Improved docstring and added comments for better readability

strings/reverse_letters.py

@@ -1,8 +1,15 @@
 def reverse_letters(sentence: str, length: int = 0) -> str:
     """
-    Reverse all words that are longer than the given length of characters in a sentence.
-    If ``length`` is not specified, it defaults to 0.
+    Reverse words in a sentence that are longer than a specified length.
 
+    Parameters:
+    sentence (str): The input sentence containing words
+    length (int): Minimum length of words to be reversed (default is 0)
+
+    Returns:
+    str: Sentence with selected words reversed
+
+    Examples:
     >>> reverse_letters("Hey wollef sroirraw", 3)
     'Hey fellow warriors'
     >>> reverse_letters("nohtyP is nohtyP", 2)
@@ -12,13 +19,25 @@ def reverse_letters(sentence: str, length: int = 0) -> str:
     >>> reverse_letters("racecar")
     'racecar'
     """
-    return " ".join(
-        word[::-1] if len(word) > length else word for word in sentence.split()
-    )
+
+    # Split the sentence into individual words
+    words = sentence.split()
+
+    # Reverse words that have length greater than the specified value
+    result = [
+        word[::-1] if len(word) > length else word  # reverse using slicing
+        for word in words
+    ]
+
+    # Join the processed words back into a sentence
+    return " ".join(result)
 
 
 if __name__ == "__main__":
     import doctest
 
+    # Run test cases defined in docstring
     doctest.testmod()
+
+    # Example execution
     print(reverse_letters("Hey wollef sroirraw"))