安装pyqt5

打开cmd。并运行下面指令。

pip install -i http://mirrors.aliyun.com/pypi/simple/ --trusted-host mirrors.aliyun.com Sip
pip install -i http://mirrors.aliyun.com/pypi/simple/ --trusted-host mirrors.aliyun.com pyqt5
pip install -i http://mirrors.aliyun.com/pypi/simple/ --trusted-host mirrors.aliyun.com pyqt5-tools

测试一下：

import sys
from PyQt5 import QtWidgets, QtCore

app = QtWidgets.QApplication(sys.argv)
widget = QtWidgets.QWidget()
widget.resize(360,360)
widget.setWindowTitle("hello, pyqt5")
widget.show()
sys.exit(app.exec_())

import sys
from PyQt5 import QtWidgets, QtCore

app = QtWidgets.QApplication(sys.argv)
widget = QtWidgets.QWidget()
widget.resize(360,360)
widget.setWindowTitle("hello, pyqt5")
widget.show()
sys.exit(app.exec_())

运行。

 

designer.exe所在位置：

F:\Users\Administrator\AppData\Local\Programs\Python\Python38\Lib\site-packages\qt5_applications\Qt\bin