Python/Kivy Assertion Error -


i obtained assertion error while attempting learn boxlayout in kivy. cannot figure out has went wrong.

  kivy.app import app     kivy.uix.button import button     kivy.uix.boxlayout import boxlayout      class boxlayoutapp(app):         def build(self):             return boxlayout()       if __name__=="__main__":       boxlayoutapp().run()

and kv code:

<boxlayout>:     boxlayout:         button:             text: "test"         button:             text: "test"         button:             text: "test"     boxlayout:         button:             text: "test"         button:             text: "test"         button:             text: "test"

edit: tried subclass boxlayout suggested however, still face assertionerror. full (original) error message reproduce here:

 traceback (most recent call last):    file "boxlayout.py", line 12, in <module>      boxlayoutapp().run()    file "c:\users\user\appdata\local\programs\python\python36-32\lib\site-packages\kivy\app.py", line 802, in run      root = self.build()    file "boxlayout.py", line 8, in build      return boxlayout()    file "c:\users\user\appdata\local\programs\python\python36-32\lib\site-packages\kivy\uix\boxlayout.py", line 131, in __init__      super(boxlayout, self).__init__(**kwargs)    file "c:\users\user\appdata\local\programs\python\python36-32\lib\site-packages\kivy\uix\layout.py", line 76, in __in it__      super(layout, self).__init__(**kwargs)    file "c:\users\user\appdata\local\programs\python\python36-32\lib\site-packages\kivy\uix\widget.py", line 345, in __i nit__      builder.apply(self, ignored_consts=self._kwargs_applied_init)    file "c:\users\user\appdata\local\programs\python\python36-32\lib\site-packages\kivy\lang\builder.py", line 451, in pply      self._apply_rule(widget, rule, rule, ignored_consts=ignored_consts)    file "c:\users\user\appdata\local\programs\python\python36-32\lib\site-packages\kivy\lang\builder.py", line 566, in _ apply_rule      self.apply(child)    file "c:\users\user\appdata\local\programs\python\python36-32\lib\site-packages\kivy\lang\builder.py", line 451, in pply      self._apply_rule(widget, rule, rule, ignored_consts=ignored_consts)    file "c:\users\user\appdata\local\programs\python\python36-32\lib\site-packages\kivy\lang\builder.py", line 464, in _ apply_rule      assert(rule not in self.rulectx)  assertionerror

try subclassing boxlayout instead:

from kivy.app import app kivy.uix.button import button kivy.uix.boxlayout import boxlayout kivy.lang import builder   class myboxlayout(boxlayout):     pass   builder.load_string('''  <myboxlayout>:     boxlayout:         button:             text: "test"         button:             text: "test"         button:             text: "test"     boxlayout:         button:             text: "test"         button:             text: "test"         button:             text: "test"  ''')   class boxlayoutapp(app):     def build(self):         return myboxlayout()   if __name__=="__main__":     boxlayoutapp().run()

the assertionerror being thrown because try apply rules same class nesting.
in other words apply rule class, shall contain itself.
causes issues.
following throw same error.

<myboxlayout>:     myboxlayout:

-

Comments

  1. coderforuMay 26, 2021 at 6:45 PM

    class boxlayoutapp(app):

    use the class name in capital I too have this problem when I put class name in small and used some words as a class name eg:layout like that

    try this:
    class Boxlayoutapp(app):

    I hope this will help you.

    ReplyDelete

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