💰 Expense Tracker

A simple command-line Python script that lets a user enter expenses one by one and calculates the running total in real time.

Built as part of a Python fundamentals training track — focused on core backend logic: input validation, loops, and the accumulator pattern.

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Features

• ➕ Enter unlimited expenses, one at a time
• 🧮 Live running total after every entry
• 🛡️ Handles invalid input gracefully (no crashes on typos)
• 🔚 Type done anytime to stop and see your final summary
• 📊 Tracks how many expenses were entered

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Demo

=== Expense Tracker ===
Enter your expenses one by one.
Type 'done' when you are finished.

Enter an expense (or type 'done'): 100
Current Total: 100.0
Enter an expense (or type 'done'): 50
Current Total: 150.0
Enter an expense (or type 'done'): abc
Invalid input! Please enter a number.
Enter an expense (or type 'done'): 20
Current Total: 170.0
Enter an expense (or type 'done'): done

=== Total Summary ===
Total Expenses Entered: 3
Total Spent: 170.0

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How to Run

python expense_tracker.py

Requires only Python 3 — no external libraries.

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Code

total = 0
count = 0

print("=== Expense Tracker ===")
print("Enter your expenses one by one.")
print("Type 'done' when you are finished.\n")

while True:
    user_input = input("Enter an expense (or type 'done'): ")

    if user_input.lower() == "done":
        break

    try:
        expense = float(user_input)
    except ValueError:
        print("Invalid input! Please enter a number.")
        continue

    total = total + expense
    count += 1

    print("Current Total:", total)

print("\n=== Total Summary ===")
print("Total Expenses Entered:", count)
print("Total Spent:", total)

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What This Project Demonstrates

Concept	Where it's used
Accumulator pattern	total = total + expense
Input validation	try / except ValueError
Loop control (sentinel value)	while True + break on "done"
State management	total initialized outside the loop

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Tech Stack

• Python 3

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Author

Tabassum Naseer.