python 笔记7

 QT

编程模板：

from PyQt5.Qt import *
import sys

class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("软件名称")
        self.resize(600,500)
        self.func_list()
#调用super 类初始化继承
#调用方法集合
    def func_list(self):
        self.func()
        self.func1()
        self.func2()
#调用方法，形成方法集合

    def func(self):

        btn = QPushButton(self)
        btn.setText("按钮")
        btn.resize(120,30)
        btn.move(100,100)
        btn.setStyleSheet('font-size:20px')
    def func1(self):
        lable = QLabel(self)
        lable.setText("标签")
        lable.setStyleSheet('font-size:16px;')
    def func2(self):
        label2 = QLabel(self)
        label2.setText('标签')
        label2.move(200,300)
        label2.setStyleSheet('font-size:16px;')
if __name__ =='__main__':
    app =QApplication(sys.argv)
    win= Window()
    win.show()
    sys.exit(app.exec_())  //循环调用保持方法。
删除OBJ 对象
代码举例

from PyQt5.Qt import *
import sys

class Window(QWidget):
    def __init__(self):
        super().__init__()
        self.setWindowTitle("软件名称")
        self.resize(600,500)
        self.func_list()

    def func_list(self):
        self.func()

    def func(self):
     obj1 = QObject()
#  obj1 转换为全局变量，self 指的是窗体

     self.obj1 = obj1

     obj2 = QObject()
     obj3= QObject()
     obj2.setParent(obj1)
     obj3.setParent(obj2)
     print(obj1)
     print(obj2)
     print(obj3)
     obj1.destroyed.connect(lambda :print('obj1,释放'))
     obj2.destroyed.connect(lambda: print('obj2,释放'))
     l1 = QLabel(self)
     l1.setText('l1')
     l1.move(100,100)
     l2 = QLabel(self)
     l2.setText('l2')
     l2.move(200,200)

# deletelater 是代码执行完成后执行， 无论它在哪一行
     l2.deleteLater()
     #del obj2
     print(obj1.deleteLater())
     print(obj1.children())

if __name__ =='__main__':
    app =QApplication(sys.argv)
    win= Window()
    win.show()
    sys.exit(app.exec_())