Writing and retrieving pickled object to a file

Question

I'm doing creating a address book for a computer science class, where we are supposed to have a list of objects "contact" written to a file when the program closes and read from the file when the program starts. However, after the data is written to the file, once it is read it does not seem to keep its object form.

import pickle

class Contact:
                        #Creating the class with the attributes I want
def __init__(self, firstname, lastname, number, areacode, city):
    self.firstname = firstname
    self.lastname = lastname
    self.number = number
    self.areacode = areacode
    self.city = city

def __str__(self):
    return  "({0} {1}, {2}, {3}, {4})".format(self.firstname, self.lastname, self.number, self.areacode, self.city)
                        #reading the object
def opendata():
    readable = []
    addresses = []
    A = open("Address_book", "rb+")
    addresses = A.read()
    A.close
    B = len(addresses)
    if B != 0:
        readable = pickle.loads(addresses)
        return readable
    else:
        return addresses

def savedata(file):
    addresses = open("Address_book", "wb+")
    temp = pickle.dumps(file)
    addresses.write(temp)
    addresses.close()

def Address_manager():
    Address = []
    fromfile = opendata()
    Address.append(fromfile)
    while True:
        print("add = add contact, modify = modify contact, search = search contacts, end = close program, print = print full list")
        A = input("What do you want to do?: ")
        if A == "end":
            savedata(Address)
            break
        else:
            if A == "print":
                for i in Address:
                    print(str(i))
                    print("")
                continue
            elif A == "add":
                Address.append(add_contact())
                print("")
                continue
            elif A == "search":
                lists2 = search_contact(Address)
                A = 0
                for i in lists2:
                    A += 1
                    print(A, str(i))
                    print("")
                print("")
                continue
            elif A == "modify":
                modified = modify_contact(Address)
                Address.append(modified)
                print("")
                continue

def add_contact():
    while True:
        try:
            A = Contact(input("First name: "), input("Last name: "), input("Phone Number: "), input("Area Code: "), input("City: "))
            print(str(A))
            B = input("Is this right?: (y/n)")
            if B == "y":
                print("Well done?")
                return A
            else:
                print("Try Again")
                continue



        except:
            print("bad data")

If I try to "print" the list after getting it from the file it prints them in the wrong form. What am I doing wrong and why?

Edit 1: I apologize for the less than efficient code.

Edit 2: Added function to add contact