Answer
code
Work Step by Step
# 13.15 (Tkinter: address book) Rewrite the address book case study in Section 13.11 with
# the following improvements, as shown in Figure 13.13:
# (a) Add a new button named Update. Clicking it enables the user to update the
# address that is currently displayed.
# (b) Add a label below the buttons to display the current address location and the
# total number of addresses in the list.
# (c) Implement the unfinished processPrevious and processLast methods in
# Listing 13.19.
import pickle
import os.path
from tkinter import * # Import tkinter
import tkinter.messagebox
class Address:
def __init__(self, name, street, city, state, zip):
self.name = name
self.street = street
self.city = city
self.state = state
self.zip = zip
class AddressBook:
def __init__(self):
window = Tk() # Create a window
window.title("AddressBook") # Set title
self.nameVar = StringVar()
self.streetVar = StringVar()
self.cityVar = StringVar()
self.stateVar = StringVar()
self.zipVar = StringVar()
self.lblVar = StringVar()
frame1 = Frame(window)
frame1.pack()
Label(frame1, text="Name").grid(row=1,
column=1, sticky=W)
Entry(frame1, textvariable=self.nameVar,
width=40).grid(row=1, column=2)
frame2 = Frame(window)
frame2.pack()
Label(frame2, text="Street").grid(row=1,
column=1, sticky=W)
Entry(frame2, textvariable=self.streetVar,
width=40).grid(row=1, column=2)
frame3 = Frame(window)
frame3.pack()
Label(frame3, text="City", width=5).grid(row=1,
column=1, sticky=W)
Entry(frame3,
textvariable=self.cityVar).grid(row=1, column=2)
Label(frame3, text="State").grid(row=1,
column=3, sticky=W)
Entry(frame3, textvariable=self.stateVar,
width=5).grid(row=1, column=4)
Label(frame3, text="ZIP").grid(row=1,
column=5, sticky=W)
Entry(frame3, textvariable=self.zipVar,
width=5).grid(row=1, column=6)
frame4 = Frame(window)
frame4.pack()
Button(frame4, text="Add",
command=self.processAdd).grid(row=1, column=1)
btFirst = Button(frame4, text="First",
command=self.processFirst).grid(row=1, column=2)
btNext = Button(frame4, text="Next",
command=self.processNext).grid(row=1, column=3)
btPrevious = Button(frame4, text="Previous", command=
self.processPrevious).grid(row=1, column=4)
btLast = Button(frame4, text="Last",
command=self.processLast).grid(row=1, column=5)
btUpdate = Button(frame4, text="update", command=self.processUpdate).grid(row=1, column=6)
self.lblVar = StringVar()
self.lbl = Label(window,text=self.lblVar.get())
self.lbl.pack()
self.addressList = self.loadAddress()
self.current = 0
if len(self.addressList) > 0:
self.setAddress()
self.updateLbl()
window.mainloop() # Create an event loop
def saveAddress(self):
outfile = open("address.dat", "wb")
pickle.dump(self.addressList, outfile)
tkinter.messagebox.showinfo(
"Address saved", "A new address is saved")
outfile.close()
self.updateLbl()
def loadAddress(self):
if not os.path.isfile("address.dat"):
return [] # Return an empty list
try:
infile = open("address.dat", "rb")
addressList = pickle.load(infile)
except EOFError:
addressList = []
infile.close()
return addressList
def processAdd(self):
address = Address(self.nameVar.get(),
self.streetVar.get(), self.cityVar.get(),
self.stateVar.get(), self.zipVar.get())
self.addressList.append(address)
self.saveAddress()
def processFirst(self):
self.current = 0
self.setAddress()
def processNext(self):
if self.current < len(self.addressList) - 1:
self.current += 1
self.setAddress()
def processPrevious(self):
if self.current >= 1:
self.current -= 1
self.setAddress()
def processLast(self):
self.current = len(self.addressList) - 1
self.setAddress()
def setAddress(self):
self.nameVar.set(self.addressList[self.current].name)
self.streetVar.set(self.addressList[self.current].street)
self.cityVar.set(self.addressList[self.current].city)
self.stateVar.set(self.addressList[self.current].state)
self.zipVar.set(self.addressList[self.current].zip)
self.updateLbl()
def processUpdate(self):
self.addressList[self.current].name = self.nameVar.get()
self.addressList[self.current].street = self.streetVar.get()
self.addressList[self.current].city = self.cityVar.get()
self.addressList[self.current].state = self.stateVar.get()
self.addressList[self.current].zip = self.zipVar.get()
self.saveAddress()
def updateLbl(self):
val = "Current Address: "+str(self.current)+". The total number: "+str(len(self.addressList))
self.lblVar.set(val)
self.lbl.configure(text=self.lblVar.get())
AddressBook() # Create GUI
