📦 Tuples and Immutability — Fixed Collections

Tuples are like lists but immutable—once created, you cannot change them. This makes them perfect for protecting data.

🎯 Creating Tuples

Tuples use parentheses `()` instead of square brackets.

# Create tuples
colors = ("red", "green", "blue")
single_item = ("apple",)  # Note the comma!
coordinates = (10, 20, 30)

# Tuples are immutable
coordinates[0] = 15  # ❌ TypeError: 'tuple' object does not support item assignment

💡 Why Immutability Matters

Immutable means you can't change it after creation. This is useful for:

• **Data protection** — Prevents accidental modifications

• **Dictionary keys** — Lists can't be keys, tuples can

• **Function returns** — Multiple values safely

# A tuple makes a safe "fixed" coordinate
position = (10, 20)

# This works - create a new tuple
position = (15, 25)

# This fails - can't modify
position[0] = 15  # ❌ Error

🎨 Real-World Example: GPS Coordinates

# Store city coordinates (latitude, longitude)
cities = {
    "New York": (40.7128, -74.0060),
    "London": (51.5074, -0.1278),
    "Tokyo": (35.6762, 139.6503)
}

# Access coordinates safely
ny_coords = cities["New York"]
print(f"New York: {ny_coords}")  # (40.7128, -74.0060)

# Tuple unpacking
latitude, longitude = cities["London"]
print(f"Latitude: {latitude}, Longitude: {longitude}")

📊 Tuple vs List

🔑 Key Takeaways

• ✅ Tuples are immutable—cannot change after creation

• ✅ Use parentheses `()` to create tuples

• ✅ Tuples can be dictionary keys

• ✅ Faster and use less memory than lists

• ✅ Perfect for protecting fixed data

Ready to practice? Challenges | Quiz