python中kivy问题

Question

[INFO   ] [Logger      ] Record log in /storage/emulated/0/pythonfile/.kivy/logs/kivy_21-06-28_12.txt
[INFO   ] [Kivy        ] v1.11.1
[INFO   ] [Kivy        ] Installed at "/data/user/0/ru.iiec.pydroid3/files/aarch64-linux-android/lib/python3.8/site-packages/kivy/__init__.py"
[INFO   ] [Python      ] v3.8.3 (default, May 27 2020, 02:08:17)
[GCC 9.3.0]
[INFO   ] [Python      ] Interpreter at "/data/user/0/ru.iiec.pydroid3/files/aarch64-linux-android/bin/python3"
[INFO   ] [Factory     ] 184 symbols loaded
[INFO   ] [Image       ] Providers: img_tex, img_dds, img_sdl2, img_pil, img_gif (img_ffpyplayer ignored)
Traceback (most recent call last):
   File "/storage/emulated/0/pythonfile/test11.py", line 15, in <module>
     TestApp().run() 
   File "/data/user/0/ru.iiec.pydroid3/files/aarch64-linux-android/lib/python3.8/site-packages/kivy/app.py", line 828, in run
     self.load_kv(filename=self.kv_file)
   File "/data/user/0/ru.iiec.pydroid3/files/aarch64-linux-android/lib/python3.8/site-packages/kivy/app.py", line 599, in load_kv
     root = Builder.load_file(rfilename)
   File "/data/user/0/ru.iiec.pydroid3/files/aarch64-linux-android/lib/python3.8/site-packages/kivy/lang/builder.py", line 301, in load_file
     return self.load_string(data, **kwargs)
   File "/data/user/0/ru.iiec.pydroid3/files/aarch64-linux-android/lib/python3.8/site-packages/kivy/lang/builder.py", line 368, in load_string
     parser = Parser(content=string, filename=fn)
   File "/data/user/0/ru.iiec.pydroid3/files/aarch64-linux-android/lib/python3.8/site-packages/kivy/lang/parser.py", line 401, in __init__
     self.parse(content)
   File "/data/user/0/ru.iiec.pydroid3/files/aarch64-linux-android/lib/python3.8/site-packages/kivy/lang/parser.py", line 510, in parse
     objects, remaining_lines = self.parse_level(0, lines)
   File "/data/user/0/ru.iiec.pydroid3/files/aarch64-linux-android/lib/python3.8/site-packages/kivy/lang/parser.py", line 613, in parse_level
     _objects, _lines = self.parse_level(
   File "/data/user/0/ru.iiec.pydroid3/files/aarch64-linux-android/lib/python3.8/site-packages/kivy/lang/parser.py", line 673, in parse_level
     if current_property[:3] == 'on_':
TypeError: 'NoneType' object is not subscriptable

Answer 1

你的变量是一个None类型，你看看那里没定义，或者返回值是None