fruits = ["apple", "banana", "mango"]
numbers = [1, 2, 3, 4, 5]
mixed = ["Ahmed", 22, True, 9.99]  # lists can hold any types

fruits = ["apple", "banana", "mango"]

print(fruits[0])   # apple
print(fruits[1])   # banana
print(fruits[2])   # mango
print(fruits[-1])  # mango — negative index counts from the end

fruits = ["apple", "banana", "mango"]
fruits[1] = "grape"
print(fruits)  # ['apple', 'grape', 'mango']

fruits.append("orange")     # adds to the end
fruits.insert(1, "kiwi")    # adds at index 1

fruits.remove("apple")   # removes by value
fruits.pop()             # removes last item
fruits.pop(0)            # removes item at index 0
del fruits[2]            # deletes item at index 2

if "mango" in fruits:
    print("Found it")

numbers = [3, 1, 4, 1, 5, 9, 2, 6]

print(len(numbers))       # 8 — how many items
print(sorted(numbers))    # [1, 1, 2, 3, 4, 5, 6, 9] — sorted copy
print(numbers.count(1))   # 2 — how many times 1 appears
print(sum(numbers))       # 31 — adds all numbers
print(min(numbers))       # 1
print(max(numbers))       # 9

numbers.reverse()         # reverses in place
numbers.sort()            # sorts in place

fruits = ["apple", "banana", "mango", "grape", "kiwi"]

print(fruits[1:3])   # ['banana', 'mango'] — index 1 to 2
print(fruits[:3])    # ['apple', 'banana', 'mango'] — from start to 2
print(fruits[2:])    # ['mango', 'grape', 'kiwi'] — from index 2 to end

users = ["Ahmed", "Sara", "Ali", "Fatima"]

for user in users:
    print(f"Hello {user}!")

for index, user in enumerate(users):
    print(f"{index + 1}. {user}")

1. Ahmed
2. Sara
3. Ali
4. Fatima

coordinates = (25.2048, 55.2708)  # latitude, longitude
rgb = (255, 0, 0)                 # red color

print(coordinates[0])  # 25.2048

coordinates[0] = 30  # ERROR — tuples are immutable

todos = []

todos.append("Learn Python")
todos.append("Build a Telegram bot")
todos.append("Deploy my first project")

print("Your To-Do List:")
for index, task in enumerate(todos):
    print(f"{index + 1}. {task}")

print(f"Total tasks: {len(todos)}")

user = {
    "name": "Ahmed",
    "age": 22,
    "city": "Dubai",
    "is_admin": False
}

print(user["name"])    # Ahmed
print(user["age"])     # 22

print(user.get("email"))           # None
print(user.get("email", "N/A"))    # N/A — default value

user["email"] = "ahmed@gmail.com"

user["age"] = 23

del user["city"]
user.pop("is_admin")

if "email" in user:
    print("Has email")

print(len(user))  # number of keys

user = {"name": "Ahmed", "age": 22, "city": "Dubai"}

# loop through keys only
for key in user:
    print(key)

# loop through values only
for value in user.values():
    print(value)

# loop through both — most useful
for key, value in user.items():
    print(f"{key}: {value}")

name: Ahmed
age: 22
city: Dubai

users = {
    "ahmed": {
        "age": 22,
        "is_admin": True
    },
    "sara": {
        "age": 19,
        "is_admin": False
    }
}

print(users["ahmed"]["age"])      # 22
print(users["sara"]["is_admin"])  # False

tags = {"python", "bots", "coding", "python"}  # duplicate python
print(tags)  # {'python', 'bots', 'coding'} — duplicate removed

numbers = [1, 2, 2, 3, 3, 3, 4]
unique = list(set(numbers))
print(unique)  # [1, 2, 3, 4]

contacts = {
    "Ahmed": "050-1234567",
    "Sara": "055-7654321",
    "Ali": "052-1112233"
}

# print all contacts
for name, number in contacts.items():
    print(f"{name}: {number}")

# search for a contact
search = input("Search name: ").strip().title()
if search in contacts:
    print(f"Number: {contacts[search]}")
else:
    print("Contact not found")