How Strings Work Differently Across Languages in DSA Python - Code Step by Step

Practice - 5 Tasks

1fill in blank

easy

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

DSA Python

first_char = my_string[[1]]

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

A1

B0

C-1

Dlength

Attempts:

3 left

💡 Hint

Common Mistakes

Using 1 as the first index

Using negative indices incorrectly

In Python, string indexing starts at 0, so the first character is at index 0.

2fill in blank

medium

Complete the code to get the substring from index 2 to 5 (exclusive).

DSA Python

substring = my_string[[1]]

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A2..5

B2,5

C2:5

D2-5

Attempts:

3 left

💡 Hint

Common Mistakes

Using commas or dashes instead of colon

Including the end index character

Python uses slice notation with a colon to get substrings: start index inclusive, end index exclusive.

3fill in blank

hard

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

DSA Python

full_string = str1 [1] str2

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A/

B*

C-

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using '*' which repeats strings

Using arithmetic operators like '-' or '/'

In Python, the '+' operator concatenates strings.

4fill in blank

hard

Complete the code to create a dictionary with words as keys and their lengths as values, only for words longer than 3 characters.

DSA Python

lengths = {word: [1] for word in words if len(word) > 3}

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Blen(word)

Cword

Dword.upper()

Attempts:

3 left

💡 Hint

Common Mistakes

Adding extra characters after word for key

Using word instead of len(word) for value

The key is the word itself (no extra syntax), and the value is the length of the word using len(word).

5fill in blank

hard

Fill all three blanks to create a dictionary with uppercase words as keys and their lengths as values, only for words shorter than 5 characters.

DSA Python

result = { [1]: [2] for word in words if len(word) [3] 5}

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Aword.upper()

Blen(word)

C<

Dword.lower()

Attempts:

3 left

💡 Hint

Common Mistakes

Using word.lower() instead of upper()

Using > instead of < in condition

Keys are uppercase words using word.upper(), values are lengths with len(word), and the condition checks words shorter than 5 using <.