PyQt5的安装

pip install PyQt5

pip install PyQt5-tools

在路径下venv\Lib\site-packages\pyqt5_tools\Qt\bin找到designer.exe

 life2coding.py

import sys
from  PyQt5.QtCore  import pyqtSlot
from PyQt5.QtWidgets import QApplication,QDialog
from PyQt5.uic import loadUi

class Life2Coding(QDialog):
    def __init__(self):
        super(Life2Coding,self).__init__()
        loadUi('life2coding.ui',self)
        self.setWindowTitle('Life2Coding PyQt5 Gui')
        self.pushButton.clicked.connect(self.on_pushButton_clicked)
    @pyqtSlot()
    def on_pushButton_clicked(self):
        self.label1.setText('welcome:'+self.lineEdit1.text())

app=QApplication(sys.argv)
widget=Life2Coding()
widget.show()
sys.exit(app.exec_())