Reversed Text

Source: May 2024, Task 3 (DTU 02002/02003). Study solution — not an official answer key.

Problem

Given a string of words separated by single spaces, and an option 'words' or 'letters':

• 'words' — reverse the order of the words
• 'letters' — reverse the letters inside each word (keep word order)

Write reversed_text(text, option) returning the transformed string.

>>> reversed_text('Hello world we are going to do some programming', 'letters')
'olleH dlrow ew era gniog ot od emos gnimmargorp'

Approach

Split on spaces. For words, reverse the list; for letters, reverse each word with slicing [::-1], then join with spaces.

Solution

def reversed_text(text, option):
    words = text.split(" ")
    if option == "words":
        return " ".join(reversed(words))
    if option == "letters":
        return " ".join(word[::-1] for word in words)
    raise ValueError("option must be 'words' or 'letters'")