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)

Further understanding of copy

#3. Other ways of copying

Shallow copy pair The copy of immutable types and mutable types is different

##·The sharding expression can assign a sequence

·The copy method of dictionary can copy a dictionary

·Some built-in functions can generate a copy (list)

·Copy function in the copy module

3. Property property

1. Add getter and setter methods to private properties

2. Use property to upgrade the getter and setter methods

Running results:

Running result:

3. Use property replaces getter and setter methods

@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

##Running results:

Run results:

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