python advanced programming
1.==, the use of is


Summary
·is is to compare whether two references Point to the same object (reference comparison).
·== is to compare whether two objects are equal.
2. Deep copy, shallow copy
1.Shallow copy
Shallow copy is a top-level copy of an object
The popular understanding is: copy There is a reference, and the content is not copied


2. Deep copy
Deep copy is for all levels of an object Copy (recursion)













1. Add getter and setter methods to private properties






@property becomes a property function, which can make necessary checks when assigning properties and ensure that the code is clear and short. It has two main functions
·Convert methods Read-only
·Re-implement the setting and reading methods of an attribute, which can be used for boundary determination




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