Dog Years Calculator using PyQt5 - GeeksforGeeks

01 Aug, 2020
In this article, we will see how we can create a dog year calculator using PyQt5. Dog year calculator will tell the age of a dog if the dog was human, the dog grew a lot faster than humans. Below is how the calculator will look like : 
PyQt5 is a cross-platform GUI toolkit, a set of python bindings for Qt v5. One can develop an interactive desktop application with so much ease because of the tools and simplicity provided by this library. Below is the command to install the PyQt5
pip install PyQt5

GUI Implementation Steps : 
Create a heading label that displays the calculator name. Create a label to show users to enter the age of the dog. Create a QSpinBox object for the user to enter the years. Create push-button for calculating the age. Create a label to show the calculated age. 
Create a heading label that displays the calculator name. 
Create a label to show users to enter the age of the dog. 
Create a QSpinBox object for the user to enter the years. 
Create push-button for calculating the age. 
Create a label to show the calculated age. 
Back-End Implementation : 
Add an action to the push button. Set minimum and maximum values to the spin box. Inside the push button, an action gets the value of spin box. If the value is 1 then age is 15, if the value is 2 then age is 24 else age is increment by 4 for next years. Show the calculated age with the help of a label. 
Add an action to the push button. 
Set minimum and maximum values to the spin box. 
Inside the push button, an action gets the value of spin box. 
If the value is 1 then age is 15, if the value is 2 then age is 24 else age is increment by 4 for next years. 
Show the calculated age with the help of a label. 
Below is the implementation 
Python3
# importing required librariesfrom PyQt5.QtWidgets import * from PyQt5 import QtCore, QtGuifrom PyQt5.QtGui import * from PyQt5.QtCore import * import datetimeimport sys  # window classclass Window(QMainWindow):        # Constructor     def __init__(self):        super().__init__()          # setting title of the window        self.setWindowTitle("Python ")          # width of the window        self.w_width = 400          # height of the window        self.w_height = 400          # setting geometry of the window        self.setGeometry(100, 100, self.w_width, self.w_height)          # method calling        self.UiComponents()          # showing all the widgets        self.show()      # method for components creation    def UiComponents(self):        # creating head label        head = QLabel("Dog Age Calculator", self)          head.setWordWrap(True)          # setting geometry of the head        head.setGeometry(0, 10, 400, 60)          # font work         font = QFont('Times', 15)        font.setBold(True)        font.setItalic(True)        font.setUnderline(True)          # setting font to the head        head.setFont(font)          # setting alignment of the head        head.setAlignment(Qt.AlignCenter)          # setting color effect to the head        color = QGraphicsColorizeEffect(self)        color.setColor(Qt.darkCyan)        head.setGraphicsEffect(color)            # creating a label        age_label = QLabel("Age of Dog ", self)          # setting geometry to the label        age_label.setGeometry(50, 120, 147, 40)          # setting alignment        age_label.setAlignment(Qt.AlignCenter)          # setting stylesheet        age_label.setStyleSheet("QLabel"                                 "{"                                 "border : 2px solid black;"                                 "background : rgba(70, 70, 70, 35);"                                 "}")          age_label.setFont(QFont('Times', 9))          # creating a spin box        self.age = QSpinBox(self)          # setting geometry to the spin box        self.age.setGeometry(203, 120, 147, 40)          # setting maximum value of spin box        self.age.setMaximum(20)          # setting minimum value of spin box        self.age.setMinimum(1)          # setting suffix to the spin box        self.age.setSuffix(" year(s)")          # setting font and alignment        self.age.setFont(QFont('Times', 9))        self.age.setAlignment(Qt.AlignCenter)              # creating a push button        calculate = QPushButton("Calculate Age", self)          # setting geometry to the push button        calculate.setGeometry(100, 200, 200, 40)          # adding action to the button        calculate.clicked.connect(self.calculate)          # adding color effect to the push button        color = QGraphicsColorizeEffect()        color.setColor(Qt.blue)        calculate.setGraphicsEffect(color)            # creating a label to show result        self.result = QLabel(self)          # setting properties to result label        self.result.setAlignment(Qt.AlignCenter)          # setting geometry        self.result.setGeometry(50, 280, 300, 70)          # making it multi line        self.result.setWordWrap(True)          # setting stylesheet        # adding border and background        self.result.setStyleSheet("QLabel"                                  "{"                                  "border : 3px solid black;"                                  "background : white;"                                  "}")          # setting font        self.result.setFont(QFont('Arial', 11))        # method for calculating the dog's age    def calculate(self):          # getting the spin box value        value = self.age.value()          # if value is 1        if value == 1:              # dog age is 15            d_age = 15          # if value is 2        elif value == 2:              # dog age is 24            d_age = 24          # else dog age get incremented by 4        else:            d_age = 24 + (value - 2) * 4            # showing age through label        self.result.setText("If your dog were a human, it would be : " +str(d_age) + " years old !")      # create pyqt5 appApp = QApplication(sys.argv)  # create the instance of our Windowwindow = Window()  # start the appsys.exit(App.exec())
Output : 
Python-PyQt
Python
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