eladkal edited a comment on issue #18454:
URL: https://github.com/apache/airflow/issues/18454#issuecomment-925615907
I am able to reproduce with your code but this is because your code has a
bug.
The decision function:
```
def decision(**kwargs):
ingredient = kwargs["ti"].xcom_pull(key="ingredient")
# should you put it on pizza?
if ingredient in ingredients[:3]:
return "order_pizza"
elif ingredient in ingredients[4:6]:
return "sandwich_instead"
elif ingredient in ingredients[7:]:
return "ask_advice"
```
doesn't cover all possible cases. so when `pick_random_ingredient` hits
`mayonase` the decision will return `None` resulting in the error you
experienced. Since `pick_random_ingredient` picks items from the list randomly
it also produce the error randomly depends when `mayonase` is selected.
```
a[:stop] # items from the beginning through stop-1
a[start:stop] # items start through stop-1
a[start:] # items start through the rest of the array
```
So:
```
ingredients = [
"pineapple",
"jalapeno",
"feta",
"mayonase",
"fish",
"sauerkraut",
"chocolate",
"ice cream",
"potato chips",
]
ingredients[:3] # items from the beginning through 2 (stop-1):
['pineapple', 'jalapeno', 'feta']
ingredients[4:6] # items start through 4 to 6: ['fish', 'sauerkraut']
ingredients[7:] #tems start from 7 to the end: ['ice cream', 'potato chips']
```
which causes you to miss `mayonase` as it's in place 3.
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