Because a string is a sequence, a for loop can walk through it one character at a time. for ch in 'cat': runs its body three times with ch equal to 'c', 'a' and 't' in turn. This is the natural way to count, test or transform characters, and it avoids manual indexing errors.
Free account
Keep reading for free
Create a free StudyToCert account to read the rest of this lesson: 6 more sections, 3 key terms, a real-world example, an exam tip and self-check questions. Every lesson, lab and practice test is free with an account.