Hello PyQt5, hellopyqt5

Hello PyQt5, hellopyqt5

For GUI programming on ubuntu, PyQt5 is a good choice. First, install PyQt5. Terminal input command:Pip3 install PyQt5You can.

1. Create a directory x01.PyQtHello and add the file hello. py as follows:

import sysfrom PyQt5.QtCore import *from PyQt5.QtGui import *from PyQt5.QtWidgets import *app = QApplication(sys.argv)dlg = QDialog()label = QLabel("<font color=red size=5><b>Hello PyQt5!</b></font>")layout = QVBoxLayout()layout.addWidget(label)dlg.setLayout(layout)dlg.show()app.exec_()

After saving the file, enter the following command on the terminal:Python3 hello. pyRun. As follows:

2. Add another file calc. py as follows:

from __future__ import divisionimport sys from math import *from PyQt5.QtCore import *from PyQt5.QtGui import *from PyQt5.QtWidgets import *class Form(QDialog):    def __init__(self, parent=None):        super(Form, self).__init__(parent)        self.browser = QTextBrowser()        self.lineEdit = QLineEdit("Type an expression and press enter.")        self.lineEdit.selectAll()        layout = QVBoxLayout()        layout.addWidget(self.browser)        layout.addWidget(self.lineEdit)        self.setLayout(layout)        self.lineEdit.setFocus()        self.lineEdit.returnPressed.connect(self.updateUi)        self.setWindowTitle("Calculate")    def updateUi(self):        text = self.lineEdit.text()        try:            self.browser.append("%s = <b>%s</b>" % (text, eval(text)))        except:            self.browser.append("<font color=red>%s is invalid!</font>" % text)app = QApplication(sys.argv)form = Form()form.show()app.exec_()

Similarly, enter the following command:Python3 calc. pyRun. As follows:

Two small experiments show that PyQt5 is good for GUI programming, so it is recommended.