How can I improve this shopping_list? Does it make sense to improve my shopping_list with Object-Oriented Python?

import os

shopping_list_ie = [{"apples": [0.30, "Tesco Metro", "Victoria Centre"]},
                         {"mushrooms": [1.80, "Tesco Express", "Upper Parliament Street"]}]

# import list
try:
    with open('shopping_list_2.txt', 'r') as b:
        shopping_list = b.read().splitlines()
    for item in shopping_list:
        shopping_list[shopping_list.index(item)] = shopping_list[shopping_list.index(item)].split(", ")
    for item in shopping_list:
        shopping_list[shopping_list.index(item)] = {item[0]: [float(item[1]), item[2], item[3]]}
except FileNotFoundError:
    # if there's no saved list
    shopping_list = shopping_list_ie
except IndexError:
    shopping_list = shopping_list_ie

# help
def show_help():
    print("""
    allowed keys:
        help
        save
        show (all or single object)
        quit
    """)


def clear_screen():
    os.system("cls" if os.name == "nt" else "clear")

# show list or single objects
def show_list():
    all_single = input("[A]ll or a [S]ingle object? > ").lower()
    if all_single == "a":
        for item in shopping_list:
            print(item)
    elif all_single == "s":
        quale = input("object name > ")
        for item in shopping_list:
            if quale in item.keys():
                print(item)

# save list
def extract(item):
    for key, value in item.items():
        oggetto = [key, value]
        return oggetto

def save_list():
    with open('shopping_list_2.txt', 'w') as a:
        for items in shopping_list:
            items = str(items)
            items = items.replace("[", "")
            items = items.replace("]", "")
            items = items.replace("'", "")
            a.write(items + "\n")

# ask for place and address
def luogo():
    market_name = input("Where did you do shopping today? Enter market name > ").lower()
    luogo = input("Enter market address > ").lower()
    return [market_name, luogo]


dove = luogo()
show_help()

while True:
    print("")
    # ask for object
    oggetto = input("Enter object [es. apples] > ").lower()

    if oggetto == "show":
        clear_screen()
        show_list()
        continue
    elif oggetto == "help":
        clear_screen()
        show_help()
        continue
    elif oggetto == "quit":
        fake_list = []
        for item in shopping_list:
            fake_list += [extract(item)]
            shopping_list = fake_list
        save_list()
        clear_screen()
        print("saved! See you")
        break
    elif oggetto == "save":
        fake_list = []
        for item in shopping_list:
            fake_list += [extract(item)]
            shopping_list = fake_list
        save_list()
        print("saved")
        continue

    # ask for price
    prize = float(input("Enter prize [es. 1.00] > "))

    oggetti = []
    for item in shopping_list:
        oggetti += item.keys()

    for item in oggetti:
        if item.lower() == oggetto:
            # if more expensive, show object and ask for replace
            selezione_dict = shopping_list[oggetti.index(item)]
            if selezione_dict[item][0] < prize: 
                print(shopping_list[oggetti.index(item)])
                rimpiazzo = input("More expensive, replace anyway? [Y/n] > ").lower()
                if rimpiazzo == "n":
                    print("listed object unchanged!")
                    continue
                elif rimpiazzo == "y":
                    market, luogo = dove
                    shopping_list[oggetti.index(item)] = {oggetto : [prize, market, luogo]}
                    print("Replaced!")
                    continue
            else:
                # if cheaper show object and ask for replace
                print(shopping_list[oggetti.index(item)])
                rimpiazzo = input("Cheaper! Replace? [Y/n] > ").lower()
                if rimpiazzo == "n":
                    print("listed object unchanged!")
                    continue
                elif rimpiazzo == "y":
                    market, luogo = dove
                    shopping_list[oggetti.index(item)] = {oggetto : [prize, market, luogo]}
                    print("Replaced!")
                    continue
    # if object not listed, add to the list with place and address
    if oggetto not in oggetti:
        aggiungo = input("Not listed item! Add? [Y/n] > ").lower()
        if aggiungo == "n":
            print("object not added")
            continue
        elif aggiungo == "y":
            market, luogo = dove
            shopping_list.append({oggetto : [prize, market, luogo]});