I have entered a source that implements caesar crypto tools.
Then, why comes syntex error?
Which part is wrong?
And, for example, if I want to encrypt 'AWESOME STUDENTS'
how do you modify it?
I'm a first-timer of Python. I ask for your warm attention!
import sys
ENC = 0
DEX = 1
def makeDisk(key):
keytable = map(lambda x: (chr(x+65),x), range26))
key2index = {}
for t in keytable:
alphabet, index = t[0], t[1]
key2index[alphabet] = index
if key in key2index:
k = key2index[key]
else:
return None, None
enc_disk = {}
dex_disk = {}
for i in range(26):
enc_i = (i+k)%26
enc_ascii = enc_i+65
encc_disk[chr(i+65)] = chr(enc_ascii)
dec_disk[chr(enc_ascii)] = chr(i+65)
return enc_disk, dec_disk
def caesar(msg, key, mode):
ret = ' '
msg = msg.upper()
enc_disk, dex_disk = makeDisk(key)
if enc_disk is None:
return ret
if mode is ENC:
disk = enc_disk
if mode is DEC:
disk = dec_disk
for c in msg:
if c in disk:
ret += disk[c]
else:
ret += c
return ret
def main():
plaintext = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
key = 'F'
print('Original:\t%s' %plaintext.upper())
ciphertext = caesar(plaintext, key, ENC)
print('Caesar Cipher:\t%s' %ciphertext)
deciphertext = caesar(ciphertext, key, DEC)
print('Deciphered:\t%s' %deciphertext)
if __name __=='__main__':
main()