Add a pickle to a program with loop

Question

I'm trying to run a program of a bank account (it's not the whole program). I want that the data of the users and the transactions will be saved for the next time the user ton the program. how can I do the pickling here on the two top dictionaries?

import pickle
from datetime import datetime
import collections
all_bank_accounts = {}
all_bank_accounts_actions = {}
class BankAccount():
    def __init__(self, first_name, last_name, personal_number,currency, amount = 0):
        self.first_name = first_name
        self.last_name = last_name
        self.personal_number = personal_number
        self.currency = currency
        self.amount = amount
        self.counter_of_transactions = 0
    
    def balance_check_in_the_bank_account(self):
        print('The amount of money in the bank is:\n', self.amount)
        
        
    def cash_deposit(self, amount_of_deposit):
        self.amount_of_deposit = amount_of_deposit
        self.amount += amount_of_deposit
        self.now = datetime.now()
        self.dt_string = self.now.strftime("%d/%m/%Y, %H:%M:%S")
        self.date_and_amount = [self.dt_string, self.amount_of_deposit]
        cd = f"You have just deposited an amount of {self.amount_of_deposit}{self.currency}. \nyou currently have {self.amount}{self.currency} in your account."
        print(cd)
        self.counter_of_transactions += 1
        return self.date_and_amount
    
    
    def file_of_transactions(self, the_list_of_transactions2):
        self.the_list_of_transactions = the_list_of_transactions2
        self.the_string_data =f"{self.first_name} {self.last_name} {self.personal_number}, balance: {self.amount}{self.currency}\n" 
        with open(f"{self.personal_number}.txt", "w") as the_file:
            the_file.write(self.the_string_data)
            for a,b in zip(self.the_list_of_transactions[::2], self.the_list_of_transactions[1::2]):
                the_string_transaction = f"{a} {b}{self.currency}\n"
                print(the_string_transaction)
                the_file.write(the_string_transaction)
                
while True:
    cmd = int(input(" Press 1 to create a bank account or Press 2 to other options:\n"))        
    if cmd == 1:
        first_namee = input("What is your first name? ")
        last_namee = input("What is your last name? ")
        personal_numberr = input("What is your ID? ")
        currencyy = input("What type of currncey would you like to use? ")
        amountt = int(input("What is the amount of money would you like to deposit? "))    
        the_account = BankAccount(first_namee, last_namee, personal_numberr, currencyy, amountt)
        all_bank_accounts[personal_numberr] = the_account
        print(all_bank_accounts)
        
    else:
        personal_numberr = input("What is your ID? ")
        if personal_numberr in all_bank_accounts.keys():
            cmd = int(input(" Press 2 to check in the bank account.\n Press 3 to deposit cash.\n Press 7 to print an account details page .\n"))        
            if cmd == 2:
                all_bank_accounts[personal_numberr].balance_check_in_the_bank_account()
            elif cmd == 3:
                input_deposit = int(input('How much would you like to deposit?\n'))
                return_deposit = all_bank_accounts[personal_numberr].cash_deposit(input_deposit)
                if personal_numberr in all_bank_accounts_actions:
                     all_bank_accounts_actions[personal_numberr].extend(return_deposit)
                else:
                     all_bank_accounts_actions[personal_numberr] = return_deposit
            
            elif cmd == 7:
                all_bank_accounts[personal_numberr].file_of_transactions(all_bank_accounts_actions[personal_numberr][:])
                
        
        else:
            print("The bank account not exist")