What are the differences between synchronous and asynchronous context managers?

What are the differences between synchronous and asynchronous context managers?

Synchronous context managers are used with the 'with' statement to manage resources in a blocking manner, while asynchronous context managers allow for non-blocking resource management using 'async with'.

Can you give me an example of each?

Sure! A synchronous context manager example is opening a file:

with open('file.txt') as f:
    data = f.read()

An asynchronous context manager example is using an async database connection:

async with async_db.connect() as conn:
    await conn.execute('SELECT * FROM table')

When should I use async context managers?

Use async context managers when dealing with I/O-bound operations, like network requests or database queries, to avoid blocking the event loop.

Are there any performance differences?

Yes, async context managers can improve performance in I/O-bound applications by allowing other tasks to run while waiting for I/O operations to complete.