Zero Width Decoder

from sys import argv
if len(argv) <= 1:
    exit("Synthax:\npython3 script.py encodedInvisibleString\nYou can happen other chars as well, they'll just be ignored")

def textFromBits(bits, encoding='utf-8', errors='surrogatepass'):
    n = int(bits, 2)
    return n.to_bytes((n.bit_length() + 7) // 8, 'big').decode(encoding, errors) or '\0'
# Used to separate bits
#zws = "\u200b" # Zero width space
# Represents a one
zwj = "\u200d" # Zero width joiner
#zwj = "a" # Zero width joiner
# Represents a zero
zwnj = "\u200c" # Zero width non-joiner
#zwnj = "b" # Zero width non-joiner

message = ""
for arg in argv[1:]:
    message += arg + " "
message = message[:-1]
msg = ""
for c in message:
    if c in zwj or c in zwnj:
        msg += c
message = msg
print("Zero width message (len {}): \"{}\"".format(len(message), message))
msgBin = "".join(["1" if c in zwj else "0" for c in message])
#print("Binary message: " + msgBin)
origMsg = textFromBits(msgBin)
print("Original message: " + origMsg)