Python Loops (Activity 5.10.1)

Question:   
"Simon Says" is a memory game where "Simon" outputs a sequence of 10 characters (R, G, B, Y) and the user must repeat the sequence. Create a for loop that compares the two strings. For each match, add one point to user_score. Upon a mismatch, end the game. Ex: The following patterns yield a user_score of 4:

simonPattern: R, R, G, B, R, Y, Y, B, G, Y
userPattern:  R, R, G, B, B, R, Y, B, G, Y 

Code: 

 user_score = 0
simon_pattern = 'RRGBRYYBGY'
user_pattern  = 'RRGBBRYBGY'
for i in range(len(simon_pattern)):
    x = simon_pattern[i]
    y = user_pattern[i]
    if x == y:
        user_score = user_score + 1 
    else:
        break
print ('User score:', user_score)