How do you reverse a string in Python using slicing and using a for loop?

Using slicing: s[::-1] returns a new string that is the reverse of s. It works by stepping through the string backwards. Using a for loop: iterate over each character in s and prepend it to a new string: reversed_str = '' ; for char in s: reversed_str = char + reversed_str. Both methods produce the same result. The slicing method is more concise and typically faster, while the loop method demonstrates manual string construction. Both run in O(n) time and O(n) space.