Python depth copy, python depth

Python depth copy, python depth

1. python deep copy principle:
For numbers and strings, assigning values, copying values, and copying values are meaningless because they always point to the same memory address. For dictionaries, tuples, and lists, assigning values, the memory address varies with the shortest copy and deep copy operations;
Shallow copy:

1> for numbers and strings:

2> for dictionaries, tuples, and lists:

Deep copy:

1> for numbers and strings:

2> for dictionaries, tuples, and lists:

2. Deep copy application: copy the original standard. The original standard after replication cannot be changed;