Encrypt string in Python

import sys, hashlib, getopt

def hashCal(argv):
    string=''
    salt=''
    option=''
    try:
        opts, args = getopt.getopt(argv,"s:x:o:")
    except:
        print_usage()
        sys.exit()

    for opt, arg in opts:
        if(opt=='-h'):
            print_help()
            sys.exit()
        elif(opt=='-s'):
            string = arg
        elif(opt=='-o'):
            option = arg

    print "Entered String: %s" % (string)
    print "Your Selection: %s" % (option)

    if(option == 'md5'):
        m = hashlib.md5()
    elif(option == 'sha1'):
        m = hashlib.sha1()
    m.update(string)
    print "%s Encrypted strng: %s" %(option, str(m.digest()))


def print_usage():
    print "usage: encryption.py -s <string> -o <option>(eg: sha1,md5)"
   
def print_help():
    print "usage: encryption.py -s <string> -o <option> -o <options>: \nmd5\nsha1"

if __name__ == "__main__":
    try:
        if len(sys.argv) == 1:
            raise
        argvs = sys.argv[1:]
    except:
        print_usage()
        sys.exit()
   
    hashCal(argvs)


OUTPUT:

root@Avinash:~/python_codes/Security# python encryption.py
usage: encryption.py -s <string> -o <option>(eg: sha1,md5)root@Avinash:~/python_codes/Security# python encryption.py -s 'avinash' -o 'sha1'
Entered String: avinash
Your Selection: sha1
�U\�N)��r �Fed strng: T� �,ifroot@Avinash:~/python_codes/Security# root@Avinash:~/python_codes/Security# python encryption.py -s 'avinash' -o 'md5'
Entered String: avinash
Your Selection: md5
md5 Encrypted strng: ��u 0�)�Fk
                               h9kroot@Avinash:~/python_codes/Security#