PyQt 实例：猜数字

import sys
import random
from PyQt5.QtWidgets import (QWidget,QApplication,QHBoxLayout,QVBoxLayout,
QLineEdit,QPushButton,QMessageBox)
class MyProject(QWidget):
    def __init__(self):
        super().__init__()
        self.answer = random.randint(0,100)
        # print(self.answer)
        self.initUI()

    def initUI(self):
        w = QWidget(self)

        hb = QHBoxLayout()
        hb.addStretch(1)

        vb = QVBoxLayout()
        self.le = QLineEdit("输入0-100之间的整数")
        self.le.selectAll()
        self.le.setFocus()

        wc = QPushButton("我猜")
        wc.setToolTip("看看对不对")
        wc.clicked.connect(self.checkAnswer)

        vb.addStretch(1)
        vb.addWidget(self.le)
        vb.addSpacing(50)
        vb.addWidget(wc)
        vb.addStretch(1)

        hb.addLayout(vb)
        hb.addStretch(1)

        self.setLayout(hb)

        self.resize(300,300)
        self.show()
    def checkAnswer(self):
        if not self.le.text().isdigit():
            QMessageBox.about(self,"提示","请输入0-100之间的整数")
            self.le.selectAll()
            self.le.setFocus()
            return
        num = int(self.le.text())
        if num < self.answer:
            QMessageBox.about(self,"提示","猜小了")
            self.le.selectAll()
            self.le.setFocus()
        elif num > self.answer:
            QMessageBox.about(self,"提示","猜大了")
            self.le.selectAll()
            self.le.setFocus()
        else:
            re = QMessageBox.question(self,"提示","猜对了：" + str(num) + "，还来吗？",QMessageBox.Yes|QMessageBox.No)
            if re == QMessageBox.Yes:
                self.answer = random.randint(0,100)
                self.le.clear()
                self.le.setFocus()
                # print(self.answer)
            else:
                self.close()

if __name__ == '__main__':
    app = QApplication(sys.argv)
    mp = MyProject()
    sys.exit(app.exec_())

原文