PyQt5 – Digital StopWatch - GeeksforGeeks

22 Apr, 2020
In this article we will see how we can create a stop watch using Python GUI – PyQt5.A stopwatch is a handheld timepiece designed to measure the amount of time that elapses between its activation and deactivation. A large digital version of a stopwatch designed for viewing at a distance, as in a sports stadium, is called a Stopclock.
Steps to create a stop watch –
1. Create a counter which signify the seconds2. Create flag to know when to start and when to pause, set it to False3. Create label to show seconds4. Create three push button for starting the stop watch pausing the stop watch and for re-setting the stop watch5. Add action to each push button.6. Inside start push button action make flag to true7. Inside pause push button action make flag to false8. Inside reset push button action make flag to false and make the counter value to 09. Create QTimer object which calls a method after every 100 millisecond i.e 10th part of second10. Inside QTimer object method check for the flag status if it is true increment the counter11. Show the counter value through label using setText method.
Below is the implementation –
# importing librariesfrom PyQt5.QtWidgets import * from PyQt5 import QtCore, QtGuifrom PyQt5.QtGui import * from PyQt5.QtCore import * import sys    class Window(QMainWindow):      def __init__(self):        super().__init__()          # setting title        self.setWindowTitle("Python Stop watch")          # setting geometry        self.setGeometry(100, 100, 400, 500)          # calling method        self.UiComponents()          # showing all the widgets        self.show()      # method for widgets    def UiComponents(self):          # counter        self.count = 0          # creating flag        self.flag = False          # creating a label to show the time        self.label = QLabel(self)          # setting geometry of label        self.label.setGeometry(75, 100, 250, 70)          # adding border to the label        self.label.setStyleSheet("border : 4px solid black;")          # setting text to the label        self.label.setText(str(self.count))          # setting font to the label        self.label.setFont(QFont('Arial', 25))          # setting alignment to the text of label        self.label.setAlignment(Qt.AlignCenter)          # creating start button        start = QPushButton("Start", self)          # setting geometry to the button        start.setGeometry(125, 250, 150, 40)          # add action to the method        start.pressed.connect(self.Start)          # creating pause button        pause = QPushButton("Pause", self)          # setting geometry to the button        pause.setGeometry(125, 300, 150, 40)          # add action to the method        pause.pressed.connect(self.Pause)          # creating reset button        re_set = QPushButton("Re-set", self)          # setting geometry to the button        re_set.setGeometry(125, 350, 150, 40)          # add action to the method        re_set.pressed.connect(self.Re_set)          # creating a timer object        timer = QTimer(self)          # adding action to timer        timer.timeout.connect(self.showTime)          # update the timer every tenth second        timer.start(100)      # method called by timer    def showTime(self):          # checking if flag is true        if self.flag:              # incrementing the counter            self.count+= 1          # getting text from count        text = str(self.count / 10)          # showing text        self.label.setText(text)        def Start(self):          # making flag to true        self.flag = True      def Pause(self):          # making flag to False        self.flag = False      def Re_set(self):          # making flag to false        self.flag = False          # reseeting the count        self.count = 0          # setting text to label        self.label.setText(str(self.count))    # create pyqt5 appApp = QApplication(sys.argv)  # create the instance of our Windowwindow = Window()  # start the appsys.exit(App.exec())
Output :
Python-gui
Python-PyQt
Python
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