Add dictionary in List in Python but, data is duplicated

data = []
dic = dict.fromkeys(['a', 'b', 'c'], 0)

value = 1
for i in range(3):
    key = list(dic.keys())
    for j in range(len(dic)):
        dic[key[j]] = value
        value += 1
    data.append(dic)
    
for i in data:
    print(i)

In this code, I expexted like this.

{1, 2, 3}
{4, 5, 6}
{7, 8, 9}

but the result is

{7, 8, 9}
{7, 8, 9}
{7, 8, 9}

How can i fix this code to get result that i expected?

>Solution :

Instead of :

    data.append(dic)

Use:

    data.append(dic.copy())

This will create a new object, instead of adding a reference to dic to your list.