How to assign a random value from a list to a variable in python?

please help me to assign a random value....down below almost at the end of this program.. I want to assign a random value in my hangman game.....help please i have made comment where i need help

import random
import time
wordlist = {'python', 'tomorrow', 'instagram', 'hacker', 'heaven', 'chopper', z, 'omnipresent', 'goggles', 'criminal', 'telescope', 'rainbow', 'qwerty', 'lamborghini', 'whirlpool'}

print "Start guessing..."
time.sleep(0.5)

word = (random.choice(wordlist))   #####  Don't know how to assign a random value from a list to a variable #####
guesses = ''
turns = 10

while turns > 0:         
    failed = 0

    for char in word:

        if char in guesses:
            print char,    

        else:
            print "_",     

            failed += 1    


    if failed == 0:
        print "You won"

        break              


    print 
    guess = raw_input("guess a character: ") 
    guesses += guess                    

    if guess not in word:  
        turns -= 1
        print "Wrong"    
        print "You have", + turns, 'more guesses' 

        if turns == 0:           
            print "You Loose"