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fix(narrowing): propagate walrus narrowing from inside and expressions (closes #19430)#21147

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traveltamers wants to merge 4 commits intopython:masterfrom
traveltamers:bugfix/walrus-narrowing-in-and-expression
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fix(narrowing): propagate walrus narrowing from inside and expressions (closes #19430)#21147
traveltamers wants to merge 4 commits intopython:masterfrom
traveltamers:bugfix/walrus-narrowing-in-and-expression

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@traveltamers traveltamers commented Apr 2, 2026

Summary

Fixes #19430 — walrus operator (:=) type narrowing was not being propagated when the assignment appeared inside the right operand of an and expression.

Root cause

find_isinstance_check_helper's and branch called find_isinstance_check on both operands to collect narrowing maps, but find_isinstance_check only surfaces top-level AssignmentExpr nodes (via _propagate_walrus_assignments). Walrus assignments buried deeper in the right operand — e.g. inside an arithmetic expression like (x := get_value()) + n — were silently dropped.

Fix

Add _collect_walrus_type_map to TypeChecker. Unlike the existing _propagate_walrus_assignments, this method recurses into arbitrary expression trees (OpExpr, CallExpr, UnaryExpr, MemberExpr, IndexExpr, TupleExpr, ListExpr) looking for any nested AssignmentExpr nodes and registers each one's inferred type in the provided map.

Call it in the and branch immediately after find_isinstance_check(node.right), merging results into right_if_vars. In the true branch of (A and B), evaluation of B is guaranteed, so all walrus assignments within B have definitely executed and their narrowed types should be visible.

Before / after

# Before this fix — mypy did NOT narrow woo to int in the if branch
def main(cond: bool, n: int) -> None:
    woo = None
    if cond and (woo := 5) + n:
        reveal_type(woo)   # was: int | None  (wrong)
# After this fix
def main(cond: bool, n: int) -> None:
    woo = None
    if cond and (woo := 5) + n:
        reveal_type(woo)   # now: int  (correct)

Files changed

  • mypy/checker.py — new _collect_walrus_type_map method + one call in find_isinstance_check_helper
    -SAM

traveltamers and others added 4 commits April 2, 2026 12:17
@traveltamers
fix(narrowing): add _collect_walrus_type_map and call it in and branch
ec334c4 
Add _collect_walrus_type_map to TypeChecker that recursively walks arbitrary expression trees collecting AssignmentExpr type narrowings. Call it in find_isinstance_check_helper's "and" branch to register walrus assignments from the right operand into the true-branch type map.
@traveltamers
fix(typo): restore correct import keyword in contextlib import
82d2147
@traveltamers
test(narrowing): add regression test for walrus narrowing in and op…
0b098ac 
…erand

Add regression tests for walrus operator behavior in nested expressions.
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[pre-commit.ci] auto fixes from pre-commit.com hooks
204a671 
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github-actions bot commented Apr 2, 2026

Diff from mypy_primer, showing the effect of this PR on open source code:

psycopg (https://github.com/psycopg/psycopg)
+ psycopg/psycopg/types/datetime.py:665: error: Incompatible return value type (got "bytes | None", expected "bytes")  [return-value]
+ psycopg/psycopg/types/datetime.py:672: error: Incompatible return value type (got "bytes | None", expected "bytes")  [return-value]

prefect (https://github.com/PrefectHQ/prefect)
+ src/prefect/_internal/concurrency/inspection.py:93: error: Argument 1 to "call_stack" has incompatible type "FrameType | None"; expected "FrameType"  [arg-type]
+ src/prefect/results.py:661: error: "None" not callable  [misc]
+ src/prefect/results.py:663: error: "None" not callable  [misc]
+ src/prefect/server/orchestration/core_policy.py:914: error: Item "None" of "ResourceLease[ConcurrencyLimitLeaseMetadata] | None" has no attribute "resource_ids"  [union-attr]
+ src/prefect/server/orchestration/core_policy.py:915: error: Item "None" of "ResourceLease[ConcurrencyLimitLeaseMetadata] | None" has no attribute "metadata"  [union-attr]
+ src/prefect/server/orchestration/core_policy.py:918: error: Item "None" of "ResourceLease[ConcurrencyLimitLeaseMetadata] | None" has no attribute "id"  [union-attr]
+ src/prefect/workers/base.py:234: error: Unsupported left operand type for | ("None")  [operator]
+ src/prefect/workers/base.py:234: note: Both left and right operands are unions

pydantic (https://github.com/pydantic/pydantic)
+ pydantic/json_schema.py:1128: error: Argument 1 to "generate_inner" of "GenerateJsonSchema" has incompatible type "Mapping[str, Any] | None"; expected "Mapping[str, Any] | ModelField | DataclassField | TypedDictField | ComputedField"  [arg-type]
+ pydantic/json_schema.py:1153: error: Argument 1 to "generate_inner" of "GenerateJsonSchema" has incompatible type "Mapping[str, Any] | None"; expected "Mapping[str, Any] | ModelField | DataclassField | TypedDictField | ComputedField"  [arg-type]
+ pydantic/json_schema.py:1169: error: Argument 1 to "generate_inner" of "GenerateJsonSchema" has incompatible type "Mapping[str, Any] | None"; expected "Mapping[str, Any] | ModelField | DataclassField | TypedDictField | ComputedField"  [arg-type]

mkosi (https://github.com/systemd/mkosi)
+ mkosi/installer/__init__.py:83:37: error: List item 1 has incompatible type "str | None"; expected "Path | str"  [list-item]
+ mkosi/installer/__init__.py:83:45: error: List item 2 has incompatible type "str | None"; expected "Path | str"  [list-item]
+ mkosi/qemu.py:1214:36: error: List item 1 has incompatible type "Path | None"; expected "Path | str"  [list-item]
+ mkosi/vmspawn.py:159:41: error: List item 1 has incompatible type "Path | None"; expected "Path | str"  [list-item]
+ mkosi/__init__.py:2046:23: error: Incompatible types in assignment (expression has type "list[str | None]", variable has type "list[str]")  [assignment]
+ mkosi/__init__.py:3830:77: error: Item "None" of "str | None" has no attribute "partition"  [union-attr]
+ mkosi/distribution/fedora.py:90:23: error: Item "None" of "Match[str] | None" has no attribute "group"  [union-attr]

colour (https://github.com/colour-science/colour)
+ colour/utilities/array.py:1295: error: Item "None" of "Match[str] | None" has no attribute "group"  [union-attr]

aiohttp (https://github.com/aio-libs/aiohttp)
+ aiohttp/connector.py:754:13: error: Item "None" of "set[ResponseHandler] | None" has no attribute "discard"  [union-attr]
+ aiohttp/connector.py:754:13: note: See https://mypy.rtfd.io/en/stable/_refs.html#code-union-attr for more info
+ aiohttp/client_ws.py:205:46: error: Argument 1 to "_handle_ping_pong_exception" of "ClientWebSocketResponse" has incompatible type "BaseException | None"; expected "BaseException"  [arg-type]
+ aiohttp/web_ws.py:229:46: error: Argument 1 to "_handle_ping_pong_exception" of "WebSocketResponse" has incompatible type "BaseException | None"; expected "BaseException"  [arg-type]

anyio (https://github.com/agronholm/anyio)
+ src/anyio/_backends/_asyncio.py:897: error: Value of type "Any | None" is not indexable  [index]

mypy (https://github.com/python/mypy)
+ mypy/type_visitor.py:299: error: Incompatible return value type (got "Type | None", expected "Type")  [return-value]
+ mypy/expandtype.py:574: error: Incompatible return value type (got "Type | None", expected "Type")  [return-value]
+ mypy/config_parser.py:712: error: Unsupported left operand type for + ("object")  [operator]
+ mypy/config_parser.py:712: note: See https://mypy.rtfd.io/en/stable/_refs.html#code-operator for more info
+ mypy/config_parser.py:718: error: Unsupported left operand type for + ("object")  [operator]
+ mypy/join.py:599: error: "Type" has no attribute "type"  [attr-defined]
+ mypy/join.py:601: error: Statement is unreachable  [unreachable]
+ mypy/join.py:601: note: See https://mypy.rtfd.io/en/stable/_refs.html#code-unreachable for more info
+ mypy/plugins/enums.py:95: error: Returning Any from function declared to return "Type | None"  [no-any-return]
+ mypy/plugins/enums.py:95: note: See https://mypy.rtfd.io/en/stable/_refs.html#code-no-any-return for more info
+ mypy/plugins/enums.py:95: error: Item "SymbolNode" of "SymbolNode | None" has no attribute "type"  [union-attr]
+ mypy/plugins/enums.py:95: error: Item "None" of "SymbolNode | None" has no attribute "type"  [union-attr]
+ mypy/plugins/enums.py:95: note: See https://mypy.rtfd.io/en/stable/_refs.html#code-union-attr for more info
+ mypy/semanal.py:1408: error: Returning Any from function declared to return "str | None"  [no-any-return]
+ mypy/semanal.py:1408: error: "Expression" has no attribute "value"  [attr-defined]
+ mypy/checker.py:3856: error: Item "None" of "TypeInfo | None" has no attribute "is_named_tuple"  [union-attr]
+ mypy/plugins/default.py:307: error: "ProperType" has no attribute "copy_modified"  [attr-defined]
+ mypy/stubgen.py:866: error: Item "None" of "DataclassTransformSpec | None" has no attribute "field_specifiers"  [union-attr]
+ mypy/suggestions.py:667: error: Item "ProperType" of "ProperType | None" has no attribute "ret_type"  [union-attr]
+ mypy/suggestions.py:667: error: Item "None" of "ProperType | None" has no attribute "ret_type"  [union-attr]
+ mypyc/irbuild/for_helpers.py:1304: error: "Expression" has no attribute "fullname"  [attr-defined]

altair (https://github.com/vega/altair)
+ tools/codemod.py:57: error: Argument 1 to "Path" has incompatible type "str | None"; expected "str | PathLike[str]"  [arg-type]
+ altair/datasets/_readimpl.py:265: error: Item "None" of "str | None" has no attribute "split"  [union-attr]
+ tools/update_init_file.py:167: error: Incompatible types in assignment (expression has type "str | None", variable has type "str | Path")  [assignment]

Tanjun (https://github.com/FasterSpeeding/Tanjun)
+ tanjun/dependencies/callbacks.py:75: error: Incompatible return value type (got "OwnUser | None", expected "OwnUser")  [return-value]
+ tanjun/conversion.py:344: error: Value of type variable "_PartialChannelT" of "_assert_type" of "ToChannel" cannot be "PermissibleGuildChannel | None"  [type-var]
+ tanjun/conversion.py:344: error: Incompatible return value type (got "PermissibleGuildChannel | None", expected "PartialChannel")  [return-value]
+ tanjun/conversion.py:437: error: Incompatible return value type (got "KnownCustomEmoji | None", expected "KnownCustomEmoji")  [return-value]
+ tanjun/conversion.py:494: error: Incompatible return value type (got "GatewayGuild | None", expected "Guild")  [return-value]
+ tanjun/conversion.py:546: error: Incompatible return value type (got "InviteWithMetadata | None", expected "Invite")  [return-value]
+ tanjun/conversion.py:607: error: Incompatible return value type (got "InviteWithMetadata | None", expected "InviteWithMetadata")  [return-value]
+ tanjun/conversion.py:671: error: Incompatible return value type (got "Member | None", expected "Member")  [return-value]
+ tanjun/conversion.py:744: error: Incompatible return value type (got "MemberPresence | None", expected "MemberPresence")  [return-value]
+ tanjun/conversion.py:787: error: Incompatible return value type (got "Role | None", expected "Role")  [return-value]
+ tanjun/conversion.py:843: error: Incompatible return value type (got "User | None", expected "User")  [return-value]
+ tanjun/conversion.py:905: error: Incompatible return value type (got "Message | None", expected "Message")  [return-value]
+ tanjun/conversion.py:973: error: Incompatible return value type (got "VoiceState | None", expected "VoiceState")  [return-value]
+ tanjun/_internal/cache.py:74: error: Incompatible return value type (got "PermissibleGuildChannel | None", expected "PermissibleGuildChannel")  [return-value]
+ tanjun/_internal/cache.py:82: error: Incompatible return value type (got "PermissibleGuildChannel | None", expected "PermissibleGuildChannel")  [return-value]
+ tanjun/_internal/cache.py:100: error: Incompatible return value type (got "PermissibleGuildChannel | None", expected "PermissibleGuildChannel")  [return-value]
+ tanjun/parsing.py:588: error: Argument 2 to "convert" of "Parameter" has incompatible type "str | None"; expected "str"  [arg-type]
+ tanjun/dependencies/locales.py:123: error: Item "None" of "Match[str] | None" has no attribute "groups"  [union-attr]
+ tanjun/dependencies/locales.py:140: error: Item "None" of "str | None" has no attribute "format"  [union-attr]
+ tanjun/dependencies/locales.py:143: error: Item "None" of "str | None" has no attribute "format"  [union-attr]
+ tanjun/checks.py:532: error: Argument 2 to "fetch_permissions" has incompatible type "Member | None"; expected "Member"  [arg-type]
+ tanjun/clients.py:1540: error: Item "None" of "AppCommand[Any] | None" has no attribute "set_tracked_command"  [union-attr]
+ tanjun/clients.py:2379: error: Item "None" of "SingleStoreCache[OwnUser] | None" has no attribute "get"  [union-attr]
+ tanjun/clients.py:2400: error: Argument 1 to "subscribe" of "EventManager" has incompatible type "type[MessageCreateEvent] | None"; expected "type[Any]"  [arg-type]

core (https://github.com/home-assistant/core)
+ homeassistant/helpers/translation.py:82: error: Value expression in dictionary comprehension has incompatible type "dict[str, Any] | str | None"; expected type "dict[str, Any] | str"  [misc]
+ homeassistant/helpers/translation.py:127: error: Item "None" of "Integration | None" has no attribute "name"  [union-attr]
+ homeassistant/helpers/entity_registry.py:298: error: Item "None" of "ReadOnlyDict[str, Any] | None" has no attribute "get"  [union-attr]
+ homeassistant/helpers/entity_registry.py:299: error: Item "None" of "ReadOnlyDict[str, Any] | None" has no attribute "get"  [union-attr]
+ homeassistant/helpers/template/helpers.py:65: error: Item "None" of "DeviceEntry | None" has no attribute "area_id"  [union-attr]
+ homeassistant/helpers/template/__init__.py:921: error: Unused "type: ignore" comment  [unused-ignore]
+ homeassistant/helpers/template/__init__.py:921: error: Item "None" of "RenderInfo | None" has no attribute "entities"  [union-attr]
+ homeassistant/helpers/template/__init__.py:921: note: Error code "union-attr" not covered by "type: ignore" comment
+ homeassistant/helpers/template/__init__.py:921: error: Item "AbstractSet[str]" of "AbstractSet[str] | Any" has no attribute "add"  [union-attr]
+ homeassistant/helpers/template/__init__.py:930: error: Unused "type: ignore" comment  [unused-ignore]
+ homeassistant/helpers/template/__init__.py:930: error: Item "None" of "RenderInfo | None" has no attribute "entities"  [union-attr]
+ homeassistant/helpers/template/__init__.py:930: note: Error code "union-attr" not covered by "type: ignore" comment
+ homeassistant/helpers/template/__init__.py:930: error: Item "AbstractSet[str]" of "AbstractSet[str] | Any" has no attribute "add"  [union-attr]
+ homeassistant/helpers/entity.py:728: error: Argument 1 to "_substitute_name_placeholders" of "Entity" has incompatible type "str | None"; expected "str"  [arg-type]
+ homeassistant/config_entries.py:588: error: Item "None" of "type[ConfigFlow] | None" has no attribute "async_supports_options_flow"  [union-attr]
+ homeassistant/config_entries.py:613: error: Item "None" of "type[ConfigFlow] | None" has no attribute "async_get_supported_subentry_types"  [union-attr]
+ homeassistant/config_entries.py:1576: error: Item "None" of "Future[None] | None" has no attribute "set_result"  [union-attr]
+ homeassistant/config_entries.py:1632: error: Item "None" of "ConfigEntry[Any] | None" has no attribute "discovery_keys"  [union-attr]
+ homeassistant/config_entries.py:1641: error: Item "None" of "ConfigEntry[Any] | None" has no attribute "domain"  [union-attr]
+ homeassistant/config_entries.py:1643: error: Item "None" of "ConfigEntry[Any] | None" has no attribute "discovery_keys"  [union-attr]
+ homeassistant/config_entries.py:1647: error: Argument 1 to "async_update_entry" of "ConfigEntries" has incompatible type "ConfigEntry[Any] | None"; expected "ConfigEntry[Any]"  [arg-type]
+ homeassistant/config_entries.py:4066: error: Incompatible return value type (got "type[ConfigFlow] | None", expected "type[ConfigFlow]")  [return-value]
+ homeassistant/helpers/integration_platform.py:137: error: List comprehension has incompatible type List[Future[Awaitable[None] | None] | None]; expected List[Future[Awaitable[None] | None]]  [misc]
+ homeassistant/components/websocket_api/auth.py:104: error: Item "None" of "RefreshToken | None" has no attribute "user"  [union-attr]
+ homeassistant/components/websocket_api/auth.py:109: error: Item "None" of "RefreshToken | None" has no attribute "id"  [union-attr]
+ homeassistant/helpers/schema_config_entry_flow.py:193: error: Item "None" of "Schema | None" has no attribute "schema"  [union-attr]
+ homeassistant/components/zeroconf/discovery.py:365: error: Argument 1 to "_async_check_instance_id_conflict" of "ZeroconfDiscovery" has incompatible type "str | None"; expected "str"  [arg-type]
+ homeassistant/components/zeroconf/discovery.py:380: error: Item "None" of "HomeKitDiscoveredIntegration | None" has no attribute "domain"  [union-attr]
+ homeassistant/components/zeroconf/discovery.py:383: error: Item "None" of "HomeKitDiscoveredIntegration | None" has no attribute "domain"  [union-attr]
+ homeassistant/components/zeroconf/discovery.py:395: error: Item "None" of "HomeKitDiscoveredIntegration | None" has no attribute "always_discover"  [union-attr]
+ homeassistant/components/hassio/coordinator.py:454: error: Item "None" of "DeviceEntry | None" has no attribute "id"  [union-attr]
+ homeassistant/components/lock/__init__.py:302: error: Argument 1 to "match" of "Pattern" has incompatible type "Any | None"; expected "str"  [arg-type]
+ homeassistant/components/lock/__init__.py:304: error: Incompatible types in assignment (expression has type "Any | None", variable has type "str")  [assignment]
+ homeassistant/components/light/__init__.py:899: error: Value of type "tuple[float, float] | None" is not indexable  [index]
+ homeassistant/components/light/__init__.py:900: error: Expected iterable as variadic argument  [misc]
+ homeassistant/components/light/__init__.py:901: error: Expected iterable as variadic argument  [misc]
+ homeassistant/components/light/__init__.py:903: error: Expected iterable as variadic argument  [misc]
+ homeassistant/components/light/__init__.py:904: error: Expected iterable as variadic argument  [misc]
+ homeassistant/components/light/__init__.py:905: error: Value of type "tuple[float, float] | None" is not indexable  [index]
+ homeassistant/components/light/__init__.py:907: error: Expected iterable as variadic argument  [misc]
+ homeassistant/components/light/__init__.py:908: error: Value of type "tuple[int, int, int] | None" is not indexable  [index]
+ homeassistant/components/light/__init__.py:909: error: Expected iterable as variadic argument  [misc]
+ homeassistant/components/light/__init__.py:913: error: Expected iterable as variadic argument  [misc]
+ homeassistant/components/light/__init__.py:916: error: Value of type "tuple[int, int, int, int] | None" is not indexable  [index]
+ homeassistant/components/light/__init__.py:919: error: Too many arguments for "color_rgbww_to_rgb"  [call-arg]
+ homeassistant/components/light/__init__.py:919: error: Expected iterable as variadic argument  [misc]
+ homeassistant/components/light/__init__.py:924: error: Value of type "tuple[int, int, int, int, int] | None" is not indexable  [index]
+ homeassistant/components/light/__init__.py:929: error: Argument 1 to "color_temperature_to_hs" has incompatible type "int | None"; expected "float"  [arg-type]
+ homeassistant/components/event/__init__.py:198: error: Item "None" of "EventExtraStoredData | None" has no attribute "last_event_type"  [union-attr]
+ homeassistant/components/event/__init__.py:199: error: Item "None" of "EventExtraStoredData | None" has no attribute "last_event_attributes"  [union-attr]
+ homeassistant/components/sensor/__init__.py:406: error: Item "None" of "type[BaseUnitConverter] | None" has no attribute "UNIT_CLASS"  [union-attr]
+ homeassistant/components/sensor/__init__.py:533: error: Argument 1 to "_is_valid_suggested_unit" of "SensorEntity" has incompatible type "str | None"; expected "str"  [arg-type]
+ homeassistant/components/sensor/__init__.py:714: error: Item "None" of "type[BaseUnitConverter] | None" has no attribute "converter_factory"  [union-attr]
+ homeassistant/components/stream/hls.py:393: error: Item "None" of "Segment | None" has no attribute "parts"  [union-attr]
+ homeassistant/components/stream/hls.py:395: error: Item "None" of "Segment | None" has no attribute "parts"  [union-attr]
+ homeassistant/components/stream/hls.py:398: error: Item "None" of "Segment | None" has no attribute "parts"  [union-attr]
+ homeassistant/components/stream/hls.py:435: error: Item "None" of "Segment | None" has no attribute "get_data"  [union-attr]
+ homeassistant/components/intent/timers.py:296: error: Item "None" of "DeviceEntry | None" has no attribute "area_id"  [union-attr]
+ homeassistant/components/intent/timers.py:298: error: Item "None" of "DeviceEntry | None" has no attribute "area_id"  [union-attr]
+ homeassistant/components/intent/timers.py:299: error: Item "None" of "DeviceEntry | None" has no attribute "area_id"  [union-attr]
+ homeassistant/components/intent/timers.py:301: error: Item "None" of "AreaEntry | None" has no attribute "name"  [union-attr]
+ homeassistant/components/intent/timers.py:302: error: Item "None" of "AreaEntry | None" has no attribute "floor_id"  [union-attr]
+ homeassistant/components/intent/timers.py:628: error: Item "None" of "AreaEntry | None" has no attribute "id"  [union-attr]
+ homeassistant/components/intent/timers.py:636: error: Item "None" of "AreaEntry | None" has no attribute "floor_id"  [union-attr]
+ homeassistant/components/group/event.py:148: error: Item "None" of "State | None" has no attribute "attributes"  [union-attr]
+ homeassistant/components/group/event.py:158: error: Argument 1 to "_trigger_event" of "EventEntity" has incompatible type "Any | None"; expected "str"  [arg-type]
+ homeassistant/components/intent/__init__.py:560: error: Item "None" of "AreaEntry | None" has no attribute "temperature_entity_id"  [union-attr]
+ homeassistant/components/script/__init__.py:769: error: Argument 1 to "parse_datetime" has incompatible type "Any | None"; expected "str"  [arg-type]
+ homeassistant/helpers/llm.py:297: error: Item "None" of "AreaEntry | None" has no attribute "floor_id"  [union-attr]
+ homeassistant/helpers/llm.py:299: error: Item "None" of "AreaEntry | None" has no attribute "floor_id"  [union-attr]
+ homeassistant/helpers/llm.py:513: error: Item "None" of "AreaEntry | None" has no attribute "floor_id"  [union-attr]
+ homeassistant/helpers/llm.py:514: error: Item "None" of "AreaEntry | None" has no attribute "floor_id"  [union-attr]
+ homeassistant/components/tts/__init__.py:920: error: Value of type variable "AnyOrLiteralStr" of "splitext" cannot be "str | None"  [type-var]
+ homeassistant/components/tts/__init__.py:920: error: Value of type "str | None" is not indexable  [index]
+ homeassistant/components/conversation/chat_log.py:720: error: Item "None" of "User | None" has no attribute "name"  [union-attr]
+ homeassistant/components/assist_pipeline/select.py:110: error: Invalid index type "str | None" for "dict[str, AssistDevice]"; expected type "str"  [index]
+ homeassistant/components/assist_pipeline/select.py:116: error: Argument 1 to "pop" of "dict" has incompatible type "str | None"; expected "str"  [arg-type]
+ homeassistant/components/bluetooth/match.py:264: error: Item "None" of "list[BluetoothMatcher] | None" has no attribute "__iter__" (not iterable)  [union-attr]
+ homeassistant/components/bluetooth/match.py:264: error: Item "None" of "list[BluetoothCallbackMatcherWithCallback] | None" has no attribute "__iter__" (not iterable)  [union-attr]
+ homeassistant/components/bluetooth/passive_update_processor.py:484: error: Argument 1 to "async_set_restore_data" of "PassiveBluetoothDataUpdate" has incompatible type "RestoredPassiveBluetoothDataUpdate | None"; expected "RestoredPassiveBluetoothDataUpdate"  [arg-type]
+ homeassistant/components/bluetooth/__init__.py:342: error: Item "None" of "DeviceEntry | None" has no attribute "area_id"  [union-attr]
+ homeassistant/components/bluetooth/__init__.py:343: error: Item "None" of "DeviceEntry | None" has no attribute "area_id"  [union-attr]
+ homeassistant/components/xbox/coordinator.py:265: error: Item "None" of "Any | None" has no attribute "last_seen_date_time_utc"  [union-attr]
+ homeassistant/components/universal/media_player.py:662: error: Item "None" of "MediaPlayerEntity | None" has no attribute "async_browse_media"  [union-attr]
+ homeassistant/components/tag/__init__.py:221: error: Item "None" of "RegistryEntry | None" has no attribute "name"  [union-attr]
+ homeassistant/components/tag/__init__.py:221: error: Item "None" of "RegistryEntry | None" has no attribute "original_name"  [union-attr]
+ homeassistant/components/tag/__init__.py:337: error: Item "None" of "RegistryEntry | None" has no attribute "name"  [union-attr]
+ homeassistant/components/tag/__init__.py:337: error: Item "None" of "RegistryEntry | None" has no attribute "original_name"  [union-attr]
+ homeassistant/components/search/__init__.py:572: error: Item "None" of "DeviceEntry | None" has no attribute "area_id"  [union-attr]
+ homeassistant/components/search/__init__.py:573: error: Item "None" of "DeviceEntry | None" has no attribute "area_id"  [union-attr]
+ homeassistant/components/search/__init__.py:574: error: Item "None" of "DeviceEntry | None" has no attribute "area_id"  [union-attr]
+ homeassistant/components/schlage/coordinator.py:89: error: Item "None" of "LockData | None" has no attribute "logs"  [union-attr]
+ homeassistant/components/samsungtv/bridge.py:502: error: Item "None" of "Any | None" has no attribute "get"  [union-attr]
+ homeassistant/components/rfxtrx/__init__.py:442: error: Item "None" of "bytes | None" has no attribute "decode"  [union-attr]
+ homeassistant/components/recorder/system_health/__init__.py:43: error: Unsupported operand types for / ("None" and "int")  [operator]
+ homeassistant/components/recorder/system_health/__init__.py:43: note: Left operand is of type "float | None"
+ homeassistant/components/rainforest_raven/coordinator.py:98: error: Argument 1 to <set> has incompatible type "tuple[str, str | None]"; expected "tuple[str, str]"  [arg-type]
+ homeassistant/components/portainer/coordinator.py:204: error: Item "None" of "PortainerStackData | None" has no attribute "container_count"  [union-attr]
+ homeassistant/components/glances/coordinator.py:58: error: No overload variant of "__sub__" of "datetime" matches argument type "None"  [operator]
+ homeassistant/components/glances/coordinator.py:58: note: Possible overload variants:
+ homeassistant/components/glances/coordinator.py:58: note:     def __sub__(self, datetime, /) -> timedelta
+ homeassistant/components/glances/coordinator.py:58: note:     def __sub__(self, timedelta, /) -> datetime
+ homeassistant/components/glances/coordinator.py:58: note: Right operand is of type "timedelta | None"
+ homeassistant/components/configurator/__init__.py:257: error: Incompatible types in "await" (actual type "Future[None] | None", expected type "Awaitable[Any]")  [misc]
+ homeassistant/components/cloud/entity.py:331: error: Item "None" of "Match[str] | None" has no attribute "span"  [union-attr]
+ homeassistant/components/api/__init__.py:428: error: Item "None" of "State | None" has no attribute "json_fragment"  [union-attr]
+ homeassistant/helpers/template/extensions/floors.py:110: error: Item "None" of "FloorEntry | None" has no attribute "name"  [union-attr]
+ homeassistant/helpers/template/extensions/devices.py:114: error: Item "None" of "DeviceEntry | None" has no attribute "name_by_user"  [union-attr]
+ homeassistant/helpers/template/extensions/devices.py:114: error: Item "None" of "DeviceEntry | None" has no attribute "name"  [union-attr]
+ homeassistant/helpers/template/extensions/areas.py:111: error: Item "None" of "DeviceEntry | None" has no attribute "area_id"  [union-attr]
+ homeassistant/components/xiaomi_miio/__init__.py:391: error: Argument "title" to "async_update_entry" of "ConfigEntries" has incompatible type "str | None"; expected "str | UndefinedType"  [arg-type]
+ homeassistant/components/vodafone_station/coordinator.py:127: error: No overload variant of "__sub__" of "datetime" matches argument type "None"  [operator]
+ homeassistant/components/vodafone_station/coordinator.py:127: note: Possible overload variants:
+ homeassistant/components/vodafone_station/coordinator.py:127: note:     def __sub__(self, datetime, /) -> timedelta
+ homeassistant/components/vodafone_station/coordinator.py:127: note:     def __sub__(self, timedelta, /) -> datetime
+ homeassistant/components/vodafone_station/coordinator.py:127: note: Right operand is of type "datetime | None"
+ homeassistant/components/unifiprotect/entity.py:141: error: Argument 1 to "extend" of "list" has incompatible type "Sequence[ProtectEntityDescription[Any]] | None"; expected "Iterable[ProtectEntityDescription[Any]]"  [arg-type]
+ homeassistant/components/systemmonitor/config_flow.py:47: error: Argument 1 to "async_remove" of "EntityRegistry" has incompatible type "str | None"; expected "str"  [arg-type]
+ homeassistant/components/steam_online/config_flow.py:140: error: Argument 1 to "async_remove" of "EntityRegistry" has incompatible type "str | None"; expected "str"  [arg-type]

... (truncated 123 lines) ...

CPython (cases_generator) (https://github.com/python/cpython)
+ Tools/cases_generator/parsing.py:397: error: Item "None" of "Token | None" has no attribute "text"  [union-attr]

sphinx (https://github.com/sphinx-doc/sphinx)
+ sphinx/ext/autodoc/_dynamic/_docstrings.py: note: In function "_get_docstring_lines":
+ sphinx/ext/autodoc/_dynamic/_docstrings.py:264:47: error: Argument 1 to "prepare_docstring" has incompatible type "Any | None"; expected "str"  [arg-type]
+ sphinx/ext/autodoc/_dynamic/_member_finder.py: note: In function "_sort_members":
+ sphinx/ext/autodoc/_dynamic/_member_finder.py:603:68: error: Argument 1 to "enumerate" has incompatible type "Sequence[str] | None"; expected "Iterable[str]"  [arg-type]
+ sphinx/ext/autodoc/_dynamic/_member_finder.py:604:34: error: Argument 1 to "len" has incompatible type "Sequence[str] | None"; expected "Sized"  [arg-type]
+ sphinx/ext/autodoc/_legacy_class_based/_documenters.py: note: In member "get_doc" of class "SlotsMixin":
+ sphinx/ext/autodoc/_legacy_class_based/_documenters.py:2493:51: error: Argument 1 to "prepare_docstring" has incompatible type "Any | None"; expected "str"  [arg-type]

pytest (https://github.com/pytest-dev/pytest)
+ src/_pytest/raises.py:1167: error: Item "RaisesExc[BaseExcT_co]" of "type[BaseExcT_co] | RaisesExc[BaseExcT_co] | RaisesGroup[BaseException]" has no attribute "__name__"  [union-attr]
+ src/_pytest/raises.py:1167: error: Item "RaisesGroup[BaseException]" of "type[BaseExcT_co] | RaisesExc[BaseExcT_co] | RaisesGroup[BaseException]" has no attribute "__name__"  [union-attr]
+ src/_pytest/raises.py:1218: error: Item "RaisesExc[BaseExcT_co]" of "type[BaseExcT_co] | RaisesExc[BaseExcT_co] | RaisesGroup[BaseException]" has no attribute "__name__"  [union-attr]
+ src/_pytest/raises.py:1218: error: Item "RaisesGroup[BaseException]" of "type[BaseExcT_co] | RaisesExc[BaseExcT_co] | RaisesGroup[BaseException]" has no attribute "__name__"  [union-attr]

mitmproxy (https://github.com/mitmproxy/mitmproxy)
+ mitmproxy/proxy/server.py:160: error: Argument "exc_info" to "log" of "ConnectionHandler" has incompatible type "tuple[type[BaseException] | type[None], BaseException | None, TracebackType | Any | None]"; expected "Literal[True] | tuple[type[BaseException], BaseException, TracebackType | None] | None"  [arg-type]
+ mitmproxy/proxy/server.py:160: error: Item "None" of "BaseException | None" has no attribute "__traceback__"  [union-attr]

dd-trace-py (https://github.com/DataDog/dd-trace-py)
+ ddtrace/internal/telemetry/writer.py:207: error: Argument 1 to "_get_event" of "TelemetryWriter" has incompatible type "dict[str, Any] | None"; expected "dict[str, Any] | list[Any]"  [arg-type]
+ ddtrace/appsec/_trace_utils.py:98: error: Item "None" of "Span | None" has no attribute "_service_entry_span"  [union-attr]
+ ddtrace/testing/internal/session_manager.py:411: error: Item "None" of "Match[str] | None" has no attribute "group"  [union-attr]

pylint (https://github.com/pycqa/pylint)
+ pylint/checkers/deprecated.py:116: error: Item "None" of "Any | None" has no attribute "value"  [union-attr]

jax (https://github.com/google/jax)
+ jax/_src/distributed.py:82: error: Item "None" of "str | None" has no attribute "split"  [union-attr]
+ jax/_src/export/shape_poly.py:1095: error: Item "None" of "_DimFactor | None" has no attribute "operands"  [union-attr]
+ jax/_src/export/shape_poly.py:1097: error: Item "None" of "_DimFactor | None" has no attribute "operands"  [union-attr]

koda-validate (https://github.com/keithasaurus/koda-validate)
+ koda_validate/dictionary.py:917: error: Argument 1 to "Invalid" has incompatible type "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items> | None"; expected "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items>"  [arg-type]
+ koda_validate/dictionary.py:950: error: Argument 1 to "Invalid" has incompatible type "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items> | None"; expected "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items>"  [arg-type]
+ koda_validate/dictionary.py:954: error: Argument 1 to "Invalid" has incompatible type "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items> | None"; expected "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items>"  [arg-type]
+ koda_validate/dictionary.py:1080: error: Argument 1 to "Invalid" has incompatible type "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items> | None"; expected "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items>"  [arg-type]
+ koda_validate/dictionary.py:1111: error: Argument 1 to "Invalid" has incompatible type "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items> | None"; expected "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items>"  [arg-type]
+ koda_validate/dictionary.py:1115: error: Argument 1 to "Invalid" has incompatible type "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items> | None"; expected "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items>"  [arg-type]
+ koda_validate/typeddict.py:199: error: Argument 1 to "Invalid" has incompatible type "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items> | None"; expected "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items>"  [arg-type]
+ koda_validate/typeddict.py:241: error: Argument 1 to "Invalid" has incompatible type "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items> | None"; expected "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items>"  [arg-type]
+ koda_validate/typeddict.py:245: error: Argument 1 to "Invalid" has incompatible type "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items> | None"; expected "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items>"  [arg-type]
+ koda_validate/namedtuple.py:206: error: Argument 1 to "Invalid" has incompatible type "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items> | None"; expected "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items>"  [arg-type]
+ koda_validate/namedtuple.py:257: error: Argument 1 to "Invalid" has incompatible type "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items> | None"; expected "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items>"  [arg-type]
+ koda_validate/namedtuple.py:261: error: Argument 1 to "Invalid" has incompatible type "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items> | None"; expected "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items>"  [arg-type]
+ koda_validate/dataclasses.py:213: error: Argument 1 to "Invalid" has incompatible type "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items> | None"; expected "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items>"  [arg-type]
+ koda_validate/dataclasses.py:265: error: Argument 1 to "Invalid" has incompatible type "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items> | None"; expected "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items>"  [arg-type]
+ koda_validate/dataclasses.py:269: error: Argument 1 to "Invalid" has incompatible type "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items> | None"; expected "CoercionErr | ContainerErr | ExtraKeysErr | IndexErrs | KeyErrs | <7 more items>"  [arg-type]

CPython (peg_generator) (https://github.com/python/cpython)
+ Tools/peg_generator/pegen/grammar_parser.py:66: error: Argument 1 to "Grammar" has incompatible type "list[Rule] | None"; expected "Iterable[Rule]"  [arg-type]
+ Tools/peg_generator/pegen/grammar_parser.py:84: error: No overload variant of "__add__" of "list" matches argument type "None"  [operator]
+ Tools/peg_generator/pegen/grammar_parser.py:84: note: Possible overload variants:
+ Tools/peg_generator/pegen/grammar_parser.py:84: note:     def __add__(self, list[tuple[str, str | None]], /) -> list[tuple[str, str | None]]
+ Tools/peg_generator/pegen/grammar_parser.py:84: note:     def [_S] __add__(self, list[_S], /) -> list[_S | tuple[str, str | None]]
+ Tools/peg_generator/pegen/grammar_parser.py:84: note: Right operand is of type "list[tuple[str, str | None]] | None"
+ Tools/peg_generator/pegen/grammar_parser.py:104: error: Item "None" of "TokenInfo | None" has no attribute "string"  [union-attr]
+ Tools/peg_generator/pegen/grammar_parser.py:115: error: Item "None" of "TokenInfo | None" has no attribute "string"  [union-attr]
+ Tools/peg_generator/pegen/grammar_parser.py:126: error: Item "None" of "TokenInfo | None" has no attribute "string"  [union-attr]
+ Tools/peg_generator/pegen/grammar_parser.py:139: error: No overload variant of "__add__" of "list" matches argument type "None"  [operator]
+ Tools/peg_generator/pegen/grammar_parser.py:139: note: Possible overload variants:
+ Tools/peg_generator/pegen/grammar_parser.py:139: note:     def __add__(self, list[Rule], /) -> list[Rule]
+ Tools/peg_generator/pegen/grammar_parser.py:139: note:     def [_S] __add__(self, list[_S], /) -> list[_S | Rule]
+ Tools/peg_generator/pegen/grammar_parser.py:139: note: Right operand is of type "list[Rule] | None"
+ Tools/peg_generator/pegen/grammar_parser.py:169: error: Item "None" of "Rhs | None" has no attribute "alts"  [union-attr]
+ Tools/peg_generator/pegen/grammar_parser.py:186: error: Argument 3 to "Rule" has incompatible type "Rhs | None"; expected "Rhs"  [arg-type]
+ Tools/peg_generator/pegen/grammar_parser.py:199: error: Argument 3 to "Rule" has incompatible type "Rhs | None"; expected "Rhs"  [arg-type]
+ Tools/peg_generator/pegen/grammar_parser.py:232: error: Argument 1 to "frozenset" has incompatible type "Any | None"; expected "Iterable[str]"  [arg-type]
+ Tools/peg_generator/pegen/grammar_parser.py:258: error: Item "None" of "Rhs | None" has no attribute "alts"  [union-attr]
+ Tools/peg_generator/pegen/grammar_parser.py:280: error: Item "None" of "Rhs | None" has no attribute "alts"  [union-attr]
+ Tools/peg_generator/pegen/grammar_parser.py:289: error: Item "None" of "Rhs | None" has no attribute "alts"  [union-attr]
+ Tools/peg_generator/pegen/grammar_parser.py:336: error: No overload variant of "__add__" of "list" matches argument type "None"  [operator]
+ Tools/peg_generator/pegen/grammar_parser.py:336: note: Possible overload variants:
+ Tools/peg_generator/pegen/grammar_parser.py:336: note:     def __add__(self, list[NamedItem], /) -> list[NamedItem]
+ Tools/peg_generator/pegen/grammar_parser.py:336: note:     def [_S] __add__(self, list[_S], /) -> list[_S | NamedItem]
+ Tools/peg_generator/pegen/grammar_parser.py:336: note: Right operand is of type "list[NamedItem] | None"
+ Tools/peg_generator/pegen/grammar_parser.py:361: error: Argument 2 to "NamedItem" has incompatible type "Leaf | Group | Opt | Repeat | Forced | Lookahead | Rhs | Cut | None"; expected "Leaf | Group | Opt | Repeat | Forced | Lookahead | Rhs | Cut"  [arg-type]
+ Tools/peg_generator/pegen/grammar_parser.py:374: error: Argument 2 to "NamedItem" has incompatible type "Leaf | Group | Opt | Repeat | Forced | Lookahead | Rhs | Cut | None"; expected "Leaf | Group | Opt | Repeat | Forced | Lookahead | Rhs | Cut"  [arg-type]
+ Tools/peg_generator/pegen/grammar_parser.py:408: error: Argument 1 to "Forced" has incompatible type "Leaf | Group | None"; expected "Leaf | Group"  [arg-type]
+ Tools/peg_generator/pegen/grammar_parser.py:425: error: Argument 1 to "PositiveLookahead" has incompatible type "Leaf | Group | None"; expected "Leaf | Group"  [arg-type]
+ Tools/peg_generator/pegen/grammar_parser.py:436: error: Argument 1 to "NegativeLookahead" has incompatible type "Leaf | Group | None"; expected "Leaf | Group"  [arg-type]
+ Tools/peg_generator/pegen/grammar_parser.py:460: error: Argument 1 to "Opt" has incompatible type "Rhs | None"; expected "Leaf | Group | Opt | Repeat | Forced | Lookahead | Rhs | Cut"  [arg-type]
+ Tools/peg_generator/pegen/grammar_parser.py:493: error: Argument 2 to "Gather" has incompatible type "Leaf | Group | None"; expected "Leaf | Group"  [arg-type]
+ Tools/peg_generator/pegen/grammar_parser.py:516: error: Argument 1 to "Group" has incompatible type "Rhs | None"; expected "Rhs"  [arg-type]
+ Tools/peg_generator/pegen/grammar_parser.py:578: error: Unsupported operand types for + ("str" and "None")  [operator]
+ Tools/peg_generator/pegen/grammar_parser.py:578: note: Right operand is of type "str | None"
+ Tools/peg_generator/pegen/grammar_parser.py:671: error: Item "None" of "TokenInfo | None" has no attribute "string"  [union-attr]

egglog-python (https://github.com/egraphs-good/egglog-python)
+ python/egglog/conversion.py:165: error: Value of type "tuple[int, Callable[[Any], RuntimeExpr]] | None" is not indexable  [index]
+ python/egglog/conversion.py:167: error: Value of type "tuple[int, Callable[[Any], RuntimeExpr]] | None" is not indexable  [index]

poetry (https://github.com/python-poetry/poetry)
+ src/poetry/puzzle/transaction.py:155: error: Item "None" of "Any | None" has no attribute "name"  [union-attr]
+ src/poetry/puzzle/transaction.py:156: error: Item "None" of "Any | None" has no attribute "name"  [union-attr]
+ src/poetry/utils/env/python/manager.py:290: error: Item "None" of "Python | None" has no attribute "executable"  [union-attr]
+ src/poetry/utils/env/python/manager.py:292: error: Incompatible return value type (got "Python | None", expected "Python")  [return-value]
+ src/poetry/repositories/http_repository.py:181: error: Argument 2 to "getattr" has incompatible type "str | None"; expected "str"  [arg-type]
+ src/poetry/publishing/uploader.py:352: error: Item "None" of "IO[bytes] | None" has no attribute "read"  [union-attr]

scipy-stubs (https://github.com/scipy/scipy-stubs)
+ scripts/scipy_usage.py:385: error: Argument 1 to "add" of "set" has incompatible type "str | None"; expected "str"  [arg-type]

yarl (https://github.com/aio-libs/yarl)
+ yarl/_url.py:1590:33: error: Item "None" of "Match[str] | None" has no attribute "group"  [union-attr]
+ yarl/_url.py:1590:33: note: See https://mypy.rtfd.io/en/stable/_refs.html#code-union-attr for more info
+ yarl/_url.py:1590:50: error: Item "None" of "Match[str] | None" has no attribute "start"  [union-attr]

rotki (https://github.com/rotki/rotki)
+ rotkehlchen/externalapis/helius.py:260: error: Argument 1 to "deserialize_solana_address" has incompatible type "Any | None"; expected "str"  [arg-type]
+ rotkehlchen/chain/ethereum/modules/eth2/eth2.py:263: error: Value of type "dict[str, dict[Any, Any]] | None" is not indexable  [index]
+ rotkehlchen/chain/ethereum/modules/eth2/eth2.py:264: error: Value of type "dict[str, dict[Any, Any]] | None" is not indexable  [index]
+ rotkehlchen/chain/ethereum/modules/eth2/eth2.py:266: error: Value of type "dict[str, dict[Any, Any]] | None" is not indexable  [index]

xarray (https://github.com/pydata/xarray)
+ xarray/backends/netCDF4_.py: note: In member "prepare_variable" of class "NetCDF4DataStore":
+ xarray/backends/netCDF4_.py:642: error: Argument 4 to "_build_and_get_enum" has incompatible type "Any | None"; expected "str"  [arg-type]
+ xarray/backends/netCDF4_.py:642: error: Argument 5 to "_build_and_get_enum" has incompatible type "Any | None"; expected "dict[str, int]"  [arg-type]

freqtrade (https://github.com/freqtrade/freqtrade)
+ freqtrade/resolvers/iresolver.py:71: error: Argument 1 to "Path" has incompatible type "Any | None"; expected "str | PathLike[str]"  [arg-type]
+ freqtrade/rpc/telegram.py:537: error: Argument 3 to "convert_amount" of "CryptoToFiatConverter" has incompatible type "str | None"; expected "str"  [arg-type]

openlibrary (https://github.com/internetarchive/openlibrary)
+ openlibrary/solr/query_utils.py: note: In function "luqum_parser":
+ openlibrary/solr/query_utils.py:192: error: "None" object is not iterable  [misc]
+ openlibrary/plugins/books/dynlinks.py: note: In function "add_availability":
+ openlibrary/plugins/books/dynlinks.py:458: error: Argument 1 to "get" of "dict" has incompatible type "Literal['no_ebook', 'unclassified', 'printdisabled', 'borrowable', 'public'] | None"; expected "Literal['no_ebook', 'unclassified', 'printdisabled', 'borrowable', 'public']"  [arg-type]

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Walrus narrowing not propagated from inside expression

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@traveltamers