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🔰 What Are Lists ?

A list is an ordered collection of items stored in a single variable.

📌 Lists are defined using square brackets [].

🧪 Example :

pythonCopierModifierfruits = ["apple", "banana", "orange"]
print(fruits)

📤 Output:

cssCopierModifier['apple', 'banana', 'orange']

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🧩 Key Properties of Lists:

• ✅ Lists can store different types of data (strings, numbers, etc.).
• ✅ They are mutable (you can change the content).
• ✅ Support looping, updating, and searching.

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📥 Adding Items to a List

pythonCopierModifierfruits.append("grapes")
print(fruits)

🟢 append() adds an item to the end of the list.

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❌ Removing an Item from the List

pythonCopierModifierfruits.remove("banana")
print(fruits)

📌 If the item is not found, it raises an error.

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🗂️ Accessing List Elements:

✅ Using indexing:

pythonCopierModifierprint(fruits[0])   # First item
print(fruits[-1])  # Last item

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🔁 Looping Through a List:

pythonCopierModifierfor fruit in fruits:
    print("I like", fruit)

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🔃 Sorting a List:

pythonCopierModifiernumbers = [5, 1, 9, 3]
numbers.sort()
print(numbers)  # [1, 3, 5, 9]

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🧠 Exercise 1:

Write a program that:

• Creates an empty list.
• Asks the user to enter 3 friend names.
• Adds them to the list.
• Prints the final list.

pythonCopierModifierfriends = []

for i in range(3):
    name = input("Enter a friend's name: ")
    friends.append(name)

print("📋 Your friends are:", friends)

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🔄 Useful List Functions:

Function	Purpose
append(x)	Add item x to the end
remove(x)	Remove item x by value
pop(i)	Remove item at index i
sort()	Sort list in ascending order
reverse()	Reverse the list order
len(list)	Get the number of elements
list.clear()	Remove all elements

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🔍 Searching in a List:

pythonCopierModifierif "banana" in fruits:
    print("🍌 Banana is in the list!")
else:
    print("Banana is not found.")

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🧠 Exercise 2 (Intermediate):

Write a program that:

• Asks the user to enter numbers until they type “exit”.
• Stores them in a list.
• Calculates the sum and average.
• Prints the total number of entries.

pythonCopierModifiernumbers = []

while True:
    entry = input("Enter a number (or type 'exit' to finish): ")
    if entry.lower() == "exit":
        break
    try:
        num = float(entry)
        numbers.append(num)
    except:
        print("⚠️ Please enter a valid number.")

if numbers:
    print("📊 Count:", len(numbers))
    print("🔢 Sum:", sum(numbers))
    print("📈 Average:", sum(numbers) / len(numbers))
else:
    print("No numbers were entered.")

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📝 Summary:

• Lists are powerful for managing collections of data.
• You can add, remove, sort, reverse, and search items easily.
• Lists are used everywhere in real-world Python programs.

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