the function get_server, which returns one element from the list SERVERS in a round-robin fashion on each call

round-robin.py

#handy link
#http://stackoverflow.com/questions/423379/using-global-variables-in-a-function-other-than-the-one-that-created-them
#maybe a link to itertools

SERVERS = ['SERVER1', 'SERVER2', 'SERVER3', 'SERVER4']

# QUIZ - implement the function get_server, which returns one element from the
# list SERVERS in a round-robin fashion on each call. Note that you should 
# comment out all your 'print get_server()' statements before submitting 
# your code or the grading script may fail. For more info see:
# http://forums.udacity.com/cs253-april2012/questions/22327/unit6-13-quiz-problem-with-submission

n = -1
def get_server():
    global n
    n += 1
    return SERVERS[n % len(SERVERS)] 
        
    ###Your code here.

print get_server()
print get_server()
print get_server()
print get_server()
print get_server()
print get_server()
print get_server()
print get_server()

# >>> SERVER1
# >>> SERVER2
# >>> SERVER3
# >>> SERVER4
# >>> SERVER1
# >>> SERVER2
# >>> SERVER3
# >>> SERVER4