Explanation
Lines 4 and 5 were
number = waiting_list.index(name)
print(f"{name}'s turn is {number}")
but they should be
try:
number = waiting_list.index(name)
print(f"{name}'s turn is {number}")
except ValueError:
print(f"{name} is not in the list.")
We use a try-except block to handle the ValueError exception. If that exception occurs, we print out "name is not in the list"
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