VK MP3 Mod messages de- and encryption

DieMP3.py

#!/usr/bin/python3
# VK MP3 Mod messages de- and encryption

import argparse

chars = " ​‌‏ "
prefix = "  "
sep = " "

def decrypt(s):
	if (not s.startswith(prefix)): return s
	return bytearray(sum(chars.index(i[len(i)-j-1])*len(chars)**j for j in range(len(i))) for i in s.replace(prefix, '').split(sep)).decode('utf-8')
def encrypt(s):
	text = list()
	for i in s.encode('utf-8'):
		c = str()
		while (i):
			c = chars[i % len(chars)]+c
			i //= len(chars)
		text.append(c)
	return prefix+sep.join(text)

def main(d):
	print((decrypt if (d) else encrypt)(input()))

if (__name__ == '__main__'):
	argparser = argparse.ArgumentParser()
	argparser.add_argument('-d', help='Decode', action='store_true')
	cargs = argparser.parse_args()
	main(cargs.d)

# by Sdore, 2018