Hi I am facing an issue I need to add a shell task before my python tasks in a flow but its not working , throwing some error like flow outside cant be called but when i comment out all task except the shell task it works can I combine both shell task and python task in a single flow? any example??

Hi @shijas km,you have two options. First as the first task of the Flow

shell = ShellTask(...)
with Flow(...) as flow:
    s = shell()
    something_else(upstream_tasks=[s])

if you really need it before the flow begins, you need to use it in a State Handler . This is not a task though. It’s just like a Python function.

def mystatehandler(obj,old_state,new_state):
    if new_state.is_running():
        ShellTask().run(...)

with Flow(..., state_handlers=[mystatehandler]) as flow:
    ....

so what is this something__else()

@shijas km hi! here's a very basic but functional example using both

ShellTask

and normal prefect tasks

from prefect import Flow, task
from prefect.tasks.shell import ShellTask

@task(log_stdout=True)
def regular_task():
    print('hi')

my_shell_task = ShellTask(
    helper_script="cd ~",
)

with Flow("My Flow") as flow:
    # task will be executed in home directory
    contents = my_shell_task(command='ls')

    regular_task()

if __name__ == "__main__":  
    flow.run()

where do we run flow.run()

`something_else`would be another task but Nate has a full example for you

@Nate but I need the shell comand to run first , is this possible?

You can set it as the upstream task or put it in the state handler like i outlined earlier

@Kevin Kho ok to make it simple if I call shell task first and then call the other task then it will run in that order rite is that fine

Order is not guaranteed unless you set it as an explicit upstream like my first code snippet above