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Catch mutable default argument #1685

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@eapolinario eapolinario commented May 23, 2024

Signed-off-by: Eduardo Apolinario <[email protected]>
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As expected, the lint job failed with:

examples/advanced_composition/advanced_composition/map_task.py:13:36: B006 Do not use mutable data structures for argument defaults
examples/advanced_composition/advanced_composition/map_task.py:56:54: B006 Do not use mutable data structures for argument defaults
examples/advanced_composition/advanced_composition/map_task.py:69:63: B006 Do not use mutable data structures for argument defaults
examples/advanced_composition/advanced_composition/map_task.py:79:25: B006 Do not use mutable data structures for argument defaults
examples/advanced_composition/advanced_composition/map_task.py:79:64: B006 Do not use mutable data structures for argument defaults
examples/advanced_composition/advanced_composition/subworkflow.py:33:53: B006 Do not use mutable data structures for argument defaults
examples/advanced_composition/advanced_composition/subworkflow.py:33:80: B006 Do not use mutable data structures for argument defaults
examples/basics/basics/documenting_workflows.py:11:40: B006 Do not use mutable data structures for argument defaults
examples/basics/basics/documenting_workflows.py:11:67: B006 Do not use mutable data structures for argument defaults
examples/basics/basics/documenting_workflows.py:29:39: B006 Do not use mutable data structures for argument defaults
examples/basics/basics/documenting_workflows.py:29:66: B006 Do not use mutable data structures for argument defaults
examples/basics/basics/documenting_workflows.py:55:40: B006 Do not use mutable data structures for argument defaults
examples/basics/basics/documenting_workflows.py:55:67: B006 Do not use mutable data structures for argument defaults
examples/basics/basics/named_outputs.py:36:49: B006 Do not use mutable data structures for argument defaults
examples/basics/basics/named_outputs.py:36:76: B006 Do not use mutable data structures for argument defaults
examples/data_types_and_io/data_types_and_io/pickle_type.py:54:[24](https://github.com/flyteorg/flytesnacks/actions/runs/9212079968/job/25342931456?pr=1685#step:7:25): B006 Do not use mutable data structures for argument defaults
examples/data_types_and_io/data_types_and_io/pickle_type.py:55:25: B006 Do not use mutable data structures for argument defaults
examples/pandera_plugin/pandera_plugin/basic_schema_example.py:120:18: B006 Do not use mutable data structures for argument defaults
examples/pandera_plugin/pandera_plugin/basic_schema_example.py:124:36: B006 Do not use mutable data structures for argument defaults
Found 19 errors.
No fixes available (19 hidden fixes can be enabled with the `--unsafe-fixes` option).

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Looking into this again, I'm not certain we should enable this in flytesnacks examples by default. I know it propagates an anti-pattern, but at the same time, at least for workflows (and soon tasks too) it's pretty handy to have things like default lists and for the simple case we can't misuse the feature (since the lists won't be modified between task executions).

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