from PyQt5.Qt import *
import sys# 创建一个应用程序对象
app = QApplication(sys.argv)window = QWidget()label = QLabel(window)
label.setText('学无止境')
label.move(100, 100)
label.setStyleSheet('background-color:gray')def changeCao():tmp = label.text()+'学无止境'label.setText(tmp)label.adjustSize()btn = QPushButton(window)
btn.clicked.connect(changeCao)window.show()# 应用程序的执行(进入到消息循环,无限循环中,检测整个程序所接收到的用户的交互信息)
sys.exit(app.exec_())

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控件内容不断增长

控件也能自知应内容 

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enjoy