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987天前import sys |
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QLineEdit, QVBoxLayout, QHBoxLayout |
class Calculator(QWidget): |
def __init__(self): |
super().__init__() |
self.setWindowTitle('Calculator') |
self.edit = QLineEdit() |
self.edit.setReadOnly(True) |
layout = QVBoxLayout() |
layout.addWidget(self.edit) |
buttons = [ |
['7', '8', '9', '+'], |
['4', '5', '6', '-'], |
['1', '2', '3', '*'], |
['0', '.', '=', '/'] |
] |
for row in buttons: |
button_row = QHBoxLayout() |
for label in row: |
button = QPushButton(label) |
button.clicked.connect(self.button_clicked) |
button_row.addWidget(button) |
layout.addLayout(button_row) |
self.setLayout(layout) |
def button_clicked(self): |
button = self.sender() |
if button.text() == '=': |
self.edit.setText(str(eval(self.edit.text()))) |
else: |
self.edit.setText(self.edit.text() + button.text()) |
if __name__ == '__main__': |
app = QApplication(sys.argv) |
calculator = Calculator() |
calculator.show() |
sys.exit(app.exec_()) |
