Let's make a deep copy
a_list contents: [10, 'banana', [997, 123]]
b_list contents: [10, 'banana', [997, 123]]
Is it the same object? False

Let's modify b_list[2]
a_list contents: [10, 'banana', [997, 123]]
b_list contents: [10, 'banana', [112, 123]]
Is it the same object? False