安装PySide2

输入pip install PySide2安装Qt for Python，如果安装过慢需要翻墙，则可以使用国内清华镜像下载，输入命令pip install --user -i https://pypi.tuna.tsinghua.edu.cn/simple PySide2，如下图，

示例Demo

import random
import sysfrom PySide2 import QtCore, QtWidgets, QtGuiclass MyWidget(QtWidgets.QWidget):def __init__(self):super().__init__()self.hello = ["您已点击1次", "您已点击2次", "您已点击3次", "您已点击4次"]self.button = QtWidgets.QPushButton("请点击按钮")self.text = QtWidgets.QLabel("测试用户界面")self.text.setAlignment(QtCore.Qt.AlignCenter)self.layout = QtWidgets.QVBoxLayout()self.layout.addWidget(self.text)self.layout.addWidget(self.button)self.setLayout(self.layout)self.button.clicked.connect(self.magic)def magic(self):self.text.setText(random.choice(self.hello))if __name__ == "__main__":app = QtWidgets.QApplication([])widget = MyWidget()widget.resize(600, 400)widget.show()sys.exit(app.exec_())

可能报错如下，

Class QMacAutoReleasePoolTracker is implemented in both xxx and xxx. One of the two will be used. Which one is undefined.

该原因是mac版本下安装的opencv包包含一些qt的头文件与PyQt5冲突了，导致无法正确导入相应的包。

输入命令pip uninstall xxx卸载掉冲突的包即可。最后输出UI界面。