Hi everyone, I’ve been running into an

NotImplementedError

when using the prefect_shell collection. It was working previously but for some reason when I tried doing it again it’s not working. I’ve already used pip install -U prefect-shell and double checked that its installed correctly in the venv Lib But when running a simple test I get the following “Not Implemented” error: The source code can be found below:

from prefect import flow
from prefect_shell import shell_run_command

@flow
def example_shell_run_command_flow():
return shell_run_command(command="ls .", return_all=True)

if name == "main":
print("test")
example_shell_run_command_flow()

error message from the cloud UI is attached.

Error_msg▾

1569×931 120 KB▾

Any help would be appreciated. Thanks!

Hi @Charles Leung I'm not on windows, so I'm not able to reproduce exactly, but I'm wondering if this works for you instead?

from prefect_shell import ShellOperation

ShellOperation(commands=["ls ."]).run()

ShellOperation

is not a task, but can be wrapped in a

task

if desired.

shell_run_command

is still a thing for the sake of backwards compatibility, but recommend the use of

ShellOperation

Hey Nate, yeah I tried using ShellOperation when debugging, but no dice. Still returning the same error

hmm, what version of python are you on?

3.8.8

I think from this, that windows requires a different asyncio event loop policy that we don't yet seem to support, can you try placing this before your

shell_run_command

call?

asyncio.set_event_loop_policy(asyncio.WindowsProactorEventLoopPolicy())

hmm no dice unfortunately. But i found that trying it on Pycharm worked for some reason? However doing it on Visual Studio doesnt

hmm. it sounds like one way or another it must be an environment issue you’re encountering when outside of PyCharm would you be willing to open an issue on prefect-shell describing your setup and the error?