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fix(_transform): guard bare dict annotation to avoid IndexError #1629

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fix(_transform): guard bare dict annotation to avoid IndexError #1629

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6 changes: 4 additions & 2 deletions src/anthropic/_utils/_transform.py
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Original file line number Diff line number Diff line change
Expand Up @@ -180,7 +180,8 @@ def _transform_recursive(
return _transform_typeddict(data, stripped_type)

if origin == dict and is_mapping(data):
items_type = get_args(stripped_type)[1]
args = get_args(stripped_type)
items_type = args[1] if len(args) >= 2 else Any
return {key: _transform_recursive(value, annotation=items_type) for key, value in data.items()}

if (
Expand Down Expand Up @@ -346,7 +347,8 @@ async def _async_transform_recursive(
return await _async_transform_typeddict(data, stripped_type)

if origin == dict and is_mapping(data):
items_type = get_args(stripped_type)[1]
args = get_args(stripped_type)
items_type = args[1] if len(args) >= 2 else Any
return {key: _transform_recursive(value, annotation=items_type) for key, value in data.items()}

if (
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9 changes: 9 additions & 0 deletions tests/test_transform.py
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Original file line number Diff line number Diff line change
Expand Up @@ -458,3 +458,12 @@ async def test_strips_notgiven(use_async: bool) -> None:
async def test_strips_omit(use_async: bool) -> None:
assert await transform({"foo_bar": "bar"}, Foo1, use_async) == {"fooBar": "bar"}
assert await transform({"foo_bar": omit}, Foo1, use_async) == {}


@parametrize
@pytest.mark.asyncio
async def test_transform_recursive_bare_dict_no_index_error(use_async: bool) -> None:
# A bare (unparameterized) `dict` annotation must not raise IndexError when
# get_args(dict) returns () and the code tries to index position [1].
result = await transform({"key": "value"}, dict, use_async)
assert result == {"key": "value"}