最基础的加密方法，将一个字符串中的所有字符按照其在字母表中的顺序向前或后移动shift位，得到密码
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def shift_char(c, shift):
if c.islower():
return chr(((ord(c)-97+shift)%26)+97)
elif c.isupper():
return chr(((ord(c)-65+shift)%26)+65)
else:
return c # don not shift non-letters
def caesar_cipher(s, shift):
m = ""
for c in s:
m += shift_char(c, shift)
return m
text = "Thank You!" # the die has been cast
print text, "becomes", caesar_cipher(text, 6)
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