Uvloop: AttributeError: module 'asyncio.coroutines' has no attribute 'debug_wrapper'

[wallies]

• uvloop version: v0.9.1
• Python version: 3.7b1
• Platform: Alpine 3.7
• Can you reproduce the bug with PYTHONASYNCIODEBUG in env?: Not relevant

AttributeError: module 'asyncio.coroutines' has no attribute 'debug_wrapper'

asyncio no longer uses sys.set_coroutine_wrapper. So asynicio.coroutines no longer has a debug_wrapper
https://github.com/python/cpython/pull/5250

[wumpus]

I am seeing this on python 3.7.0b4 with uvloop 0.9.1

I installed from git -- it says it is uvloop-0.9.2.dev0 -- and I see the same error.

3.7 is getting close to release! People cannot easily test if fundamental libs like uvloop and pyyaml are not updated.

Looks like PR https://github.com/MagicStack/uvloop/pull/138 is intended to fix this bug -- I installed the branch from the PR and this test passes for me.

[1st1]

I'll work on this next week. Expect to see an update soon.

[ghost]

Can confirm this also.

If it is any use, this is the traceback I get for this.

Traceback (most recent call last):
  File "/usr/local/lib/python3.7/runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "/usr/local/lib/python3.7/runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "/home/ashley/code/n3/n3/__main__.py", line 57, in <module>
    main()
  File "/home/ashley/code/n3/n3/__main__.py", line 47, in main
    import uvloop
  File "/home/ashley/code/n3/venv/lib/python3.7/site-packages/uvloop/__init__.py", line 7, in <module>
    from .loop import Loop as __BaseLoop  # NOQA
  File "uvloop/includes/stdlib.pxi", line 41, in init uvloop.loop
AttributeError: module 'asyncio.coroutines' has no attribute 'debug_wrapper'

Platform: Python3.7b4, Ubuntu 16.04.3 LTS x64

[1st1]

Fixed in #149. You can now build uvloop from source and test under Python 3.7.

[willingc]

@1st1 Is there a similar error with Python 3.8?

I've tried installing datasette, uvicorn, and uvloop all from master HEAD. Get the following error:

  File "/Users/willingc/projects/datasette-bpo/uvicorn/uvicorn/loops/auto.py", line 6, in auto_loop_setup
    import uvloop
  File "/Users/willingc/projects/datasette-bpo/testenv/lib/python3.8/site-packages/uvloop/__init__.py", line 7, in <module>
    from .loop import Loop as __BaseLoop  # NOQA
  File "uvloop/includes/stdlib.pxi", line 41, in init uvloop.loop
AttributeError: module 'asyncio.coroutines' has no attribute 'debug_wrapper'

[1st1]

I've tried installing datasette, uvicorn, and uvloop all from master HEAD. Get the following error:

That's weird, as that line of code was fixed a year ago:

https://github.com/MagicStack/uvloop/blob/695a520195c7cecc20754cf41e98b4242dc26fcc/uvloop/includes/stdlib.pxi#L46

I suspect you're using an old version of uvloop. Try installing with pip install uvloop==0.14.0rc1.

[willingc]

Thanks @1st1 that resolved the issue. :smile:

[1st1]

@willingc Note that 0.14.0rc1 had a nasty bug with libuv ignoring SIGINT. Install 0.14.0rc2 with pip install uvloop==0.14.0rc2