Python/ciphers/atbash.py

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""" https://en.wikipedia.org/wiki/Atbash """
import string
def atbash_slow(sequence: str) -> str:
"""
>>> atbash_slow("ABCDEFG")
'ZYXWVUT'
>>> atbash_slow("aW;;123BX")
'zD;;123YC'
"""
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output = ""
for i in sequence:
extract = ord(i)
if 65 <= extract <= 90:
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output += chr(155 - extract)
elif 97 <= extract <= 122:
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output += chr(219 - extract)
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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",
)
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if __name__ == "__main__":
for sequence in ("ABCDEFGH", "123GGjj", "testStringtest", "with space"):
print(f"{sequence} encrypted in atbash: {atbash(sequence)}")
benchmark()