sniffio 1.0.0

sniffio: Sniff out which async library your code is running under

You’re writing a library. You’ve decided to be ambitious, and support multiple async I/O packages, like Trio, and asyncio, and … You’ve written a bunch of clever code to handle all the differences. But… how do you know which piece of clever code to run?

This is a tiny package whose only purpose is to let you detect which async library your code is running under.

• Documentation: https://sniffio.readthedocs.io

• Bug tracker and source code: https://github.com/python-trio/sniffio

• License: MIT or Apache License 2.0, your choice

• Contributor guide: https://trio.readthedocs.io/en/latest/contributing.html

• Code of conduct: Contributors are requested to follow our code of conduct in all project spaces.

This library is maintained by the Trio project, as a service to the async Python community as a whole.

from sniffio import current_async_library
import trio
import asyncio

async def print_library():
    library = current_async_library()
    print("This is:", library)

# Prints "This is trio"
trio.run(print_library)

# Prints "This is asyncio"
asyncio.run(print_library())