Bank Teller
In this project you will be implementing code that emulates transactions performed between a bank-teller and a customer.
The prerequisites for this project are Python 3 syntax, functions and control flow. Let’s jump right into it!
1. Initializing savings and checking account values.
Creates two variables, one named checking_balance and the other savings_balance. Assign them both the value of zero. Use these as your starting bank balances.
checking_balance = 0
savings_balance = 0
2. Create a function to check the Balance
step 1. Check account_type and return the respective balance
Define a function named check_balance() that accepts three parameters account_type, checking_balance and savings_balance. account_type represents a string which can either be "savings" or "checking". checking_balance and savings_balancerepresent the respective number balances.
step 2. Check account_type and return the respective balance
Within the function named check_balance(), create an if…elif…else statement. Within each if statement return the customers balance based on the type of account_type they requested.
step 3. Assigning the savings_balance
Within the first if statement use an equal operator to check whether account_type is the same as "savings". If that is true, set the new variable balance to the value of savings_balance.
step 4. Assigning the checking_balance
Within the second elif statement use an equal operator to check whether account_type is the same as "checking". If that is true, set the variable balance to the value of checking_balance.
step 5. Return an error statement if there are no matching account_type
Within the else statement, return an error statement given that there were no matches for the previous if...elif statements. Within the else statement, return "Unsuccessful, please enter \"checking\" or \"savings\""
step 6. Create a balance statement
Under the if statements, create a new variable called balance_statement and assign it a value that consists of strings and variables. Concatenate the variables account_type and balance into the account statement. Remember to cast balance to a string using str() in the statement. The statement should be: "Your account_type balance is balance".
step 7. Return balance statement
Under the balance_statement assignment, close out the check_balance() function by adding a return statement that returns the balance_statement variable.
def check_balance(account_type, checking_balance, savings_balance):
if account_type == "savings":
balance = savings_balance
balance_statement = "Your" + account_type + "balance is " + str(balance) + "."
return balance_statement
elif account_type == "checking":
balance = checking_balance
balance_statement = "Your" + account_type + "balance is " + str(balance) + "."
return balance_statement
else:
return "Unsuccessful, please enter \"checking\" or \"savings\""
3. Calling and Printing the check_balance() function for Checking Account
Now that you have completed the check_balance() function, call it inside a print() function. Call the check_balance() function with these arguments; "checking", checking_balance and savings_balance. The latter two were already initialized at the start of the project. Your checking balance should print.
print(check_balance("checking",checking_balance,savings_balance))
Yourcheckingbalance is 0.
4. Calling and Printing the check_balance() function for Savings Account
On the next line, inside a print() function call the check_balance() function with these arguments; "checking", checking_balance and savings_balance. Your savings balance should print.
print(check_balance("savings",checking_balance,savings_balance))
Yoursavingsbalance is 0.
5. Create a function to make a deposit
step 1. define function
Define a function named make_deposit() that accepts four parameters account_type, amount, checking_balance and savings_balance. The amount represents the amount to be deposited.
step 2. Initialize deposit_status variable
Inside the deposit function, start by creating a variable named deposit_status and assign it to a an empty string
step 3. Ensure deposit is greater than 0
Write an if statement that checks whether the passed in amount is greater than 0. Step 5 will continue putting code inside this if statement if amount is greater than 0.
step 4. Error if amount is less than 0
Write a corresponding else statement if the if statement fails. Within that else, assign the variable deposit_status to the string value "unsuccessful, please enter an amount greater than 0"
step 5. Checking account_type
Within the if statement that ensures that the amount is greater than 0, write inner if...elif...else statements. Within each if statement add the passed in amount to the customers balance based on the type of account_type they requested and also set deposit_status to "successful" or an error message.
step 6. Deposit to Savings account
Within the first nested if statement check whether account_type is equivalent to "savings". Then within this if statement on the next line add amount to savings_balance using the += assignment operator. On the next line assign the string value "successful" to the variable deposit_status.
step 7. Deposit to Checking account
Within the next nested elif statement check whether account_type is equivalent to "checking". Then within this elif statement on the next line add amount to checking_balance using the += assignment operator. On the next line assign the string value "successful" to the variable deposit_status.
step 8. Assign an error statement if there are no matching account_type
Within the next nested else statement, assign the string value "Unsuccessful, please enter \"checking\" or \"savings\"" to the variable deposit_status.
step 9. Create a deposit statement
Outside of all the if statements but still in the function, compose a statement composing of strings and variables used in this function. Then assign it to the new deposit_statement variable. The statement should be: "Deposit of amount to your account_type account was deposit_status".
step 10. Print deposit statement
On the next line, write a print statement with the deposit_statement as an argument. This will print the deposit statement anytime the deposit function is called.
step 11. Return savings_balance and checking_balance
On the next line return both the savings_balance and checking_balance. This will conclude the make_deposit() function.
def make_deposit(account_type,amount,checking_balance,savings_balance):
deposit_status = ""
if amount > 0:
if account_type == "savings":
savings_balance += amount
deposit_status = "successful"
elif account_type == "checking":
checking_balance += amount
deposit_status = "successful"
else:
deposit_status = "Unsuccessful, please enter \"checking\" or \"savings\""
else:
deposit_status = "unsuccessful, please enter an amount greater than 0"
deposit_statement = "Deposit of amount to your " + account_type + " account was " +deposit_status
print(deposit_statement)
return savings_balance,checking_balance
6. Call deposit function and make a savings deposit
On the next line, call the make_deposit() function with these arguments; "savings", 10,checking_balance and savings_balance. Assign the function call to the matching checking_balance and savings_balance variables that are also being returned by the function. That is how the new balances are being updated.
savings_balance,checking_balance = make_deposit("savings",10,checking_balance,savings_balance)
Deposit of amount to your savings account was successful
7. Print savings balance call after making a savings deposit
Now that a deposit has been made to the savings account, print your savings balance. Call the check_balance() function with these arguments; "savings", checking_balance and savings_balance within a print function. Your new savings balance should print.
print(check_balance("savings",checking_balance,savings_balance))
Yoursavingsbalance is 10.
8. Call deposit function and make a checking deposit
On the next line, call the make_deposit() function with these arguments; "checking", 200,checking_balance and savings_balance. Assign the function call to the matching checking_balance and savings_balance variables that are also being returned by the function.
savings_balance,checking_balance = make_deposit("checking",200,checking_balance,savings_balance)
Deposit of amount to your checking account was successful
9. Print checking balance call after making a checking deposit
Now that a deposit has been made to the checking account, print our new checking balance. Call the check_balance() function with these arguments; "checking", checking_balance and savings_balance within a print function. Your new checking balance should print.
print(check_balance("checking",checking_balance,savings_balance))
Yourcheckingbalance is 200.
10. Create a function to make a withdrawal
step 1. define function
Define a function named make_withdrawal() that accepts four parameters account_type, amount, checking_balance and savings_balance. The amount represents the withdrawal amount.
step 2. Initialize withdrawal_status variable
Inside the withdrawal function, start by creating a variable named withdrawal_status and assign it to an empty string.
step 3. Initialize an error message
On the next line create a variable named fail and assign it to the value "Unsuccessful, please enter amount less than balance"
step 4. Checking account_type
Write if...elif...else statements. Within each if statement check whether the account_type is equivalent to savings_balance or checking_balance. If neither, throw an error in the else statement.
step 5. Withdrawal from savings account
The first if statement should check whether account_type is equivalent to "savings".
step 6. Ensure withdrawal is less than savings account
Then write an inner if...else that checks if the withdrawal amount is greater than the savings balance. If the amount is indeed greater, in the else statement, assign withdrawal_status to the variable fail.
step 7. Subtract amount from savings account
Within the inner if statement, subtract amount from the savings_balance using the -= assignment operator. On the next line assign the string value "successful" to the variable withdrawal_status.
step 8. Withdrawal from checking account
The next elif statement should check whether account_type is equivalent to "checking".
step 9. Ensure withdrawal is less than checking account
Then write an inner if...else that checks if the withdrawal amount is greater than the checking balance. If the amount is indeed greater, in the else statement, assign withdrawal_status to the variable fail.
step 10. Subtract amount from checking account
Within the inner if statement, subtract amount from the checking_balance using the -= assignment operator. On the next line assign the string value "successful" to the variable withdrawal_status.
step 11. Assign an error statement if there are no matching account_type
Within the last else statement, assign the string value "unsuccessful, please enter \"checking\" or \"savings\"" to the variable withdrawal_status.
step 12. Create a withdrawal statement
Outside of all the if statements but still in the function, create a statement composing of strings and variables used in this function. Then assign it to the new withdrawal_statement variable. The withdrawal statement should be: "Withdrawal of amount dollars from your account_type was withdrawal_status".
step 13. Print withdrawal statement
On the next line, write a print statement with the withdrawal_statement as an argument. This will print the withdrawal statement anytime the deposit function is called.
step 14. Return savings_balance and checking_balance
On the next line return both the savings_balance and checking_balance. This will conclude the make_withdrawal() function.
def make_withdrawal(account_type,amount,checking_balance,savings_balance):
withdrawal_status = ""
fail = "Unsuccessful, please enter amount less than balance"
if account_type == "savings":
if amount <= savings_balance:
savings_balance -= amount
withdrawal_status = "successful"
else:
withdrawal_status = fail
elif account_type == "checking":
if amount <= checking_balance:
checking_balance -= amount
withdrawal_status = "successful"
else:
withdrawal_status = fail
else:
withdrawal_status = "Unsuccessful, please enter \"checking\" or \"savings\""
withdrawal_statement = "withdrawal of " + str(amount) + " Dollars from your " +account_type+ " was " + withdrawal_status
print(withdrawal_statement)
return savings_balance,checking_balance
11. Call withdrawal function and make a savings withdrawal
On the next line, call the make_withdrawal() function with these arguments: "savings", 11,checking_balance and savings_balance. Assign the function call to the matching checking_balance and savings_balance variables that are also being returned by the function. That is how the new balances are being updated.
savings_balance,checking_balance = make_withdrawal("savings",11,checking_balance,savings_balance)
withdrawal of 11 Dollars from your savings was Unsuccessful, please enter amount less than balance
12. Print savings balance call, after making a savings withdrawal
Now that a withdrawal has been made from the savings account, print our savings balance. Call the check_balance() function with these arguments; "savings", checking_balance and savings_balance within a print function. Your new savings balance should print.
print(check_balance("savings",checking_balance,savings_balance))
Yoursavingsbalance is 10.
13. Call withdrawal function and make a checking withdrawal
On the next line, call the make_withdrawal() function with these arguments; "checking", 170,checking_balance and savings_balance. Assign the function call to the matching checking_balance and savings_balance variables that are also being returned by the function. That is how the new balances are being updated.
savings_balance,checking_balance = make_withdrawal("checking",170,checking_balance,savings_balance)
withdrawal of 170 Dollars from your checking was successful
14. Print checking balance call, after making a checking withdrawal
Now that a withdrawal has been made from the checking account, print our checking balance. Call the check_balance() function with these arguments; "savings", checking_balance and savings_balance within a print function. Your new checking balance should print.
print(check_balance("checking",checking_balance,savings_balance))
Yourcheckingbalance is 30.
15. Create a function to make a transfer between accounts
step 1. define function
Define a function named acc_transfer() that accepts five parameters acc_from, acc_to, amount, checking_balance and savings_balance.
step 2. Initialize trans_status variable
Inside the transfer function, start by creating a variable named trans_status and assign it to a an empty string.
step 3. Initialize an error message
On the next line create a variable named trans_error and assign it to the value "unsuccessful, please enter amount less than "
step 4. Account Transfer
Write if...elif...else statements. The if statement will check if the transfer is from savings to checking account. The elif statement will check if the transfer is from checking to savings account. If neither, throw an error in the else statement.
step 5. Ensure transfer is less than savings account
Within the first if statement, write an inner if...else that checks if the transfer amount is greater than the savings balance. If the amount is indeed greater, in the else statement, assign trans_status to the variable trans_error + str(savings_balance).
step 6. Transfer amount from savings to checking account
Within the inner if statement, subtract amount from the savings_balance using the -= assignment operator. On the next line, add amount to the checking_balance using the += assignment operator. Then on the next line assign the string value "successful" to the variable withdrawal_status.
step 7. Ensure transfer is less than checking account
Within the following elif statement, write an inner if...else that checks if the transfer amount is greater than the savings balance. If the amount is indeed greater, in the else statement, assign trans_status to the variable trans_error + str(checking_balance).
step 8. Transfer amount from checking to savings account
Within the inner if statement, subtract amount from the checking_balance using the -= assignment operator. On the next line, add amount to the savings_balance using the += assignment operator. Then on the next line assign the string value "successful" to the variable withdrawal_status.
step 9. Assign an error statement if there are no matching account_type
Within the last else statement, assign the string value "unsuccessful, please enter \"checking\" or \"savings\"" to the variable trans_status.
step 10. Create a transfer statement
Outside of all the if statements but still in the function, compose a statement composing of strings and variables used in this function. Then assign it to the new trans_statement variable. The transfer statement should be; "transfer of amount from your cc_from to your acc_to account was trans_status".
step 11. Print transfer statement
On the next line, write a print statement with the trans_statement as an argument. This will print the transfer statement anytime the transfer function is called.
step 12. Return savings_balance and checking_balance
On the next line return both the savings_balance and checking_balance. This will conclude the acc_transfer() function.
def acc_transfer(acc_from,acc_to,amount,checking_balance,savings_balance):
trans_status = ""
trans_error = "unsuccessful, please enter amount less than "
if acc_from == "savings":
if amount <= savings_balance:
savings_balance -= amount
checking_balance += amount
trans_status = "successful"
else:
trans_status = trans_error + str(savings_balance)
elif acc_from == "checking":
if amount <= checking_balance:
checking_balance -= amount
savings_balance += amount
trans_status = "successful"
else:
trans_status = trans_error + str(savings_balance)
else:
trans_status = "unsuccessful, please enter \"checking\" or \"savings\""
trans_statement = "transfer of " + str(amount) + " from your " + acc_from + " to your " + acc_to + " account was " + trans_status
print(trans_statement)
return savings_balance,checking_balance
16. Call transfer function and make a checking to savings transfer
On the next line, call the acc_transfer() function with these arguments; "checking", "savings", 40,checking_balance and savings_balance. Assign the function call to the matching checking_balance and savings_balance variables that are also being returned by the function.
savings_balance,checking_balance = acc_transfer("checking","savings",40,checking_balance,savings_balance)
transfer of 40 from your checking to your savings account was unsuccessful, please enter amount less than 10
17. Print checking balance after making a checking to savings transfer
Now that a transfer has been made from the checking to savings account, print your checking balance. Call the check_balance() function with these arguments; "checking", checking_balance and savings_balance within a print function. Your new checking balance should print.
print(check_balance("checking",checking_balance,savings_balance))
Yourcheckingbalance is 30.
18. Print savings balance after making a checking to savings transfer
Now that a transfer has been made from the checking to savings account, print your savings balance. Call the check_balance() function with these arguments; "savings", checking_balance and savings_balance within a print function. Your new savings balance should print.
print(check_balance("savings",checking_balance,savings_balance))
Yoursavingsbalance is 10.
19. Call transfer function and make a savings to checking transfer
On the next line, call the acc_transfer() function with these arguments; "savings", "checking", 5,checking_balance and savings_balance. Assign the function call to the matching checking_balance and savings_balance variables that are also being returned by the function. That is how the new balances are being updated.
savings_balance,checking_balance = acc_transfer("savings","checking",5,checking_balance,savings_balance)
transfer of 5 from your savings to your checking account was successful
20. Print checking balance after making a savings to checking transfer
Now that a transfer has been made from the savings to checking account, print your checking balance. Call the check_balance() function with these arguments; "checking", checking_balance and savings_balance within a print function. Your new checking balance should print.
print(check_balance("checking",checking_balance,savings_balance))
Yourcheckingbalance is 35.
21. Print saving balance after making a savings to checking transfer
Now that a transfer has been made from the savings to checking account, print your saving balance. Call the check_balance() function with these arguments; "savings", checking_balance and savings_balance within a print function. Your new saving balance should print.
print(check_balance("savings",checking_balance,savings_balance))
Yoursavingsbalance is 5.
22. Conclusion
Congrats on completing a simple Python for Finance off-platform project. Feel free to change the variables to test the different possible outcomes.