Exam PCAP-31-03 topic 1 question 82 discussion

A. ✅ Valid – "python".index("th") This returns the starting index of substring "th" in "python" → 2. → Correct B. ❌ Invalid – rfind("python","r") rfind is a string method, not a standalone function. Also, "r" isn't a valid parameter for rfind() in this context. → Error: NameError or TypeError C. ❌ Invalid – "python".sort() Strings do not have a .sort() method (only lists do). → AttributeError D. ✅ Valid – sorted("python") This returns a sorted list of the characters: ['h', 'n', 'o', 'p', 't', 'y']. → Correct

Explanation: The correct answers are: A. "python".index("th") The index() method is used to find the starting index of a substring within a string. "python".index("th") returns 2, as the substring "th" starts at index 2 in the string “python". Example:

result = “python".index("th")
print(result) # Outputs: 2 D. sorted("python") The sorted() function returns a new sorted list containing the characters of the string "python" in alphabetical order. Example:

result = sorted("python")
print(result) # Outputs: ['h', 'n', 'o', 'p', 't', 'y']