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https://issues.apache.org/jira/browse/BEAM-14547?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17550109#comment-17550109
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Danny McCormick commented on BEAM-14547:
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This issue has been migrated to https://github.com/apache/beam/issues/21671
> Bug in type inference for Python 3.10
> -------------------------------------
>
> Key: BEAM-14547
> URL: https://issues.apache.org/jira/browse/BEAM-14547
> Project: Beam
> Issue Type: Bug
> Components: sdk-py-core
> Reporter: Anand Inguva
> Assignee: Anand Inguva
> Priority: P2
>
> After debugging, the issue arises here
> [https://github.com/apache/beam/blob/70cee1d125db0b62b2d660fc399e5a23845eb0e3/sdks/python/apache_beam/typehints/trivial_inference.py#L328]
> The method above is not able to infer outputs properly in Python 3.10 and
> results in an outputting wrong output type.
> {code:java}
> # Python <= 3.9
> from apache_beam.typehints.trivial_inference import infer_return_type_func
> fn = lambda x: False
> wrapper = lambda x, *args, **kwargs: [x] if fn(x, *args, **kwargs) else []
> output_type = infer_return_type_func(wrapper, [int])
> # output_type would be List[int]
> # Python == 3.10
> output_type = infer_return_type_func(wrapper, [int])
> # fails with error beam/sdks/python/apache_beam/typehints/opcodes.py", line #
> 322, in dict_update base = state.stack[-arg]
> # IndexError: list index out of range
> # in python 3.9
> from dis import dis
> print(dis(wrapper))
> '''
> 1 0 LOAD_GLOBAL 0 (fn)
> 2 LOAD_FAST 0 (x)
> 4 BUILD_LIST 1
> 6 LOAD_FAST 1 (args)
> 8 LIST_EXTEND 1
> 10 LIST_TO_TUPLE
> 12 BUILD_MAP 0
> 14 LOAD_FAST 2 (kwargs)
> 16 DICT_MERGE 1
> 18 CALL_FUNCTION_EX 1
> 20 POP_JUMP_IF_FALSE 28
> 22 LOAD_FAST 0 (x)
> 24 BUILD_LIST 1
> 26 RETURN_VALUE
> >> 28 BUILD_LIST 0
> 30 RETURN_VALUE
> '''
> # in python 3.10
> print(dis(wrapper))
> '''
> 1 0 LOAD_GLOBAL 0 (fn)
> 2 LOAD_FAST 0 (x)
> 4 BUILD_LIST 1
> 6 LOAD_FAST 1 (args)
> 8 LIST_EXTEND 1
> 10 LIST_TO_TUPLE
> 12 BUILD_MAP 0
> 14 LOAD_FAST 2 (kwargs)
> 16 DICT_MERGE 1
> 18 CALL_FUNCTION_EX 1
> 20 POP_JUMP_IF_FALSE 14 (to 28)
> 22 LOAD_FAST 0 (x)
> 24 BUILD_LIST 1
> 26 RETURN_VALUE
> >> 28 BUILD_LIST 0
> 30 RETURN_VALUE
> '''
> {code}
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