String indexing (positive and negative) in Python - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to get the first character of the string.

Python

word = "hello"
first_char = word[[1]]
print(first_char)

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

A1

B0

C-1

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using 1 instead of 0 for the first character.

Using -1 which gives the last character.

The first character of a string is at index 0.

2fill in blank

medium

Complete the code to get the last character of the string using negative indexing.

Python

word = "world"
last_char = word[[1]]
print(last_char)

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

A-1

B0

C1

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using 5 which is out of range.

Using 1 which gives the second character.

Negative index -1 gives the last character of the string.

3fill in blank

hard

Fix the error in the code to get the second last character using negative indexing.

Python

word = "python"
second_last = word[[1]]
print(second_last)

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

A5

B2

C-1

D-2

Attempts:

3 left

💡 Hint

Common Mistakes

Using 2 which gives the third character.

Using -1 which gives the last character.

Index -2 gives the second last character in the string.

4fill in blank

hard

Fill both blanks to get the middle character of the string 'abcde'.

Python

word = "abcde"
middle_char = word[[1] + [2]]
print(middle_char)

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

A2

B1

C0

D-1

Attempts:

3 left

💡 Hint

Common Mistakes

Using 0 + 2 which also equals 2 but not the intended answer.

Using negative indexes here causes confusion.

The middle character is at index 2. Using 1 + 1 equals 2.

5fill in blank

hard

Fill all three blanks to create a dictionary with keys as characters and values as the negation of their position indexes in the string.

Python

word = "code"
index_map = { [1]: [2] for [3] in range(len(word)) }
print(index_map)

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

Aword[i]

B-i

Ci

Dword

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'word' instead of 'word[i]' for keys.

Using 'i' instead of '-i' for values.

This creates a dictionary where each character maps to the negation of its position index.