python 程序员计算器实现，使用Qt库实现带有界面操作的

下面是一个使用 PyQt5 实现的简单计算器界面：

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QVBoxLayout, QLineEdit


class Calculator(QWidget):

    def __init__(self):
        super().__init__()
        self.initUI()

    def initUI(self):
        self.setWindowTitle('Calculator')
        self.setGeometry(300, 300, 300, 200)

        # 创建一个文本框
        self.text_box = QLineEdit(self)
        self.text_box.move(20, 20)
        self.text_box.resize(260, 30)

        # 创建按钮
        self.button_1 = QPushButton('1', self)
        self.button_1.move(20, 60)
        self.button_1.clicked.connect(lambda: self.button_click('1'))

        self.button_2 = QPushButton('2', self)
        self.button_2.move(80, 60)
        self.button_2.clicked.connect(lambda: self.button_click('2'))

        self.button_3 = QPushButton('3', self)
        self.button_3.move(140, 60)
        self.button_3.clicked.connect(lambda: self.button_click('3'))

        self.button_4 = QPushButton('4', self)
        self.button_4.move(20, 100)
        self.button_4.clicked.connect(lambda: self.button_click('4'))

        self.button_5 = QPushButton('5', self)
        self.button_5.move(80, 100)
        self.button_5.clicked.connect(lambda: self.button_click('5'))

        self.button_6 = QPushButton('6', self)
        self.button_6.move(140, 100)
        self.button_6.clicked.connect(lambda: self.button_click('6'))

        self.button_7 = QPushButton('7', self)
        self.button_7.move(20, 140)
        self.button_7.clicked.connect(lambda: self.button_click('7'))

        self.button_8 = QPushButton('8', self)
        self.button_8.move(80, 140)
        self.button_8.clicked.connect(lambda: self.button_click('8'))

        self.button_9 = QPushButton('9', self)
        self.button_9.move(140, 140)
        self.button_9.clicked.connect(lambda: self.button_click('9'))

        self.button_0 = QPushButton('0', self)
        self.button_0.move(80, 180)
        self.button_0.clicked.connect(lambda: self.button_click('0'))

        self.button_add = QPushButton('+', self)
        self.button_add.move(200, 60)
        self.button_add.clicked.connect(lambda: self.button_click('+'))

        self.button_subtract = QPushButton('-', self)
        self.button_subtract.move(200, 100)
        self.button_subtract.clicked.connect(lambda: self.button_click('-'))

        self.button_multiply = QPushButton('*', self)
        self.button_multiply.move(200, 140)
        self.button_multiply.clicked.connect(lambda: self.button_click('*'))

        self.button_divide = QPushButton('/', self)
        self.button_divide.move(200, 180)
        self.button_divide.clicked.connect(lambda: self.button_click('/'))

        self.button_clear = QPushButton('C', self)
        self.button_clear.move(20, 180)
        self.button_clear.clicked.connect(lambda: self.clear_text_box())

        self.button_equal = QPushButton('=', self)
        self.button_equal.move(140, 180)
        self.button_equal.clicked.connect(lambda: self.calculate())

        # 显示界面
        self.show()

    def button_click(self, text):
        """按钮点击事件"""
        self.text_box.setText(self.text_box.text() + text)

    def clear_text_box(self):
        """清空文本框"""
        self.text_box.setText('')

    def calculate(self):
        """计算结果"""
        try:
            result = eval(self.text_box.text())
            self.text_box.setText(str(result))
        except Exception as e:
            self.text_box.setText('Error')


if __name__ == '__main__':
    app = QApplication(sys.argv)
    calculator = Calculator()
    sys.exit(app.exec_())

这个计算器界面包含了数字按钮、加减乘除按钮、等号按钮和清空按钮。用户点击按钮时，按钮的文本会添加到文本框中。当用户点击等号按钮时，程序会尝试使用 `eval()` 函数计算文本框中的表达式，并在文本框中显示结果。如果计算出现异常，程序会在文本框中显示 `Error`。