Chapter Practice Arena

Comprehensions and Functional Patterns Problems

Targeted practice challenges specifically curated for this chapter. Inspect hints, verify outputs, and check Pythonic solutions.

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Showing 6 challenges · 25 total · Page 1 of 5

#1intermediateDictionary and Set Comprehensions

Given words = ['cat', 'dog', 'elephant'], create a dictionary using each word's length as the key and the word itself as the value. Print the result. Explain why the key 3 maps to only one word.

Starter Code

words = ['cat', 'dog', 'elephant']
# Build and print the dictionary

Expected Output:{3: 'dog', 8: 'elephant'}

#2intermediateIterators and Generators

Write a generator positive_numbers(numbers) that yields only numbers greater than zero. Use it with sum() to calculate the total of [-3, 4, 0, 7, -1].

Starter Code

def positive_numbers(numbers):
    # Yield only positive values
    pass

values = [-3, 4, 0, 7, -1]
print(sum(positive_numbers(values)))

Expected Output:11

#3beginnerComprehensions with Conditions

Given numbers = [-3, 1, 2, 4, -5], create a list containing the squares of only the positive numbers. Print the result.

Starter Code

numbers = [-3, 1, 2, 4, -5]
# Keep positive numbers and square them

Expected Output:[1, 4, 16]

#4beginnerList Comprehensions

Use a list comprehension to create a list containing double each integer from 1 through 3. Print the resulting list.

Starter Code

# Create the list using a comprehension

Expected Output:[2, 4, 6]

#5intermediateDictionary and Set Comprehensions

Given scores = {'Asha': 75, 'Ravi': 42, 'Mina': 90, 'Kabir': 49}, create a dictionary containing only students whose scores are at least 50. Preserve each student's name and score.

Starter Code

scores = {'Asha': 75, 'Ravi': 42, 'Mina': 90, 'Kabir': 49}
# Create and print the passing scores

Expected Output:{'Asha': 75, 'Mina': 90}

#6intermediateLambda, map, and filter

Given numbers = [1, 2, 3, 4, 5, 6], select the even numbers and then double the selected values. Use filter() and map(), and print the final list.

Starter Code

numbers = [1, 2, 3, 4, 5, 6]
# Filter even numbers, then double them

Expected Output:[4, 8, 12]

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