hex to string in python - also basic usage of getopt

pyconv.py

#!/usr/bin/env python
import getopt
import sys
import binascii

def usage():
    print("""%s [-oxd]

-x hex
-d decode
-b base64

""" % sys.argv[0])

try:
    opts, args = getopt.getopt(sys.argv[1:], "dho:xb", ["help", "output="])
except getopt.GetoptError as err:
        # print help information and exit:
        print(err)  # will print something like "option -a not recognized"
        usage()
        sys.exit(2)

decode = False
encoding = 0

for opt, arg in opts:

    if opt == "-d":
        decode = True

    if opt == '-x':
        encoding = "hex"

    elif opt == "-h":
        usage()
        exit(0)

#print(decode, encoding)

string = raw_input()
while 1:

    if decode:
        try:
            print string.decode("hex")
            string = raw_input()
        except ValueError:
            exit("invalid hex")
        except EOFError:
            exit(0)
else:
    print(string.encode('utf-8').hex())