Question

# This program simulates a single transaction -
# either a deposit or a withdrawal - at a bank.
balance = 1000
type_of_transaction = input("Deposit or Withdrawl:")
amount=int(input("Enter Amount: $"))
if type_of_transatiction == "Deposit":
balance=balance+amount
elif type_of_transatiction == "Withdrawal":
balance=balance-amount
else:
print("Invalid Transaction.")

Answer 1

Here is a corrected, slightly improved version and a short explanation of the fixes:

Fixed code:
balance = 1000
type_of_transaction = input("Deposit or Withdrawal: ").strip().lower()
try:
amount = int(input("Enter amount: $"))
if amount < 0:
raise ValueError
except ValueError:
print("Invalid amount.")
else:
if type_of_transaction == "deposit":
balance += amount
print(f"Deposited ${amount}. New balance: ${balance}")
elif type_of_transaction == "withdrawal":
if amount > balance:
print("Insufficient funds.")
else:
balance -= amount
print(f"Withdrew ${amount}. New balance: ${balance}")
else:
print("Invalid transaction.")

What I fixed and improved:
- Corrected the variable-name typo (type_of_transatiction -> type_of_transaction).
- Corrected the prompt spelling ("Withdrawl" -> "Withdrawal").
- Made transaction input case-insensitive with .strip().lower().
- Added input validation for amount (non-integer and negative checks).
- Handled insufficient funds on withdrawal.
- Printed the updated balance after a successful transaction.

If you want, I can show a version that loops for multiple transactions or that persists balance between runs.