Question

Exercise 3) Creating a QT program to search for Customer Phone Number : Create a text file (customer.txt) and put names and phone numbers into it. each name has to have its own phone number right under it. In the QT window, the user has to enter a name and the program prints the phone number related to it. NB: If the user input a name that doesn't exist, the program should print an error message. Text file example: QT example (input and output) Mark Enter a name : (input) John 8543421233 Mark 3459870093 Emilie 6179873456 3459870093 Phone Number (output)

Answer 1

Code

import sys
from PyQt5 import QtCore, QtWidgets
from PyQt5.QtWidgets import QMainWindow, QWidget, QLabel, QLineEdit
from PyQt5.QtWidgets import QPushButton
from PyQt5.QtCore import QSize  

class MainWindow(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)
        #dict for phonebook
        self.dictionary = {}
        #load data
        self.data()

        self.setMinimumSize(QSize(400, 140))  
        self.setWindowTitle("PhoneBook")

        self.nameLabel = QLabel(self)
        self.nameLabel.setText('Enter a name:')
        self.nameEdit = QLineEdit(self)
        self.nameEdit.move(120, 20)
        self.nameEdit.resize(200, 32)
        self.nameLabel.move(20, 20)

        pybutton = QPushButton('OK', self)
        pybutton.clicked.connect(self.clickMethod)
        pybutton.resize(200,32)
        pybutton.move(120, 60)      

        self.phoneLabel = QLabel(self)
        self.phoneLabel.setText('Phone Number:')
        self.phoneEdit = QLineEdit(self)
        self.phoneEdit.move(120,100)
        self.phoneEdit.resize(200, 32)
        self.phoneLabel.move(15, 100)

    def data(self):
        #open file
        f = open('phonebook.txt', 'r')
        lines = f.readlines()
        keys=[]
        values=[]
        #load keys and values
        for i,j in enumerate(lines):
            if i%2==0:
                keys.append(j.rstrip().lower())
            else:
                values.append(j.rstrip())
        #set data for further use
        self.dictionary = dict(zip(keys,values))

    def clickMethod(self):
        #get name
        name = self.nameEdit.text()
        #self.nameEdit.clear()
        #try to get number
        try :
            #if number exists set number
            number = self.dictionary[name]
            self.phoneEdit.setText(number)
        except KeyError:
            #else set Error text
            self.phoneEdit.setText("No Name exist!")

if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    mainWin = MainWindow()
    mainWin.show()
    sys.exit( app.exec_() )

Screenshots

phonenumber.py X phonenumber.py >... import sys 2 from PyQt5 import QtCore, QtWidgets 3 from PyQt5.QtWidgets import QMainWindow, QWidget, QLabel, QLineEdit 4. from PyQt5.QtWidgets import QPushButton 5 from PyQt5.QtCore import QSize 6 class MainWindow(QMainWindow): def init__(self): QMainWindow. init (self) #dict for phonebook self.dictionary = {} #load data self.data() self.setMinimumSize(QSize (400, 140)) self.setWindowTitle("PhoneBook") 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 self.nameLabel = QLabel(self) self.nameLabel.setText('Enter a name:') self.nameEdit = QLineEdit(self) self.nameEdit.move(120, 20) self.nameEdit.resize (200, 32) self.nameLabel.move(20, 20) pybutton = QPushButton('OK', self) pybutton.clicked.connect(self.clickMethod) pybutton. resize(200,32) pybutton.move(120, 60) self.phoneLabel QLabel(self) self.phoneLabel.setText('Phone Number:') self.phoneEdit = QLineEdit (self) self.phoneEdit.move(120,100) self.phoneEdit.resize(200, 32) self.phoneLabel.move(15, 100)

36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 def data(self): #open file open('phonebook.txt', 'r') lines f.readlines() keys=[] values=[] #load keys and values for i,j in enumerate(lines): if i%2=0 keys.append().rstrip().lower() else: values.append(j.rstrip) #set data for further use self.dictionary dict(zip(keys, values) ) 51 52 53 54 55 56 57 58 59 60 61 62 def clickMethod(self): #get name name = self.nameEdit.text() self.nameEdit.clear() #try to get number try : #if number exists set number number = self.dictionary[name] self.phoneEdit.setText(number) except KeyError: #else set Error text self.phoneEdit.setText("No Name exist!") 63 64 65 if 66 67 68 69 70 name main": app QtWidgets.QApplication(sys.argv) mainwin = MainWindow() mainwin.show() sys.exit( app.exec_0) )

Outputs

Phone Book o x Enter a name: OK Phone Number

Phone Book ох Enter a name: jhon ок Phone Number 8543414221