How do context managers work in Python?

How do context managers work in Python?

Context managers in Python are used to manage resources, ensuring proper allocation and deallocation. They are often used with the 'with' statement.

Can you give me an example of a custom context manager?

Sure! You can create a custom context manager using a class with __enter__ and __exit__ methods. Here's a simple example:

class MyContext:
    def __enter__(self):
        print('Entering the context')
        return self

    def __exit__(self, exc_type, exc_value, traceback):
        print('Exiting the context')

with MyContext() as mc:
    print('Inside the context')

What are some common use cases for context managers?

Common use cases include file handling, database connections, and managing locks in multithreading. They help ensure resources are properly cleaned up.

How do contextlib and nested context managers work?

The contextlib module provides utilities for creating context managers. Nested context managers allow you to manage multiple resources simultaneously using a single 'with' statement.