Python\Python39\lib\runpy.py", line 242, in _get_code_from_file
    code = compile(f.read(), fname, 'exec')
  File "d:\python\kivy\tutorial\tutorial2\file.kv", line 1
    <Grid>:
    ^
SyntaxError: invalid syntax

文件.kv：

import kivy
from kivy.app import App
from kivy.uix.widget import Widget
from kivy.uix.gridlayout import GridLayout

class Grid(Widget):
    pass

class App(App):
    def build(self):
        return Grid()

if __name__ == '__main__':
    App().run()

#:kivy 2.0.0
<Grid>:
    Label:
        text: "Hello World!"

Traceback (most recent call last):
  File "C:\Users\megaa\AppData\Local\Programs\Python\Python39\lib\runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "C:\Users\megaa\AppData\Local\Programs\Python\Python39\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "c:\Users\megaa\.vscode\extensions\ms-python.python-2020.12.424452561\pythonFiles\lib\python\debugpy\__main__.py", line 45, in <module>
    cli.main()
  File "c:\Users\megaa\.vscode\extensions\ms-python.python-2020.12.424452561\pythonFiles\lib\python\debugpy/..\debugpy\server\cli.py", line 444, in main        
    run()
  File "c:\Users\megaa\.vscode\extensions\ms-python.python-2020.12.424452561\pythonFiles\lib\python\debugpy/..\debugpy\server\cli.py", line 285, in run_file    
    runpy.run_path(target_as_str, run_name=compat.force_str("__main__"))
  File "C:\Users\megaa\AppData\Local\Programs\Python\Python39\lib\runpy.py", line 267, in run_path
    code, fname = _get_code_from_file(run_name, path_name)
  File "C:\Users\megaa\AppData\Local\Programs\Python\Python39\lib\runpy.py", line 242, in _get_code_from_file
    code = compile(f.read(), fname, 'exec')
  File "d:\python\kivy\tutorial\tutorial2\file.kv", line 1
    <Grid>:
    ^
SyntaxError: invalid syntax

#：kivy 2.0.0
:
标签：
文字：“你好，世界！”

错误代码：

import kivy
from kivy.app import App
from kivy.uix.widget import Widget
from kivy.uix.gridlayout import GridLayout

class Grid(Widget):
    pass

class App(App):
    def build(self):
        return Grid()

if __name__ == '__main__':
    App().run()

#:kivy 2.0.0
<Grid>:
    Label:
        text: "Hello World!"

Traceback (most recent call last):
  File "C:\Users\megaa\AppData\Local\Programs\Python\Python39\lib\runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "C:\Users\megaa\AppData\Local\Programs\Python\Python39\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "c:\Users\megaa\.vscode\extensions\ms-python.python-2020.12.424452561\pythonFiles\lib\python\debugpy\__main__.py", line 45, in <module>
    cli.main()
  File "c:\Users\megaa\.vscode\extensions\ms-python.python-2020.12.424452561\pythonFiles\lib\python\debugpy/..\debugpy\server\cli.py", line 444, in main        
    run()
  File "c:\Users\megaa\.vscode\extensions\ms-python.python-2020.12.424452561\pythonFiles\lib\python\debugpy/..\debugpy\server\cli.py", line 285, in run_file    
    runpy.run_path(target_as_str, run_name=compat.force_str("__main__"))
  File "C:\Users\megaa\AppData\Local\Programs\Python\Python39\lib\runpy.py", line 267, in run_path
    code, fname = _get_code_from_file(run_name, path_name)
  File "C:\Users\megaa\AppData\Local\Programs\Python\Python39\lib\runpy.py", line 242, in _get_code_from_file
    code = compile(f.read(), fname, 'exec')
  File "d:\python\kivy\tutorial\tutorial2\file.kv", line 1
    <Grid>:
    ^
SyntaxError: invalid syntax

回溯（最近一次呼叫最后一次）：
文件“C:\Users\megaa\AppData\Local\Programs\Python\Python39\lib\runpy.py”，第197行，位于\u run\u模块\u as\u main中
返回运行代码（代码、主全局、无、，
文件“C:\Users\megaa\AppData\Local\Programs\Python\Python39\lib\runpy.py”，第87行，在运行代码中
exec（代码、运行\全局）
文件“c:\Users\megaa\.vscode\extensions\ms python.python-2020.12.424452561\pythonFiles\lib\python\debugpy\\uuuuuuuuuuu main\uuuuuuuuuu.py”，第45行
cli.main（）
文件“c:\Users\megaa\.vscode\extensions\ms python.python-2020.12.424452561\pythonFiles\lib\python\debugpy/。\debugpy\server\cli.py”，主目录第444行
运行（）
文件“c:\Users\megaa\.vscode\extensions\ms python.python-2020.12.424452561\pythonFiles\lib\python\debugpy/。\debugpy\server\cli.py”，第285行，在run\u文件中
runpy.run\u路径（target\u as\u str，run\u name=compat.force\u str（“\uuuu main\uuu”））
文件“C:\Users\megaa\AppData\Local\Programs\Python\Python39\lib\runpy.py”，第267行，在运行路径中
代码，fname=\u从\u文件（运行\u名称，路径\u名称）获取\u代码\u
文件“C:\Users\megaa\AppData\Local\Programs\Python\Python39\lib\runpy.py”，第242行，在\u-get\u-code\u-from\u文件中
代码=编译（f.read（），fname，“exec”）
文件“d:\python\kivy\tutorial\tutorial2\File.kv”，第1行
:
^
SyntaxError:无效语法

请记住，您的.kv文件是一个设计文件。我们必须在python脚本中加载它

为此，请在main.py中执行以下操作

现在.kv文件已加载，并应提供预期的输出

快乐学习

编辑1：

拆下支架，它应处于运行状态。 在file.kv中

编辑2： My main.py文件：

输出Kivy窗口：

---

！[output\u kivy\u窗口][https://imgur.com/a/819K20A]

您的代码中没有任何东西会加载file.kv。您的错误看起来很可疑，好像您试图将其作为python文件运行。您能确切解释一下您在做什么吗？我做了yt教程中所做的一切。当我运行python文件时，一切正常，但当我运行kivy文件时，会收到此错误。您提到我在那里我的代码中没有任何东西会加载file.kv，如何加载？kv文件不是python代码，您不能使用python解释器运行它，而应该通过python文件加载它。您可能误解了youtube教程，或者它是错误的。请阅读kivy文档或更好的教程，了解kv文件的工作原理。好的，但可以启动.kv文件way返回我上面提到的错误：是一个规则，网格：是一个根小部件。为了理解差异检查[因此，在原始.kv文件中，定义了小部件，并将规则应用于产生错误的不存在的小部件。通过此编辑，根小部件变得存在（最新代码更改）：不起作用，“语法错误^Grid:”同样的错误？它对我来说非常有效。检查混合缩进。在.kv文件中应该包含制表符或空格。只需复制粘贴我的.py和.kv代码并运行它，然后检查我的输出窗口的imgur链接