Python Comprehension Exercises

Let’s say you have a list of words and you want to create a new list that contains the lengths of these words.

                words = ["apple", "banana", "carrot", "durian"]
word_lengths = []

for word in words:
    word_lengths.append('')

print(word_lengths)    # [5, 6, 6, 6]

( word len )

How do you describe this for loop?

                words = ["apple", "banana", "carrot", "durian"]
word_lengths = []

for word in words:
    word_lengths.append(len(word))

print(word_lengths)    # [5, 6, 6, 6]

It calculates the length of each word in the words list and appends them to the word_lengths list This for loop iterates through the word_lengths list and appends the length

Rewrite the commented for loop by using list comprehension.

                words = ["apple", "banana", "carrot", "durian"]

'''
word_lengths = []

for word in words:
    word_lengths.append(len(word))
'''
word_lengths = ''

print(word_lengths)    # [5, 6, 6, 6]

len(word) in words [ word for ]

What will be the output of this for loop?

                values = [10, "Hello", 3.14, True, [1, 2, 3], {"name": "John"}]

for value in values:
    value_type = type(value)
    print(f"The type of {value} is {value_type}.")

This for loop iterates over values list, retrieves the value of each item and prints it This for loop iterates over values list, retrieves the type of each value and prints it

How do you describe this code?

                values = [10, "Hello", 3.14, True, [1, 2, 3], {"name": "John"}]

types = [type(value) for value in values]

print(types)

List comprehension creates a list of types for each value in the values list List comprehension creates a list of values for each value in the values list

Complete the list comprehension in a way that only returns the even numbers.

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

squared_evens = [num for num in numbers '']

print(squared_evens)  # [2, 4, 6, 8, 10]

num % 2 0 if == =

Complete this list comprehension in a way that rounds the values in the numbers list.

                numbers = [3.14, 2.7, 1.5, 4.9, 6.2]

rounded_numbers = ['' for num in numbers]

print(rounded_numbers)  # [3, 3, 2, 5, 6]

( round num )

Complete the list comprehension that converts the values inside the strings list to float numbers.

                strings = ["10", "3.14", "5", "7.5", "2.8"]

numbers = [''(string) for string in strings]

print(numbers)   # [10.0, 3.14, 5.0, 7.5, 2.8]

Use list comprehension to filter students with grade A.

                students = [
    {"name": "John", "age": 18, "grade": "A"},
    {"name": "Emily", "age": 17, "grade": "B"},
    {"name": "Michael", "age": 19, "grade": "A"},
    {"name": "Sophia", "age": 18, "grade": "B"},
]

grade_a_students = [student for student in students if '' ]

print(grade_a_students)

student “A” [“grade”] ==

Use list comprehension to filter employees from the HR department.

                employees = [
    {"name": "John", "department": "HR", "salary": 5000},
    {"name": "Emily", "department": "Finance", "salary": 6000},
    {"name": "Michael", "department": "IT", "salary": 5500},
    {"name": "Sophia", "department": "HR", "salary": 5200},
]

hr_employees = [employee for employee in employees if '']

print(hr_employees)

“HR” employee[“department”] == =

Use list comprehension to filter completed tasks (True for the “completed” key).

                tasks = [
    {"name": "Task 1", "completed": True},
    {"name": "Task 2", "completed": False},
    {"name": "Task 3", "completed": True},
    {"name": "Task 4", "completed": False},
]

completed_tasks = [task for task in tasks if ''["completed"]]

print(completed_tasks)

Python Exercises for Comprehension

If you’ve faced difficulties with these exercises, take a look at Comprehension Module on my Python course.

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Happy Coding!
Behnam Khani

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Python Comprehension Exercises

Python Exercises for Comprehension