copy Under the same object, one can change one copy without changing the other. Therefore, if one of them changed, the other one will be changed affected by changed one. a = [1, 2, 3, 4] b = a # shallow copy print(b) # [1, 2, 3, 4] b[2] = 100 print(b) # [1, 2, 100, 4] print(a) # [1, 2, 100, 4] copy.copy Shallow copy, once copy from one to another one, its reference is same object. Copy only the ..