How do the implementations of asynchronous and synchronous context managers differ in Python?

A synchronous context manager implements the __enter__ and __exit__ methods, which are called when entering and exiting a with block. It is used for resource management in synchronous code.

An asynchronous context manager implements the __aenter__ and __aexit__ methods, which return awaitable objects and are used with async with in asynchronous code. This allows proper management of resources that require asynchronous release or initialization.

Example of a synchronous manager:

class SyncManager:
    def __enter__(self):
        print('Enter sync')
        return self
    def __exit__(self, exc_type, exc_val, exc_tb):
        print('Exit sync')

with SyncManager():
    print('Inside sync')

Example of an asynchronous manager:

class AsyncManager:
    async def __aenter__(self):
        print('Enter async')
        return self
    async def __aexit__(self, exc_type, exc_val, exc_tb):
        print('Exit async')

import asyncio

async def main():
    async with AsyncManager():
        print('Inside async')

asyncio.run(main())

The key difference is the methods and syntax (with vs async with), which allow proper handling of asynchronous operations within the manager.