names = ['A', 'B', 'C']
score = {}
values = [0,0,0]

#Creat a dictory:{'A': [0, 0, 0], 'B': [0, 0, 0], 'C': [0, 0, 0]}
for name in names:
    score.setdefault(name, values)
print(score)

#Change the value of key B
for name in names:
    score['B'][0] = 1
print(score)

# The result is:{'A': [1, 0, 0], 'B': [1, 0, 0], 'C': [1, 0, 0]}