python_设计和业务分离

成功案例：

设计窗口

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'day2.ui'
#
# Created by: PyQt5 UI code generator 5.4.1
#
# WARNING! All changes made in this file will be lost!

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_Form(object):
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(400, 300)
        self.lineEdit = QtWidgets.QLineEdit(Form)
        self.lineEdit.setGeometry(QtCore.QRect(140, 100, 113, 20))
        self.lineEdit.setObjectName("lineEdit")

        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Form"))

if __name__=="__main__":
    import sys
    app=QtWidgets.QApplication(sys.argv)
    widget = QtWidgets.QWidget()
    ui = Ui_Form()
    ui.setupUi((widget))
    widget.show()
    sys.exit(app.exec_())

业务代码：

import sys
from PyQt5.QtWidgets import QApplication,QWidget
from day2 import Ui_Form

class myform(QWidget,Ui_Form):
    def __init__(self):
        super().__init__()
        self.setupUi(self)
        # self.lineEdit.textChanged.connect(self.label.setText)
                        
if __name__=='__main__':
    app=QApplication(sys.argv)
    w=Form()
    w.show()
    app.exec_()