シーザー復号
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import string
def decryption(encryption, key: int):
uppercase = string.ascii_uppercase
lowercase = string.ascii_lowercase
decrypt = ""
for c in encryption:
if c in uppercase:
index = (uppercase.index(c) - key) % 26
decrypt += uppercase[index]
if c in lowercase:
index = (lowercase.index(c) - key) % 26
decrypt += lowercase[index]
if (c not in uppercase) and (c not in lowercase):
decrypt += c
return decrypt
a_str = "pb qdph lv Jdlxv Lxolxv Fdhvdu."
print(decryption(a_str, 3))
Python
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