Copy & Deepcopy

import copy
a = [1,2,3]
b = [1, 2, [3, 4]]
a_copy = a.copy()
a_deepcopy = copy.deepcopy(a)
b_copy = b.copy()
b_deepcopy = copy.deepcopy(b)
print(a == a_copy, a==a_deepcopy, a_copy==a_deepcopy)
print(a is a_copy, a is a_deepcopy, a_copy is a_deepcopy)
# Output: True True True
        # False False False
 
print("a:",a, "a_copy:",a_copy, "a_deepcopy:",a_deepcopy)
print("b:",b, "b_copy:",b_copy, "b_deepcopy:",b_deepcopy)
# Output: a: [1, 2, 3] 
        # a_copy: [1, 2, 3] 
        # a_deepcopy: [1, 2, 3]
        # b: [1, 2, [3, 4]] 
        # b_copy: [1, 2, [3, 4]] 
        # b_deepcopy: [1, 2, [3, 4]]
 
a[0] = 4
a.append(5)
b[2][0] = "c"
b.append(3)
b.append([7,8])
print("a:",a, "a_copy:",a_copy, "a_deepcopy:",a_deepcopy)
print("b:",b, "b_copy:",b_copy, "b_deepcopy:",b_deepcopy)
# Output:a: [4, 2, 3, 5] 
        # a_copy: [1, 2, 3] 
        # a_deepcopy: [1, 2, 3]
        # b: [1, 2, ['c', 4], 3, [7, 8]] 
        # b_copy: [1, 2, ['c', 4]] 
        # b_deepcopy: [1, 2, [3, 4]]

参考