How to create nested lists with random numbers? [duplicate]

Please if you know how to solve this: I need to add nested lists, each list with randomly generated numbers, but within the same range. If I run my code like it is, it adds nested lists, each list with the correct length of 6 numbers, but the problem is that all numbers in the lists are identical! the output is like that:

[
    [27, 2, 23, 12, 9, 2, 28, 31],
    [27, 2, 23, 12, 9, 2, 28, 31],
    [27, 2, 23, 12, 9, 2, 28, 31],
    [27, 2, 23, 12, 9, 2, 28, 31]
]

How can I manage to generate new numbers each time I call the function in the for loop?

lottery_numbers = []
numbers_list = []

def num_generator():
   for num in range(0, 2):
      random_number = random.randint(1, 40)
      numbers_list.append(random_number)
      lottery_numbers.append(numbers_list)
  

for number in range(0, 4):
  num_generator()