indexing to reverse the string in python code example

Example 1: python reverse a string

#linear

def reverse(s): 
  str = "" 
  for i in s: 
    str = i + str
  return str

#splicing
'hello world'[::-1]

Example 2: Python reverse a string

# Library
def solution(str):
    return ''.join(reversed(str)) 
  
# DIY with recursion
def solution(str): 
    if len(str) == 0: 
        return str
    else: 
        return solution(str[1:]) + str[0]