Hello, I am trying to run a version of the bestpractices.py example from the documents on a windows server. Can anyone tell me why the shellcommand task never returns?

Hello @mark.smith, could you please move the code to a thread so that it doesn’t crowd the main channel? I think the issue here is that you are on Windows and the ShellTask has issues as cmd does not seem to support running a script. You need to install bash and have it in the path.

Done....

#--------------------------------------------------------------

# Imports

#--------------------------------------------------------------

# basic imports

from prefect import Flow, Parameter, task

# specific task class imports

from prefect.tasks.shell import ShellTask

#--------------------------------------------------------------

# Define custom task functions

#--------------------------------------------------------------

@task

def plus_one(x):

    

"""A task that adds 1 to a number"""

    

return x + 1

@task

def build_command(name):

    

return 'echo "HELLO, {}!"'.format(name)

@task

def print_it(x):

    

print(x)

#--------------------------------------------------------------

# Instantiate task classes

#--------------------------------------------------------------

run_in_cmd = ShellTask(name='run a command', shell='cmd', return_all=True)

#--------------------------------------------------------------

# Open a Flow context and use the functional API (if possible)

#--------------------------------------------------------------

with Flow('Best Practices') as flow:

    

# store the result of each task call, even if you don't use the result again

    

two = plus_one(1)

    

# for clarity, call each task on its own line

    

name = Parameter('name')

    

cmd = build_command(name=name)

    

shell_result = run_in_cmd(command=cmd)

    

print_it(shell_result)

    

# use the imperative API where appropriate

    

#shell_result.set_upstream(two)

flow.run(parameters=dict(name='mark'))

Thank you! Appreciate it