A detailed description of the context manager in Python

Defined

Allows you to allocate and release resources precisely when you need them.

Use

A common use case for the context manager is to lock and unlock resources and close open files

Advantages

Avoid trivial operations : by using with, many boilerplate code can be erased
Avoid forgetting steps : So don't focus on how nested code exits, but also make sure our files are closed

Represent

The most common of these is the WITH statement.
Python provides syntax for the WITH statement to build automatic creation and automatic release of resources

Example

Small white Code:

File = open (' File_a ', ' W ') Try:    file.write (' Halo ') finally:    File.close ()

Code for nested context Manager:

With open (' File_a ', ' W ') as Write_file:    opened_file.write (' Halo ')