python_ex254.py

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class Data:
    def __init__(self):
        self.nums = [1, 2, 3, 4, 5]

    def change_data(self, index, n):
        self.nums[index] = n

data_one = Data()
data_one.nums[0] = 100
print(data_one.nums)

data_two = Data()
data_two.change_data(0, 100)
print(data_two.nums)