Why Hash Map Exists and What Problem It Solves in DSA Python - Test Your Knowledge

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a dictionary that stores a person's age.

DSA Python

person_age = {'Alice': [1]

Drag options to blanks, or click blank then click option'

Aage

B'25'

C25

DNone

Attempts:

3 left

💡 Hint

Common Mistakes

Using quotes around the number, making it a string instead of a number.

The value for 'Alice' should be the number 25, not a string or variable name.

2fill in blank

medium

Complete the code to check if 'Bob' is in the dictionary keys.

DSA Python

if [1] in person_age:

Drag options to blanks, or click blank then click option'

ABob

B'Bob'

Cperson_age

D'Alice'

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting quotes around 'Bob', causing a NameError.

Dictionary keys are strings here, so 'Bob' must be in quotes.

3fill in blank

hard

Fix the error in the code to add a new key-value pair to the dictionary.

DSA Python

person_age[[1]] = 30

Drag options to blanks, or click blank then click option'

A'Charlie'

B30

Cage

Dperson_age

Attempts:

3 left

💡 Hint

Common Mistakes

Using a number or variable name instead of a string key.

The key must be a string 'Charlie' to add a new person.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps names to ages for people older than 20.

DSA Python

{ [1]: [2][[1]] for [1] in [2] if [2][[1]] > 20 }

Drag options to blanks, or click blank then click option'

Aname

Bage

Cpeople

Dperson

Attempts:

3 left

💡 Hint

Common Mistakes

Using the dictionary name as key or wrong variable names.

Use 'name' as the key and 'people' to get the age value in the comprehension.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that stores uppercase names as keys and ages as values for people aged 18 or older.

DSA Python

{ [1]: [2] for [3] in people if people[[3]] >= 18 }

Drag options to blanks, or click blank then click option'

Aname.upper()

Bpeople[name]

Cname

Dage

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong variable names or forgetting to uppercase keys.

Use 'name.upper()' for keys, 'people[name]' for values, and 'name' as the loop variable.