if __name__ == '__main__':
n = 10
a = [[] for x in range(n)]
print(a) # [[], [], [], [], [], [], [], [], [], []]
>>> l = [None] * 10
>>> l
[None, None, None, None, None, None, None, None, None, None]
empty_lists = [ [] for _ in range(n) ]
list = list()
list = []
n = 5
lst = [None] * n
print(lst)
# [None, None, None, None, None]
lst = [None] * 10
>>> num = []
>>> len(num)
0