Detailed explanation of context managers in python

Definition

Allows you to allocate and release resources precisely when needed

Purpose

Context manager A common use case is the locking and unlocking of resources, and closing open files

Advantages

Avoidtrivial operations: By using with, many boilerplate codes can Eliminated
avoidedforgetting steps: So we don’t have to pay attention to how the nested code exits, and we can ensure that our file will be closed

represents

the most The most common one is the with statement
Python provides the with statement syntax to construct the automatic creation and automatic release of resources

Example

Xiaobai 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')

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