Inventory software

# Fruit stand log by Morten BEIT KEA18DK
from sys import argv

script, filename = argv

counter = 0
promt = "> "
spend = []
sale = []

target = open(filename, 'a')
def main_menu():
    choice = 0
    print("Fruitmarket Stock software 10.0.1")
    print("Press 1 to add an iten to the inventory")
    print("Press 2 to add an entry for a sale")
    print("Press 3 to see a list of sales and purchases")
    print("Press 4 to exit the program")

main_menu()

choice = input("What would you like to do? ")

while choice!=4:
    if choice==0:
        choice = int(input("What would you like to do? "))

    if choice==1:
        print("What item did you purchase?")
        item = input("Item: ")
        print("Please enter the amount purchased")
        amount = input("Amount: ")
        entry = "Purchase"

        if len(item) >= 8:
            target_formatter = "{0}\t{1}\t\t{2}\n"
            formatted_lines = target_formatter.format(entry, item, amount)
            target.write(formatted_lines)
            choice = 0;
            print("I've added the item to your inventory.")
            print("\n")
            main_menu()

        else:
            target_formatter = "{0}\t{1}\t\t\t{2}\n"
            formatted_lines = target_formatter.format(entry, item, amount)
            target.write(formatted_lines)
            choice = 0;
            print("I've added sale entry to your list")
            print("\n")
            main_menu()

    elif choice==2:
        print("What item did you sell?")
        item = input("Item: ")
        print("How many were sold?")
        amount = input("Amount: ")
        entry = "Sale"
        if len(item) >= 8:
            target_formatter = "{0}\t\t{1}\t\t{2}\n"
            formatted_lines = target_formatter.format(entry, item, amount)
            target.write(formatted_lines)
            choice = 0;
            print("I've added the item to your inventory")
            print("\n")
            main_menu()

        else:
            target_formatter = "{0}\t\t{1}\t\t\t{2}\n"
            formatted_lines = target_formatter.format(entry, item, amount)
            target.write(formatted_lines)
            choice = 0;
            print("I've added the item to your inventory")
            print("\n")
            main_menu()

    elif choice==3:
        print(f"Your current inputs are:")
        target.close()
        my_text = open(filename).read()
        print(my_text, flush=True)
        target = open(filename, 'a')
        choice = 0
        main_menu()

    elif choice==4:
        print("Thank you! Come again.")
        target.close()
        exit()

else:
    print("Please enter a number between 1 and 4")
    print("\n")
    choice = 0
    main_menu()