Vernam.py

text = "hello"
key = "key"

if len(key)<len(text):key=key*(len(text)//len(key)+1) #fix key length if shorter than text.

res = []
for i,j in enumerate(text):
	res.append(chr(ord(j)^ord(key[i])))

text = "".join(res)

print("encode: ", text)

res = []
for i,j in enumerate(text):
	res.append(chr(ord(j)^ord(key[i])))

print("decode: ", "".join(res))