Created
April 28, 2017 16:19
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sudo apt install python3-pyqt5
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#!/usr/bin/env python | |
from PyQt5.QtWidgets import (QApplication, QWidget, | |
QGridLayout, QVBoxLayout, QHBoxLayout, | |
QLabel, QLineEdit, QPushButton) | |
def factorial(n): | |
if n < 0: | |
return -1 | |
elif n == 0: | |
return 1 | |
else: | |
return n * factorial(n-1) | |
class MainWindow(QWidget): | |
def __init__(self, parent=None): | |
super(MainWindow, self).__init__(parent) | |
self.inputLine = QLineEdit() | |
self.outputLine = QLineEdit() | |
self.outputLine.setReadOnly(True) | |
self.calcButton = QPushButton("&Calc") | |
self.calcButton.clicked.connect(self.calc) | |
lineLayout = QGridLayout() | |
lineLayout.addWidget(QLabel("num"), 0, 0) | |
lineLayout.addWidget(self.inputLine, 0, 1) | |
lineLayout.addWidget(QLabel("result"), 1, 0) | |
lineLayout.addWidget(self.outputLine, 1, 1) | |
buttonLayout = QVBoxLayout() | |
buttonLayout.addWidget(self.calcButton) | |
mainLayout = QHBoxLayout() | |
mainLayout.addLayout(lineLayout) | |
mainLayout.addLayout(buttonLayout) | |
self.setLayout(mainLayout) | |
self.setWindowTitle("Factorial") | |
def calc(self): | |
n = int(self.inputLine.text()) | |
r = factorial(n) | |
self.outputLine.setText(str(r)) | |
if __name__ == '__main__': | |
import sys | |
app = QApplication(sys.argv) | |
main_window = MainWindow() | |
main_window.show() | |
sys.exit(app.exec_()) |
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