String immutability in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a new string by replacing the first character.

Python

text = "hello"
new_text = [1] + text[1:]
print(new_text)

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

A"j"

Bj

C'j'

D"hello"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a character without quotes causes an error.

Trying to assign directly to a string index.

Strings must be enclosed in quotes. Using 'j' creates a new string starting with 'j'.

2fill in blank

medium

Complete the code to show that strings cannot be changed by assignment.

Python

text = "hello"
try:
    text[0] = [1]
except TypeError:
    print("Cannot change string characters directly")

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

A'j'

B"j"

Cj

D"hello"

Attempts:

3 left

💡 Hint

Common Mistakes

Using an unquoted character causes a NameError.

Trying to assign to string index without quotes.

Assigning a new character to a string index requires a string in quotes.

3fill in blank

hard

Fix the error in the code that tries to change a string character.

Python

word = "world"
word = [1] + word[1:]
print(word)

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

A"W"

B'W'

CW

D"world"

Attempts:

3 left

💡 Hint

Common Mistakes

Using an unquoted character causes an error.

Trying to assign directly to string index.

To create a new string with a changed first letter, use a quoted character and concatenate.

4fill in blank

hard

Fill both blanks to create a new string with the last character replaced.

Python

word = "python"
new_word = word[:[1]] + [2]
print(new_word)

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

A-1

B"!"

C5

D'!'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 6 as slice index includes the last character.

Using unquoted character causes error.

Use 5 to slice up to the last character (index 5), and '!' as the new last character.

5fill in blank

hard

Fill all three blanks to replace the middle character in a string.

Python

word = "apple"
new_word = word[:[1]] + [2] + word[[3]:]
print(new_word)

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

A2

B"i"

C3

D'i'

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong slice indexes.

Using unquoted replacement character.

Slice before index 2, add 'i' as a string, then slice from index 3 to end.