How to use the _ _ del__ method in python

This article mainly explains "how to use the _ _ del__ method in python". The content in the article is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to use the _ _ del__ method in python".

1. The _ _ del__ method is called a destructor and is used to implement the operations required for the object to be destroyed. Ex: release resources occupied by objects, open file resources, network connections, and so on.

Python implements automatic garbage collection, and the garbage collector calls the _ _ del__ method when the object is not referenced (reference count is 0).

2. Delete the object with the del statement to ensure that the _ _ del__ method provided automatically by the system is called. Generally, there is no need for a custom destructor.

Example

Class Person: def _ del__ (self): print ("destroy object: {0}" .format (self)) p1 = Person () # 5. Destroy object: print (id (p1)) # 1. 2060731260872p2 = Person () # 3. Destroy object: print (id (p2)) # 2. 2060731302024del p2print ("over") # 4. Over# print (id (p2)) # name 'p2' is not defined thank you for reading. This is the content of "how to use the _ _ del__ method in python". After the study of this article, I believe you have a deeper understanding of how to use the _ _ del__ method in python. The specific use situation still needs to be verified by practice. Here is, the editor will push for you more related knowledge points of the article, welcome to follow!