Why data structures matter for efficiency in Intro to Computing - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a list of numbers from 0 to 5.

Intro to Computing

numbers = list(range([1]))

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

A1

B5

C6

D0

Attempts:

3 left

💡 Hint

Common Mistakes

Using 5 as the stop value will exclude 5 from the list.

Using 0 as the stop value will create an empty list.

The range(6) function generates numbers from 0 up to 5, so the list will contain numbers 0 to 5. Since we want numbers 1 to 5, we will adjust in later tasks.

2fill in blank

medium

Complete the code to create a dictionary that maps numbers to their squares for numbers 1 to 5.

Intro to Computing

squares = {x: x[1]2 for x in range(1, [2])}

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A**

B*

C6

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using * instead of ** will multiply but not square.

Using range(1, 5) will exclude 5.

The ** operator is used for exponentiation in Python. The range(1, 6) generates numbers from 1 to 5.

3fill in blank

hard

Fix the error in the code to check if a value exists in a list.

Intro to Computing

if [1] in my_list:
    print("Found it!")

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Avalue

Bindex

Cin

Dmy_list

Attempts:

3 left

💡 Hint

Common Mistakes

Using the list name instead of the value to check.

Using keywords like 'in' or 'index' incorrectly.

To check if a value is in a list, you use the syntax value in list. Here, value is the item you want to find.

4fill in blank

hard

Fill both blanks to create a set of unique numbers from a list.

Intro to Computing

unique_numbers = set([1])
print(len([2]))

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Anumbers

Bunique_numbers

Clist

Dset

Attempts:

3 left

💡 Hint

Common Mistakes

Using list or set as variable names incorrectly.

Mixing up the variable names in the print statement.

The set() function creates a set of unique elements from the list numbers. Then, len(unique_numbers) gives the count of unique numbers.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension filtering even numbers and mapping to their squares.

Intro to Computing

even_squares = { [1]: [2] for [3] in range(1, 11) if [3] % 2 == 0 }

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

Ax

Bx**2

Dn

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names inconsistently.

Not squaring the number for the value.

The dictionary comprehension uses x as the key and x**2 as the value for even numbers x from 1 to 10.