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This article mainly explains "how to manage memory in python". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Now let the editor take you to learn "how to manage memory in python"!

With regard to the memory management of python in the first place, we have to mention under what circumstances the Python interpreter will release the memory of variables. Python refers to the simple memory count to control. When the reference count of a variable is 0, it will be reclaimed by the interpreter. Of course, in interactive mode, memory will not be released immediately, and if you restart the interpreter, it will be released.

Here is the knowledge of reference counting:

1) increase the reference count when an object is created and assigned to a variable, the reference count of the object is set to 1.

When the reference count of an object increases:

Object created: X = 3.14

Another alias is created: y = x

Passed as an argument to the function (new local reference): foobar (x)

Become an element of the container object: myList = [123, x, 'xyz']

2) reduce the reference count of the reference count object:

A local reference is out of scope. For example, when the foobar () function ends

The alias of the object is explicitly destroyed: del y

An alias for an object is assigned to another object: X = 123

Object is removed from a window object: myList.remove (x)

The window object itself is destroyed: del myList

3) del statement Del statement removes a reference to the object, and its syntax is as follows: del obj [, obj2 [,... objN]]

For example, executing del y in the above example produces two results:

Remove y from the current namespace

The reference count of x minus 1

Let's try it out.

Import sys x = 3.14print ("original reference value:", sys.getrefcount (x)) y = xprint ("after being referenced by y:", sys.getrefcount (x)) x = 4.0print ("after re-assignment:", sys.getrefcount (x)) del yprint ("after deleting y reference:", sys.getrefcount (x)) original reference value: 3 after being referenced by y: 4 after re-assignment: 3 after deleting y reference: 3 I believe you have a deeper understanding of "how to manage memory in python", so you might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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