Quiz 2 Prep - Python Applications

The challenges here are optional and are not graded.
Use these challenges to prepare yourself for the upcoming quiz.
You will have 25 minutes to complete two questions that are similar to the ones shown here.

▶️ First, run the code cell below to import unittest, a module used for 🧭 Check Your Work sections and the autograder.

# DO NOT MODIFY THE CODE IN THIS CELL
import unittest

tc = unittest.TestCase()

🎯 Challenge 1: Average Number of Reviews using a For Loop¶

You are given a list-type variable named products, which contains a list of dictionaries. Each dictionary in the list contains the brand, number of reviews, and name of a beauty product on Sephora.com. 💄

👇 Tasks¶

Use a for loop to find the average number of reviews of Laneige products (products where "brand" is "Laneige").
Store the result to a new variable named avg_num_reviews.

📤 Expected Output¶

Laneige products have 6084.0 reviews on average.

my_products = [
    {"brand": "Laneige", "num_reviews": 12715, "name": "Lip Sleeping Mask"},
    {"brand": "The Ordinary", "num_reviews": 2274, "name": "Hyaluronic Acid 2% + B5"},
    {"brand": "Laneige", "num_reviews": 2771, "name": "Water Sleeping Mask"},
    {"brand": "The Ordinary", "num_reviews": 3952, "name": "Niacinamide 10% + Zinc 1%"},
    {
        "brand": "Chanel",
        "num_reviews": 528,
        "name": "CHANCE EAU TENDRE Eau de Toilette",
    },
    {"brand": "Laneige", "num_reviews": 2766, "name": "Lip Glowy Balm"},
    {"brand": "Chanel", "num_reviews": 724, "name": "COCO MADEMOISELLE Eau de Parfum"},
]

# YOUR CODE BEGINS

# YOUR CODE ENDS

print(f"Laneige products have {avg_num_reviews} reviews on average.")

🧭 Check Your Work¶

Run the code cell below to test your solution.

✔️ If the code cell runs without errors, you’re good to move on.
❌ If the code cell produces an error, review your code and fix any mistakes.

_test_case = "average-number-of-reviews-using-a-for-loop"
_points = 10
_obfuscate = False

tc.assertAlmostEqual(avg_num_reviews, 6084)

🎯 Challenge 2: Average Number of Reviews using a Function¶

Let’s make your logic from the previous question reusable by creating a function.

👇 Task¶

Create a function named get_avg_num_reviews() that returns the average number of reviews of products for a given brand.

The get_avg_num_reviews function takes the following two parameters:

products - This is a list of dictionaries. Each dictionary in the list contains the brand, number of reviews, and name of a beauty product.
brand - This is a string value containing the brand name (e.g., 'Laneige').

If there is no matching brand in the products list, return -1.

💡 Example¶

get_avg_num_reviews(my_products, "Laneige") should return the average number of reviews of Laneige products in my_products list.

📤 Expected Output¶

my_products = [
    {"brand": "Laneige", "num_reviews": 12715, "name": "Lip Sleeping Mask"},
    {"brand": "The Ordinary", "num_reviews": 2274, "name": "Hyaluronic Acid 2% + B5"},
    {"brand": "Laneige", "num_reviews": 2771, "name": "Water Sleeping Mask"},
    {"brand": "The Ordinary", "num_reviews": 3952, "name": "Niacinamide 10% + Zinc 1%"},
    {
        "brand": "Chanel",
        "num_reviews": 528,
        "name": "CHANCE EAU TENDRE Eau de Toilette",
    },
    {"brand": "Laneige", "num_reviews": 2766, "name": "Lip Glowy Balm"},
    {"brand": "Chanel", "num_reviews": 724, "name": "COCO MADEMOISELLE Eau de Parfum"},
]
your_products = [
    {"brand": "NARS", "num_reviews": 11923, "name": "Radiant Creamy Concealer"}
]


# YOUR CODE BEGINS

# YOUR CODE ENDS

print(get_avg_num_reviews(my_products, "Laneige"))
print(get_avg_num_reviews(my_products, "The Ordinary"))
print(
    get_avg_num_reviews(my_products, "Sulwhasoo")
)  # edge case - no matching brand, should return -1
print(get_avg_num_reviews(my_products, "Chanel"))
print(get_avg_num_reviews(your_products, "NARS"))
print(
    get_avg_num_reviews([], "First Aid Beauty")
)  # edge case - empty, should return -1

🧭 Check Your Work¶

Run the code cell below to test your solution.

✔️ If the code cell runs without errors, you’re good to move on.
❌ If the code cell produces an error, review your code and fix any mistakes.

_test_case = "average-price-of-sneakers-using-a-function"
_points = 15
_obfuscate = False

tc.assertAlmostEqual(get_avg_num_reviews(my_products, "Laneige"), 6084.0)
tc.assertAlmostEqual(get_avg_num_reviews(my_products, "The Ordinary"), 3113.0)
tc.assertAlmostEqual(get_avg_num_reviews(my_products, "Chanel"), 626.0)
tc.assertAlmostEqual(get_avg_num_reviews(my_products, "JLo Beauty"), -1)
tc.assertAlmostEqual(get_avg_num_reviews(your_products, "NARS"), 11923.0)
tc.assertAlmostEqual(get_avg_num_reviews([], "First Aid Beauty"), -1)

Assignments

Exercise 5 - Pandas Filtering and Sorting

Assignments

Problem Set - Python Applications