reverse_letters.py

def reverse_letters(input_str: str) -> str:
 """
 Reverses letters in a given string without adjusting the position of the words
 >>> reverse_letters('The cat in the hat')
 'ehT tac ni eht tah'
 >>> reverse_letters('The quick brown fox jumped over the lazy dog.')
 'ehT kciuq nworb xof depmuj revo eht yzal .god'
 >>> reverse_letters('Is this true?')
 'sI siht ?eurt'
 >>> reverse_letters("I love Python")
 'I evol nohtyP'
 """
 return " ".join([word[::-1] for word in input_str.split()])


if __name__ == "__main__":
 import doctest

 doctest.testmod()