Deep, shallow copy

1, first for numbers and strings, the depth of the copy is meaningless, both point to the same memory address.

1 a = 1232print(ID (a))34 b = a5Print  (ID (b))678 4958497449 495849744

2, for dictionaries, Ganso, lists, the assignment, shallow copy and deep copy, its memory address changes are different.

Shallow copy, memory address unchanged, two times assignment all point to the same memory address.

Import= {"K1""v1" "K2  "K3": ["v2", 222]}Print = Copy.copy  (a)print(ID (b)) 1027860010278600 

Deep copy, all data is recreated in memory (excluding the last layer), which in fact excludes the last layer of strings and numbers.

1 ImportCopy2 3A = {"K1":"v1","K2": 111,"K3": ["v2", 222]}4 Print(ID (a))5 6b =Copy.deepcopy (a)7 Print(ID (b))8 9 Ten10147528 One10598792

Deep, shallow copy