シーザー暗号
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import string
def cipher(a_string, key: int):
uppercase = string.ascii_uppercase
lowercase = string.ascii_lowercase
encrypt = ""
for c in a_string:
if c in uppercase: # iが大文字ならば
new = (uppercase.index(c) + key) % 26
encrypt += uppercase[new]
if c in lowercase:
new = (lowercase.index(c) + key) % 26
encrypt += lowercase[new]
if (c not in uppercase) and (c not in lowercase):
encrypt += c
return encrypt
a_str = "my name is Gaius Iulius Caesar."
print(cipher(a_str, 3))
Python
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