Lecture: If conditional statement:

age = input('Enter your age')
age = int(age)

if age>=18:
    print('You are an adult')
else:
    print('You are not an adult')

Lecture: Elif statement

marks = int(input('Enter marks'))

if marks>=90:
    print('Grade A')
elif marks >=70:
    print('Grade B')
elif marks >=60:
    print('Grade C')
elif marks<60:
    print('Grade D')

Lecture: Nested IF

Explain the below example in detail:

age = int(input('Enter your age'))
if age>=18:
    score = int(input('Enter your exam score'))
    if score>=40:
        print('You meet both the age and score criteria and are qualified for the post')
    else:
        print('You meet the age criteria but not the score criteria, disqualified')
else:
    print('You do not meet the age criteria, try when you are above 18 ')

Lecture: Range function

numbers =[1,2,3,4,5,6,7,8,9,10]

Using range

numbers =list(range(10))
print(numbers)

List of numbers from 1-9

numbers =list(range(1,10))

List of numbers from 1 to 10

numbers =list(range(1,11))

List of 100 numbers

numbers =list(range(1,101))
print(numbers)

Range function takes two parameters

range(start,stop)

Additional parameter called as step

range(start,stop,step)

Using step.

range(1,101,3)

Lecture: For loop

for x in range(1,10):
    print (x)

for x in range(1,10):
    print (x)

Lecture: Iterating list of items

Loop through a list of items

fruits = ['apple','mango','banana','orange']

for x in fruits:
    print(x)

Lecture: Iterating a dictionary

people={"John":32,"Rob":40,"Tim":20}

# To get access to keys
for x in people:
    print(x)

#To get access to values
for x in people:
    print(people[x])

Lecture: While loop

counter = 0

while counter<=10:
    print(counter)
    counter = counter + 1

Lecture: Break

counter = 0

while counter<=10:

    counter = counter + 1
    if counter == 5:
        break
    print(counter)
# The below line will be executed Because break stops the loop from executing,
#not the entire program
print('Line after break')

Lecture: Continue

counter = 0

while counter<=10:

    counter = counter + 1
    if counter == 5:
        continue
    print(counter)
print('Line after continue')

Lecture: Adding items to cart using loop

# Let's say we want to create a shopping cart
cart = []

# Accept the number of items we want
n = int(input("Enter the number of items: "))

for x in range(n):
    item = input("Enter the item to add to the cart: ")
    cart.append(item)
    print(cart)

# This code now accepts multiple items and adds them to the cart.

Lecture: Adding items using while loop

cart = []

while True:
    choice = input("Do you want to add an item to the cart? ")
    if choice == "yes":
        item = input("Enter the item you want to add: ")
        cart.append(item)
        print(f"Current cart contents are: {cart}")
    else:
        break

print(f"Thank you! Your final cart contents are: {cart}")

Lecture: Creating a list of products & adding items to cart

products = [
    {"name": "Smartphone", "price": 500, "description": "A handheld device used for communication and browsing the internet."},
    {"name": "Laptop", "price": 1000, "description": "A portable computer that is easy to carry around."},
    {"name": "Headphones", "price": 50, "description": "A pair of earphones worn over the head to listen to music."},
    {"name": "Smartwatch", "price": 300, "description": "A wearable device used for fitness tracking and receiving notifications."},
    {"name": "Bluetooth speaker", "price": 100, "description": "A portable speaker that connects wirelessly to devices using Bluetooth technology."}
]
cart = []

while True:
    choice = input("Do you want to continue shopping? ")

    if choice == "y":
        print("Here is a list of products and their prices:")
        for index, product in enumerate(products):
            print(f"{index}: {product['name']}: {product['description']}: ${product['price']}")
        product_id = int(input("Enter the ID of the product you want to add to the cart: "))
        cart.append(products[product_id])
        print(f"Current cart contents are: {cart}")
    else:
        break

print(f"Thank you! Your final cart contents are: {cart}")

Lecture: Displaying cart items

print("Here are the contents in your cart:")
for product in cart:
    print(f"{product['name']}: ${product['price']}")

Lecture: Incrementing the quantity

products = [
    {"name": "Smartphone", "price": 500, "description": "A handheld device used for communication and browsing the internet."},
    {"name": "Laptop", "price": 1000, "description": "A portable computer that is easy to carry around."},
    {"name": "Headphones", "price": 50, "description": "A pair of earphones worn over the head to listen to music."},
    {"name": "Smartwatch", "price": 300, "description": "A wearable device used for fitness tracking and receiving notifications."},
    {"name": "Bluetooth speaker", "price": 100, "description": "A portable speaker that connects wirelessly to devices using Bluetooth technology."}
]
cart = []

while True:
    choice = input("Do you want to continue shopping? ")

    if choice == "y":
        print("Here is a list of products and their prices:")
        for index, product in enumerate(products):
            print(f"{index}: {product['name']} : {product['description']} : ${product['price']} ")

        product_id = int(input("Enter the ID of the product you want to add to the cart:"))

        # Check if product already present in cart
        if products[product_id] in cart:
            # In this case, increase the quantity of the product rather than adding it to the cart
            products[product_id]['quantity'] += 1
        else:
            products[product_id]['quantity'] = 1
            cart.append(products[product_id])

        # Code to display the current cart contents, including the name, price, and quantity
        print("Here are the contents in your cart:")
        for product in cart:
            print(f"{product['name']} : {product['description']} : ${product['price']} : Quantity: {product['quantity']}")

    else:
        break

print(f"Thank you! Your final cart contents are: {cart}") 

Lecture: Calculating the total amount

total = 0
print("Here are the contents in your cart:")
for product in cart:
    print(f"{product['name']} : {product['description']} : ${product['price']} : Quantity: {product['quantity']}")
    total = total + (product['price'] * product['quantity'])
print(f"Cart total is: ${total}")

Entire source code:

pythonCopy code

products = [
    {"name": "Smartphone", "price": 500, "description": "A handheld device used for communication and browsing the internet."},
    {"name": "Laptop", "price": 1000, "description": "A portable computer that is easy to carry around."},
    {"name": "Headphones", "price": 50, "description": "A pair of earphones worn over the head to listen to music."},
    {"name": "Smartwatch", "price": 300, "description": "A wearable device used for fitness tracking and receiving notifications."},
    {"name": "Bluetooth speaker", "price": 100, "description": "A portable speaker that connects wirelessly to devices using Bluetooth technology."}
]
cart = []

while True:
    choice = input('Do you want to continue shopping? ')

    if choice == "y":
        print('Here is a list of products and their prices:')
        for index, product in enumerate(products):
            print(f"{index}: {product['name']} : {product['description']} : ${product['price']}")
        product_id = int(input("Enter the ID of the product you want to add to the cart:"))

        # Check if product is already present in the cart
        if products[product_id] in cart:
            # Increase the quantity of the product rather than adding it to the cart again
            products[product_id]["quantity"] += 1
        else:
            products[product_id]["quantity"] = 1
            cart.append(products[product_id])

        # Code to display the current cart contents, including the name, description, price, and quantity
        total = 0
        print('Here are the contents in your cart:')
        for product in cart:
            print(f"{product['name']} : {product['description']} : ${product['price']} : Quantity: {product['quantity']}")
            total += product['price'] * product['quantity']
        print(f"Cart total is: ${total}")
    else:
        break

print(f"Thank you, your final cart contents are: {cart}")