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Improve error message in ListTransformer when not passing a list #1882

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merged 1 commit into from
Oct 10, 2023
Merged

Improve error message in ListTransformer when not passing a list #1882

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7 changes: 6 additions & 1 deletion flytekit/core/type_engine.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1141,7 +1141,12 @@ def to_python_value(self, ctx: FlyteContext, lv: Literal, expected_python_type:
try:
lits = lv.collection.literals
except AttributeError:
raise TypeTransformerFailedError()
raise TypeTransformerFailedError(
(
f"The expected python type is '{expected_python_type}' but the received Flyte literal value "
f"is not a collection (Flyte's representation of Python lists)."
)
)
if self.is_batchable(expected_python_type):
from flytekit.types.pickle import FlytePickle

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