Useful Python Codes

####### Search and Match Files in a directory #######
    os.chdir(path)
    """ take list of all files present
        in the directory as a list"""
    fnames = [
        fname for fname in os.listdir(path)
        if os.path.isfile(os.path.join(path, fname))
    ]
    print(fnames)
    
##########################################################
Run Shell Script via Python 

        out = subprocess.call(
            ['xyz.sh', str(var1), str(var2), str(var3), str(u), str(p)], shell=True)
        print "printing out of shell script on console"
######################################################################
Decrytion 

def decrypt(ciphertext, key):
    """Decrypts a given ciphertext with the given key, using AES-CFB.
       message - The ciphertext to decrypt (byte string).
       key - The AES key (16 bytes).
       returns The cleartext (byte string)
    """
    dec = []
    enc = base64.urlsafe_b64decode(ciphertext)
    for i in range(len(enc)):
        key_c = key[i % len(key)]
        dec_c = chr((256 + ord(enc[i]) - ord(key_c)) % 256)
        dec.append(dec_c)
    return "".join(dec)


def read_details(f, s, ep):
    bkey32 = s.ljust(32)[:32]
    with open(f, 'r') as input_file:
        for line in input_file:
            if ep in line.rstrip():
                y = ast.literal_eval(line)
                z = decrypt(y['password'], bkey32)
                a = y['username']
                return a, z
  ######################## Encryption ########################
  def encrypt(message, d):
    """Encrypts a given message with the given key, using AES-CFB.
       message - The message to encrypt (byte string).
       key - The AES key (16 bytes).

       returns (ciphertext). Both values are byte strings.
    """
    encoded_chars = []
    for i in xrange(len(message)):
        key_c = d[i % len(d)]
        encoded_c = chr(ord(message[i]) + ord(key_c) % 256)
        encoded_chars.append(encoded_c)
    encoded_string = "".join(encoded_chars)
    print encoded_string
    print base64.urlsafe_b64encode(encoded_string)
    return base64.urlsafe_b64encode(encoded_string)