Mis on konteksti halduri roll ja miks seda programmeerimisel kasutatakse?

The context manager is a construct in programming that manages resources, ensuring their proper opening and closing. It guarantees that necessary actions are performed before and after a block of code, such as opening and closing a file, establishing and ending a connection to a database.

In Python, the context manager is implemented via the with operator. This simplifies working with resources and prevents leaks.

Example:

with open('file.txt', 'r') as f:
    data = f.read()
# the file automatically closes after exiting the block

In QA and automation, context managers help, for example, in setting up the test environment and cleaning it after execution, which increases the reliability and readability of tests.