old_contents: def atbash():
      output = ""
      for i in input("Enter the sentence to be encrypted ").strip():
          extract = ord(i)
          if 65 <= extract <= 90:
              output += chr(155 - extract)
          elif 97 <= extract <= 122:
              output += chr(219 - extract)
          else:
              output += i
      print(output)
  
  
  if __name__ == "__main__":
      atbash()
  
new_contents: """ https://en.wikipedia.org/wiki/Atbash """
  import string
  
  
  def atbash_slow(sequence: str) -> str:
      """
      >>> atbash_slow("ABCDEFG")
      'ZYXWVUT'
  
      >>> atbash_slow("aW;;123BX")
      'zD;;123YC'
      """
      output = ""
      for i in sequence:
          extract = ord(i)
          if 65 <= extract <= 90:
              output += chr(155 - extract)
          elif 97 <= extract <= 122:
              output += chr(219 - extract)
          else:
              output += i
      return output
  
  
  def atbash(sequence: str) -> str:
      """
      >>> atbash("ABCDEFG")
      'ZYXWVUT'
  
      >>> atbash("aW;;123BX")
      'zD;;123YC'
      """
      letters = string.ascii_letters
      letters_reversed = string.ascii_lowercase[::-1] + string.ascii_uppercase[::-1]
      return "".join(
          letters_reversed[letters.index(c)] if c in letters else c for c in sequence
      )
  
  
  def benchmark() -> None:
      """Let's benchmark them side-by-side..."""
      from timeit import timeit
  
      print("Running performance benchmarks...")
      print(
          "> atbash_slow()",
          timeit(
              "atbash_slow(printable)",
              setup="from string import printable ; from __main__ import atbash_slow",
          ),
          "seconds",
      )
      print(
          ">      atbash()",
          timeit(
              "atbash(printable)",
              setup="from string import printable ; from __main__ import atbash",
          ),
          "seconds",
      )
  
  
  if __name__ == "__main__":
      for sequence in ("ABCDEFGH", "123GGjj", "testStringtest", "with space"):
          print(f"{sequence} encrypted in atbash: {atbash(sequence)}")
      benchmark()
  
subject: Update atbash cipher (doc, doctest, performance) (#2017)