33 lines
598 B
Python
33 lines
598 B
Python
|
|
|
|
def internal_ord(c):
|
|
c = c.lower()
|
|
internal_ord = ord(c) - ord("a")
|
|
if(internal_ord < 0 or internal_ord > 25):
|
|
raise ValueError("'{}' is an unsupported character".format(c))
|
|
return internal_ord
|
|
|
|
def internal_chr(i):
|
|
return chr(ord("a") + i)
|
|
|
|
|
|
def encode_or_keeps_space(c):
|
|
if(c == " "):
|
|
return (False, c)
|
|
return (True, internal_ord(c))
|
|
|
|
def prepare_string(s):
|
|
return (encode_or_keeps_space(c) for c in s)
|
|
|
|
|
|
def _caesar(s, K):
|
|
for encode, i in prepare_string(s):
|
|
if(encode):
|
|
yield internal_chr((i + K) % 26)
|
|
else:
|
|
yield i
|
|
|
|
def caesar(s, K):
|
|
return "".join(_caesar(s, K))
|
|
|