## Blog Detail

### 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]``````
• 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]
``````
• 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]``````
• 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}.")``````
• 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)``````
• 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]
``````
• 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]``````
• 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 '' ]

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

```                ```tasks = [
] 