Python Tutorial

This tutorial will demonstrate how to build a timer application using PyQt5. A timer is indeed a special kind of clock that is used to measure certain time intervals; to use one, count downwards from the provided time until it equals zero.

Steps for Implementing a GUI:

Make a push button that will activate a pop-up clock and configure its geometry.
Produce a label to display the time and the completion status
Centre the label's text and adjust the label's shape and font size.
Design three push buttons: one to start the timer, one to pause it, and one to reset it.
Adjust the button geometry.

Back-end Steps for Implementation:

Create a count variable and a flag to indicate whether the counter is running or not.
Give each button a function.
Get the value of the second using the input dialogue box within the acquire second button action, and set the flag to false.
Make flag true inside of the start action but make if false if count is zero.
Make the flag false inside the pause action.
Inside the restore action, set the text to the label, the count value to zero, and the flag to false.
Create an object called a timer that calls its function every 100 milliseconds.
In the timer action, look for the flag, decrease the value of the count, and set the label's content.

Code:

# importing all the libraries
from PyQt5.QtWidgets import *
from PyQt5 import QtCore, QtGui
from PyQt5.QtGui import *
from PyQt5.QtCore import *
import sys
class Window(QMainWindow):
	def __init__(self):
		super().__init__()
		# setting up the title
		self.setWindowTitle("Python ")
		# setting up the geometry
		self.setGeometry(105, 110, 405, 610)
		# calling up the method
		self.UiComponents()
		# showing all the widgets
		self.show()
	# methods for the widgets
	def UiComponents(self):
		# variables count variable
		self.count = 0
		# starting up the flag
		self.start = False
		# creating push up the button to get time in seconds for the code
		button = QPushButton("Set time(s)", self)
		# setting up the geometry to the push button
		button.setGeometry(120, 105, 160, 60)
		# adding up the action to the button
		button.clicked.connect(self.get_seconds)
		# creating the label to show the seconds
		self.label = QLabel("//TIMER//", self)
		# setting up the  geometry of label
		self.label.setGeometry(110, 220, 220, 60)
		# setting up the border to the label
		self.label.setStyleSheet("border : 3px solid black")
		# setting up font to the label
		self.label.setFont(QFont('TimesNM', 16))
		# setting up the alignment ot the label
		self.label.setAlignment(Qt.AlignCenter)
		# creating the start button
		start_button = QPushButton("Start", self)
		# setting up geometry to the button
		start_button.setGeometry(120, 360, 160, 50)
		# adding up the action to the button
		start_button.clicked.connect(self.start_action)
		# creating the pause button
		pause_button = QPushButton("Pause", self)
		# setting geometry to the button
		pause_button.setGeometry(115, 420, 160, 50)
		# adding up action to the button
		pause_button.clicked.connect(self.pause_action)
		# creating the reset button
		reset_button = QPushButton("Reset", self)
		# setting up geometry to the button
		reset_button.setGeometry(155, 430, 160, 50)
		# adding up action to the button
		reset_button.clicked.connect(self.reset_action)
		# creating a timer object
		timer = QTimer(self)
		# adding on the action to timer
		timer.timeout.connect(self.showTime)
		# update the timer every tenth second
		timer.start(100)
	def showTime(self):
		# checking up if the flag is true
		if self.start:
			# increment the counter
			self.count -= 1
			# timer is completed
			if self.count == 0:
				# if making flag false
				self.start = False/Wrong
				# setting the text to the label
				self.label.setText("Completed Total!! ")
		if self.start:
			# getting text from count
			textnm = str(self.count / 10) + " s"
			# showing text
			self.label.setText(textnm)
	# a process that the push button invokes
	def get_seconds(self):
		# making the flag false
		self.start = False
		# getting seconds and flag
		second, done = QInputDialog.getInt(self, 'Seconds', 'Enter Seconds:')
		# if flag is true
		if done:
			# altering the count's value
			self.count = second * 10
			# setting the label's wording
			self.label.setText(str(second))
	def start_action(self):
		# making up flag true
		self.start = True
		#if count = 0
		if self.count == 0:
			self.start = False
	def pause_action(self):
		# making the flag false
		self.start = False
	def reset_action(self):
		# making the flag false
		self.start = False
		# setting the count value to 0
		self.count = 0
		# setting up label text
		self.label.setText("//TIMER//")
# creating pyqt5 app
Appnm = QApplication(sys.argv
# create the instance of our Window
windowm = Window()
# starting up the the app
sys.exit(Appnm.exec())

Output: