List concatenation and repetition in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to concatenate two lists.

Python

result = [1, 2, 3] [1] [4, 5, 6]

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

A+

B*

C/

D-

Attempts:

3 left

💡 Hint

Common Mistakes

Using '*' instead of '+' causes an error or unexpected behavior.

Using '-' or '/' are not valid for lists.

The + operator joins two lists together.

2fill in blank

medium

Complete the code to repeat the list three times.

Python

result = [0, 1] [1] 3

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

A-

B+

C/

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using '+' concatenates lists but does not repeat.

Using '-' or '/' are not valid for lists.

The * operator repeats the list multiple times.

3fill in blank

hard

Fix the error in the code to correctly concatenate two lists.

Python

result = [1, 2, 3] [1] [4]

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

A-

B*

C+

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to add a list and an integer directly causes an error.

Using '*' with a number on the right repeats the list, but here the right side is not a list.

To concatenate lists, both sides must be lists. Here, 4 is not a list, so use + with a list on the right side.

4fill in blank

hard

Fill both blanks to create a list of three repetitions of [7, 8] concatenated with [9].

Python

result = [7, 8] [1] 3 [2] [9]

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

A*

B+

C-

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using '+' before '*' changes the order of operations.

Using '-' or '/' causes errors.

First, repeat the list [7, 8] three times using *, then concatenate the result with [9] using +.

5fill in blank

hard

Fill all three blanks to create a list with the uppercase letters repeated twice and concatenated with ['Z'].

Python

letters = ['a', 'b', 'c']
result = [[1] for l in letters] [2] 2 [3] ['Z']

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

Al.upper()

B*

C+

Dl.lower()

Attempts:

3 left

💡 Hint

Common Mistakes

Using l.lower() instead of l.upper().

Using '+' instead of '*' for repetition.

Using '*' instead of '+' for concatenation.

Use l.upper() to convert letters to uppercase, repeat the list twice with *, then concatenate with + ['Z'].