Python-сообщество

 var = 'string'
i = len(var)
for i in reversed(var):
    print(i, and='')

 >>> "12345"[::-1]
'54321'

 var = 'string'
i = len(var)
for iter_ in range(1, i + 1):
    print(var[-iter_], end="")

  
>>> var = 'string'
>>> out = ''.join(reversed(var))
>>> out
'gnirts'
>>> 

  
>>> var = 'string'
>>> for i in range(len(var) - 1, -1, -1):
...     print(var[i], end='')
... else:
...     print()
... 
gnirts
>>>