Python Example 1

# Kaizer here. I created a banking system, which allows you to create your own account, withdraw money, input account numbers, initial balance, and so on and so forth.

# class to represent a bank account
class Account:
    def __init__(self, acc_number, acc_holder, initial_balance):
        self.account_number = acc_number
        self.account_holder = acc_holder
        self.balance = initial_balance

    # function to find an already existing account number
    def get_account_number(self):
        return self.account_number

    # function to deposit money into the account
    def deposit(self, amount):
        if amount > 0:
            self.balance += amount
            print(f"Deposited: {amount}")
        else:
            print("Invalid deposit amount.")

    # function to withdraw money from the account
    def withdraw(self, amount):
        if amount > 0 and amount <= self.balance:
            self.balance -= amount
            print(f"Withdrew: {amount}")
        else:
            print("Invalid withdrawal amount or insufficient funds.")

    # function to check the account balance
    def get_balance(self):
        return self.balance

    # function to display account details
    def display(self):
        print(f"Account Number: {self.account_number}")
        print(f"Account Holder: {self.account_holder}")
        print(f"Balance: {self.balance}")

# public Class to manage multiple accounts
class Bank:
    def __init__(self):
        self.accounts = []

    # function to create a new account
    def create_account(self, acc_number, acc_holder, initial_balance):
        self.accounts.append(Account(acc_number, acc_holder, initial_balance))
        print("Account created successfully.")

    # function to find an account by account number
    def find_account(self, acc_number):
        for account in self.accounts:
            if account.get_account_number() == acc_number:
                return account
        return None

    # function to display all accounts
    def display_all_accounts(self):
        for account in self.accounts:
            account.display()
            print("-------------------")

def main():
    bank = Bank()
    while True:
        print("1. Create Account")
        print("2. Deposit")
        print("3. Withdraw")
        print("4. Check Balance")
        print("5. Display All Accounts")
        print("6. Exit")
        choice = input("Enter your choice: ")

        if choice == '1':
            acc_number = input("Enter account number: ")
            acc_holder = input("Enter account holder name: ")
            amount = float(input("Enter initial balance: "))
            bank.create_account(acc_number, acc_holder, amount)
        elif choice == '2':
            acc_number = input("Enter account number: ")
            account = bank.find_account(acc_number)
            if account:
                amount = float(input("Enter amount to deposit: "))
                account.deposit(amount)
            else:
                print("Account not found.")
        elif choice == '3':
            acc_number = input("Enter account number: ")
            account = bank.find_account(acc_number)
            if account:
                amount = float(input("Enter amount to withdraw: "))
                account.withdraw(amount)
            else:
                print("Account not found.")
        elif choice == '4':
            acc_number = input("Enter account number: ")
            account = bank.find_account(acc_number)
            if account:
                print(f"Balance: {account.get_balance()}")
            else:
                print("Account not found.")
        elif choice == '5':
            bank.display_all_accounts()
        elif choice == '6':
            print("Exiting...")
            break
        else:
            print("Invalid choice. Please try again.")

if __name__ == "__main__":
    main()