The QPushButton PyQt5 Widget

1 - About QPushButton class

The QPushButton widget provides a command button. The button, or command button, is perhaps the most commonly used widget in any GUI: pressing a button to command the computer to perform an action or to answer a question. Typical buttons are OK, Apply, Cancel, Close, Yes, No, and Help.

2 - Create a PyQt5 Button with the QPusButton class

To create a command button of the QPushButton type, all you have to do is instantiate the QPusButton class:

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton

app = QApplication(sys.argv)
win = QWidget()
win.setGeometry(100 , 100 , 500 , 300)

# create a QPusButton
q_btn = QPushButton(win)
q_btn.setText("This is a QPusButton ! ")
q_btn.setGeometry(100 , 100 , 200 , 50)

win.show()
app.exec_()

3 - Bind an action to a QPushButton PyQt5 button

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton

# create a button action
def action():
    print("Why you clicked the button !")

app = QApplication(sys.argv)
win = QWidget()
win.setGeometry(100 , 100 , 500 , 300)

# create a QPusButton
q_btn = QPushButton(win)
q_btn.setText("This is a QPusButton ! ")
q_btn.setGeometry(100 , 100 , 200 , 50)

# bind an action to the button
q_btn.clicked.connect(action)
win.show()
app.exec_()

4 - QPushButton PyQt5 according to the Python object approach

import sys
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton

class Window(QWidget):
    
    def __init__(self , window):
        super().__init__()
        self.window = window
    
    def action(self):
        print("Why you clicked the button !")
        
    def build(self):
        self.window.setWindowTitle("Window With QPusButton !") 
        self.window.setGeometry(100 , 100 , 500 , 300)
        
        # create a QPushButton
        self.q_btn = QPushButton(self.window)
        self.q_btn.setText("This is a QPushButton from object approach !")
        self.q_btn.setGeometry(100 , 100 , 250 , 35)
        self.q_btn.clicked.connect(self.action)
        
        
if __name__ == "__main__":
    app = QApplication(sys.argv)
    win = QWidget()
    
    myWin = Window(win)
    myWin.build()
    
    win.show()
    app.exec_()