Python Kivy TypeError：缺少1个必需的位置参数：'self'

Question

最近我下载了Kivy模块，我认为我已经正确安装了它，但是当我尝试以下代码时：

from kivy.app import App
from kivy.uix.button import Button

class TestApp(App):
    def build(self):
    return Button(text="Hello World")
TestApp.run()     

，并出现以下错误：

[INFO   ] [Logger      ] Record log in C:\Users\User\.kivy\logs\kivy_18-06-
24_6.txt
[INFO   ] [Kivy        ] v1.10.0
[INFO   ] [Python      ] v3.6.5 (v3.6.5:f59c0932b4, Mar 28 2018, 16:07:46) 
[MSC v.1900 32 bit (Intel)]
[INFO   ] [Factory     ] 194 symbols loaded
[INFO   ] [Image       ] Providers: img_tex, img_dds, img_pil, img_gif 
(img_sdl2, img_ffpyplayer ignored)
[INFO   ] [Text        ] Provider: pil(['text_sdl2'] ignored)
 Traceback (most recent call last):
   File "C:\Users\User\Desktop\experiments - 3 (1).py", line 34, in <module>
   TestApp.run()
 TypeError: run() missing 1 required positional argument: 'self'

Answer 1

您应该创建此类的实例并在其上调用方法：

app = TestApp()
app.run()