Now, Let's move to the next topic in the Python Coding Challenge:

*Lists & Tuples*

*What is a List?*

A list is a mutable (changeable) collection of items in a specific order.

*Syntax:*

fruits = [apple, banana, cherry]

print(fruits[0]) Output: apple

fruits.append(mango)

print(fruits) Output: ['apple', 'banana', 'cherry', 'mango']

✅ *You can add, remove, or update elements in a list.*

*What is a Tuple?*

A tuple is similar to a list, but it's immutable (unchangeable once defined).

*Syntax:*

colors = (red, green, blue)
print(colors[1]) Output: green

You cannot modify, append, or remove elements from a tuple after creation.


✅ Key Differences:

*Mutability:*

- List: Mutable — you can change, add, or remove elements after creation.
- Tuple: Immutable — once defined, you cannot change, add, or remove elements.


*Syntax:*

- List: Use square brackets → []

my_list = [1, 2, 3]

- Tuple: Use round brackets → ()

my_tuple = (1, 2, 3)


*Use Case:*

- List: Use when you need to modify the collection later.

- Tuple: Use when the data should remain constant or to ensure integrity.

*Performance:*

Tuple is slightly faster than List due to immutability and fixed size.


*Mini Project: Grocery List Manager*

Let’s build a simple grocery list app where you can:

- Add items

- Remove items

- Display all items

*Python Code:*

grocery_list = []

while True:
print(nOptions: add / remove / show / exit)
action = input(What would you like to do? )

if action == add:
item = input(Enter item to add: )
grocery_list.append(item)
print(fitem added.)

elif action == remove:
item = input(Enter item to remove: )
if item in grocery_list:
grocery_list.remove(item)
print(fitem removed.)
else:
print(Item not found.)

elif action == show:
print(Your grocery list:)
for i in grocery_list:
print(-, i)

elif action == exit:
break

else:
print(Invalid option.)

✅ *Try running this and see how lists work in real time!*

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