pyqt5 helloi world program code example

Example 1: pyqt5 hello world

import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QLabel

# you can copy and run this code

class MainWindow(QMainWindow):
    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)
        self.setWindowTitle("Hello World")
        label = QLabel("Hello World", self)
        
        self.show()

if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = MainWindow()
    sys.exit(app.exec_())

Example 2: pyqt5 hello world gui

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
class window(QWidget):
   def __init__(self, parent = None):
      super(window, self).__init__(parent)
      self.resize(200,50)
      self.setWindowTitle("PyQt5")
      self.label = QLabel(self)
      self.label.setText("Hello World")
      font = QFont()
      font.setFamily("Arial")
      font.setPointSize(16)
      self.label.setFont(font)
      self.label.move(50,20)
def main():
   app = QApplication(sys.argv)
   ex = window()
   ex.show()
   sys.exit(app.exec_())
if __name__ == '__main__':
   main()