一個最基本的kivy程序：

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

class TestApp(App):
def build(self):
return Button(text='Hell')

TestApp().run()

§1 kivy的兩種形式
py文件內(nèi)直接引用
kv文件配合py文件

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

class IndexPage(BoxLayout):
def init(self,kwargs):
super().init(kwargs)
self.join = Button(text='Hello world')
self.add_widget(self.join)

class TestApp(App):
def build(self):
return IndexPage()

if name == "main":
test = TestApp()
test.run()