Python - Having some trouble with raw_input()

Question

So I have been working on a two player "guess the number" program. But im just having trouble with one thing.

So here's code:

import time
import random
thenumber = random.randint(1, 10)
print "Welcome to Noah's Two Player guess a number game."
print "What is player one's name?"
player1 = raw_input()
print "What is player two's name?"
player2 = raw_input()
print "Well " + player1 + " and " + player2 + ", are you ready to play?"
choice = raw_input()
if choice == yes:
    print player1 + ", pick a number from 1 to 10."
    player1guess = raw_input()

    print player2 + ", pick a number from 1 to 10."
    player2guess = raw_input()

    print "Calculating..."
    time.sleep(3)

    p1 = thenumber - player1guess
    p2 = thenumber - player2guess

    if p1 > p2:
        print player1 + " won!"

    elif p2 > p1:
        print player2 + " won!"

Everything is running smoothly until I get this error:

Traceback (most recent call last):
  File "C:\Python27\Script 1", line 11, in <module>
    if choice == yes:
NameError: name 'yes' is not defined

To my knowledge, I don't think I have done anything wrong, but then again I am a beginner to python.

Someone please help me with this.

EDIT: (This is python 2.7 if it makes a difference)

Answer 1

I guess you need quotes around yes : choice =='yes' , otherwise python will think that yes is a variable.