@Scout how to make an output of an @op optional?

To make an output of an

@op

optional in Dagster, you can use the

Out

class and set the

is_required

parameter to

False

. Here's an example based on the documentation:

python
from dagster import op, Out, Output

@op(out=Out(is_required=False))
def my_optional_output_op():
    # Your op logic here
    # Conditionally yield an Output if you have a result to emit
    if some_condition:
        yield Output(value)

In this example,

my_optional_output_op

has an optional output. If

some_condition

is

True

, the op yields an

Output

object with the value. If

some_condition

is

False

, the op does not yield an

Output

, and downstream ops that depend on this output will not execute unless they are also configured to handle optional inputs. Asset with optional output is not recogn... button Make

Output

a generic type, and use th... button Collected DynamicOutput that did not fir... button Dagster Docs button Thank you for your feedback!