Python PyQt5实现的简易计算器功能示例

 import sys from PyQt5 import QtWidgets,QtCore,QtGui class Example(QtWidgets.QWidget): def __init__(self): super(Example, self).__init__() self.initUI() self.reset() def initUI(self): self.setWindowTitle('简易计算器') grid = QtWidgets.QGridLayout() self.display = QtWidgets.QLineEdit('0') self.display.setFont(QtGui.QFont("Times", 20)) self.display.setReadOnly(True) self.display.setAlignment(QtCore.Qt.AlignRight) self.display.setMaxLength(15) grid.addWidget(self.display,0,0,1,4) names = ['Clear', 'Back', '', 'Close', '7', '8', '9', '/', '4', '5', '6', '*', '1', '2', '3', '-', '0', '.', '=', '+'] pos = [(0, 0), (0, 1), (0, 2), (0, 3), (1, 0), (1, 1), (1, 2), (1, 3), (2, 0), (2, 1), (2, 2), (2, 3), (3, 0), (3, 1), (3, 2), (3, 3 ), (4, 0), (4, 1), (4, 2), (4, 3)] c = 0 for name in names: button = QtWidgets.QPushButton(name) button.setFixedSize(QtCore.QSize(60,30)) button.clicked.connect(self.buttonClicked) # 给每个按钮设置信号/槽 if c == 2: pass #grid.addWidget(QtWidgets.QLabel(''), 0, 2) #替换 第三个按钮 为 文本标签！ else: grid.addWidget(button, pos[c][0]+1, pos[c][1]) c = c + 1 self.setLayout(grid) def buttonClicked(self): #sender = self.sender(); # 确定信号发送者 #self.display.setText(sender.text()) text = self.sender().text() if text in '+-*/': self.history.append(self.number) # 数字入栈 self.history.append(text) # 运算符入栈 self.operator = text # 设置当前运算符 self.number = "" # 数字清空 self.numberType = "int" return elif text == "=": self.calculate() # 计算 elif text == "Back": pass elif text == "Clear": self.reset() elif text == "Close": self.close() elif text == ".": if self.numberType == "int": self.number += text self.numberType = "float" else: self.number = self.number + text if self.number != "0" else text self.display.setText(self.number) def calculate(self): pass def reset(self): self.number = "0" self.result = 0 self.history = [] self.operator = '' # +,-,*,/ self.numberType = 'int' # int与float两种，如果输入了小数点则为实数 app = QtWidgets.QApplication(sys.argv) ex = Example() ex.show() sys.exit(app.exec_())