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empty_lists = [ [] for _ in range(n) ]
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if __name__ == '__main__':
n = 10
a = [[] for x in range(n)]
print(a) # [[], [], [], [], [], [], [], [], [], []]
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# There are two common methods to create an empty list
x = list()
print(len(x)) # Output: 0
y = []
print(len(x)) # Output: 0