PyQt5 – Percentile Calculator

In this article we will see how we can create a percentile calculator using PyQt5, below is how the percentile calculator will look like

GUI implementation steps
1. Create a heading label that display the calculator name
2. Create label and line edit pair for total students, label to show what user has to enter and line edit to enter text
3. Similarly create a pair for getting rank
4. Create a push button to calculate the percentile
5. Create a label to show the calculated percentile

Back end implementation steps
1. Make the line edit to accept only the number as input
2. Add action to the push button
3. Inside the push button action get the text of the line edits
4. Check if the line edit text is empty or zero then return so that function will not execute further
5. Convert the text value into integer
6. Calculate the percentile and set this value to the label

Below is the implementation

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# importing 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 title
        self.setWindowTitle("Python ")
  
        # width of window
        self.w_width = 400
  
        # height of window
        self.w_height = 400
  
        # setting geometry
        self.setGeometry(100, 100, self.w_width, self.w_height)
  
        # calling method
        self.UiComponents()
  
        # showing all the widgets
        self.show()
  
    # method for components
    def UiComponents(self):
  
        # creating head label
        head = QLabel("Percentile Calculator", self)
  
        # setting geometry to the head
        head.setGeometry(0, 10, 400, 60)
  
        # font
        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
        t_label = QLabel("Total Participants", self)
  
        # setting properties to the  label
        t_label.setAlignment(Qt.AlignCenter)
        t_label.setGeometry(20, 100, 170, 40)
        t_label.setStyleSheet("QLabel"
                              "{"
                              "border : 2px solid black;"
                              "background : rgba(70, 70, 70, 35);"
                              "}")
        t_label.setFont(QFont('Times', 9))
  
        # creating a QLineEdit object to get the total participants
        self.total = QLineEdit(self)
  
        # accepting only number as input
        onlyInt = QIntValidator()
        self.total.setValidator(onlyInt)
  
        # setting properties to the line edit
        self.total.setGeometry(200, 100, 180, 40)
        self.total.setAlignment(Qt.AlignCenter)
        self.total.setFont(QFont('Times', 9))
  
        # creating a rank label
        r_label = QLabel("Rank ", self)
  
        # setting properties to the label
        r_label.setAlignment(Qt.AlignCenter)
        r_label.setGeometry(20, 150, 170, 40)
        r_label.setStyleSheet("QLabel"
                              "{"
                              "border : 2px solid black;"
                              "background : rgba(70, 70, 70, 35);"
                              "}")
        r_label.setFont(QFont('Times', 9))
  
        # creating a QLineEdit object to get the rank
        self.rank = QLineEdit(self)
  
        # accepting only number as input
        onlyInt = QIntValidator()
        self.rank.setValidator(onlyInt)
  
        # setting properties to the line edit
        self.rank.setGeometry(200, 150, 180, 40)
        self.rank.setAlignment(Qt.AlignCenter)
        self.rank.setFont(QFont('Times', 9))
  
  
        # creating a push button
        calculate = QPushButton("Calculate Percentile", self)
  
        # setting geometry to the push button
        calculate.setGeometry(125, 220, 150, 40)
  
        # adding action to the calculate button
        calculate.clicked.connect(self.calculate_action)
  
        # creating a label to show percentile
        self.result = QLabel(self)
  
        # setting properties to result label
        self.result.setAlignment(Qt.AlignCenter)
        self.result.setGeometry(50, 300, 300, 60)
        self.result.setStyleSheet("QLabel"
                                  "{"
                                  "border : 3px solid black;"
                                  "background : white;"
                                  "}")
        self.result.setFont(QFont('Arial', 11))
  
  
    def calculate_action(self):
  
  
        # getting total number of students
        students = self.total.text()
  
        # getting rank
        rank = self.rank.text()
  
        # if no input is given close the function
        if len(students) == 0 or len(rank) == 0:
            return
  
        # converting students into integer
        students = int(students)
  
        # converting rank into integer
        rank = int(rank)
  
        # if user enter total value as 0
        # return the function
        if students == 0 or rank == 0:
            return
  
        # variable to store the result upto 3
        # decimal points
        result = round((students - rank) / students * 100, 3)
  
        # setting text to the result label
        self.result.setText("Percentile : " + str(result))
  
  
    # create pyqt5 app
App = QApplication(sys.argv)
  
# create the instance of our Window
window = Window()
  
# start the app
sys.exit(App.exec())

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