Update semantic analyzer for TypeVar defaults (PEP 696) #14873
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May 29, 2023
Start implementing [PEP 696](https://peps.python.org/pep-0696/) TypeVar defaults. This PR * Adds a `default` parameter to `TypeVarLikeExpr` and `TypeVarLikeType`. * Updates most visitors to account for the new `default` parameter. * Update existing calls to add value for `default` => `AnyType(TypeOfAny.from_omitted_generics)`. A followup PR will update the semantic analyzer and add basic tests for `TypeVar`, `ParamSpec`, and `TypeVarTuple` calls with a `default` argument. -> #14873 Ref #14851
mypy/semanal.py
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| param_value, | ||
| ) | ||
| # Note: we do not return 'None' here -- we want to continue | ||
| # using the AnyType as the upper bound. |
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| # using the AnyType as the upper bound. | |
| # using the AnyType. |
Or the default
mypy/semanal.py
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| self.fail("Only the first argument to ParamSpec has defined semantics", s) | ||
| n_values = call.arg_kinds[1:].count(ARG_POS) | ||
| if n_values != 0: | ||
| self.fail("Only the first positional argument to ParamSpec has defined semantics", s) |
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It actually only takes one positional arg, the rest are keyword-only. So this error message seems imprecise; I think we can just say "Too many positional arguments to ParamSpec()"
mypy/semanal.py
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| default = AnyType(TypeOfAny.from_error) | ||
| else: | ||
| self.fail( | ||
| "The variance and bound arguments to TypeVarTuple do not have defined semantics yet", |
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And in fact they do not exist at runtime
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Rebased to fix the tests. The merge created two duplicate lines which caused the failures. Will take a look at the comments tomorrow. |
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@cdce8p if you're happy with this PR now, feel free to take it out of draft and I'll review it. Maybe we should put this behind an |
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The PR itself is fine. I'm just checking the primer output one more time to make sure but so far I looks as expected. The important thing to note is that these changes don't impact projects which haven't started using PEP 696 yet. For Will post a more detailed update regarding the primer output shortly. As for |
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Primer analysis
- discord/_types.py:32: error: Unexpected argument to "TypeVar()": "default" [misc]
- discord/_types.py:32: error: Unexpected keyword argument "default" for "TypeVar" [call-arg]
- discord/state.py:1617: error: "ConnectionState" expects no type arguments, but 1 given [type-arg]
- discord/state.py:163: error: Free type variable expected in Generic[...] [misc]
- discord/state.py:166: error: Variable "discord._types.ClientT" is not valid as a type [valid-type]
- discord/state.py:166: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- discord/state.py:166: error: Variable "discord._types.ClientT" is not valid as a type [valid-type]
- discord/state.py:166: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- discord/app_commands/tree.py:128: error: ClientT? has no attribute "http" [attr-defined]
- discord/interactions.py:255: error: Incompatible return value type (got "ConnectionState | Guild | None", expected "Guild | None") [return-value]
+ discord/interactions.py:255: error: Incompatible return value type (got "ConnectionState[ClientT] | Guild | None", expected "Guild | None") [return-value]
+ steam/id.py:576: error: Need type annotation for "id" [var-annotated]
+ steam/app.py:94: error: Incompatible default for argument "name" (default has type "None", argument has type "NameT") [assignment]Overall the result looks as expected and should improve further once the |
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Diff from mypy_primer, showing the effect of this PR on open source code: steam.py (https://github.com/Gobot1234/steam.py)
- steam/types/user.py:137: error: Unexpected argument to "TypeVar()": "default" [misc]
- steam/types/user.py:139: error: Unexpected argument to "TypeVar()": "default" [misc]
- steam/types/user.py:142: error: "ID" expects no type arguments, but 1 given [type-arg]
- steam/id.py:223: error: Unexpected argument to "TypeVar()": "default" [misc]
- steam/id.py:226: error: Free type variable expected in Generic[...] [misc]
- steam/id.py:294: error: Variable "steam.id.TypeT" is not valid as a type [valid-type]
- steam/id.py:294: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- steam/id.py:331: error: Variable "steam.id.TypeT" is not valid as a type [valid-type]
- steam/id.py:331: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- steam/id.py:333: error: Variable "steam.id.TypeT" is not valid as a type [valid-type]
- steam/id.py:333: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- steam/id.py:546: error: "ID" expects no type arguments, but 1 given [type-arg]
- steam/id.py:567: error: "ID" expects no type arguments, but 1 given [type-arg]
- steam/id.py:581: error: The type "type[ID]" is not generic and not indexable [misc]
+ steam/id.py:576: error: Need type annotation for "id" [var-annotated]
+ steam/id.py:581: error: Parameter 1 of Literal[...] is invalid [valid-type]
+ steam/badge.py:123: error: Argument 1 to "inventory" of "PartialUser" has incompatible type "tuple[str, int, int]"; expected "App[Any]" [arg-type]
+ steam/badge.py:185: error: Argument 4 to "__init__" of "BaseOwnedBadge" has incompatible type "object"; expected "PartialApp[Any]" [arg-type]
+ steam/app.py:94: error: Incompatible default for argument "name" (default has type "None", argument has type "NameT") [assignment]
+ steam/app.py:94: note: PEP 484 prohibits implicit Optional. Accordingly, mypy has changed its default to no_implicit_optional=True
+ steam/app.py:94: note: Use https://github.com/hauntsaninja/no_implicit_optional to automatically upgrade your codebase
+ steam/app.py:116: error: Incompatible return value type (got "NameT | str", expected "str") [return-value]
+ steam/app.py:129: error: Argument "game_extra_info" to "CMsgClientGamesPlayedGamePlayed" has incompatible type "NameT"; expected "str" [arg-type]
+ steam/app.py:195: error: Need type annotation for "app" [var-annotated]
+ steam/app.py:207: error: Need type annotation for "licenses" [var-annotated]
- steam/role.py:64: error: MemberT? has no attribute "roles" [attr-defined]
- steam/badge.py:29: error: Unexpected argument to "TypeVar()": "default" [misc]
- steam/badge.py:40: error: Variable "steam.badge.AppT" is not valid as a type [valid-type]
- steam/badge.py:40: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- steam/badge.py:43: error: Variable "steam.badge.AppT" is not valid as a type [valid-type]
- steam/badge.py:43: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- steam/badge.py:56: error: Unsupported left operand type for == (AppT?) [operator]
- steam/badge.py:66: error: AppT? has no attribute "badges" [attr-defined]
- steam/badge.py:73: error: AppT? has no attribute "badges" [attr-defined]
- steam/badge.py:79: error: "BaseBadge" expects no type arguments, but 1 given [type-arg]
- steam/badge.py:79: error: Variable "steam.badge.AppT" is not valid as a type [valid-type]
- steam/badge.py:79: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- steam/badge.py:84: error: Variable "steam.badge.AppT" is not valid as a type [valid-type]
- steam/badge.py:84: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- steam/badge.py:102: error: Variable "steam.types.user.UserT" is not valid as a type [valid-type]
- steam/badge.py:102: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- steam/badge.py:111: error: Variable "steam.badge.AppT" is not valid as a type [valid-type]
- steam/badge.py:111: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- steam/badge.py:111: error: Variable "steam.types.user.UserT" is not valid as a type [valid-type]
- steam/badge.py:117: error: "Item" expects no type arguments, but 1 given [type-arg]
- steam/badge.py:117: error: Variable "steam.types.user.UserT" is not valid as a type [valid-type]
- steam/badge.py:117: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- steam/badge.py:123: error: UserT? has no attribute "inventory" [attr-defined]
- steam/badge.py:129: error: "Item" expects no type arguments, but 1 given [type-arg]
- steam/badge.py:129: error: Variable "steam.types.user.UserT" is not valid as a type [valid-type]
- steam/badge.py:129: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- steam/badge.py:139: error: "Item" expects no type arguments, but 1 given [type-arg]
- steam/badge.py:139: error: Variable "steam.types.user.UserT" is not valid as a type [valid-type]
- steam/badge.py:139: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- steam/badge.py:150: error: "BaseOwnedBadge" expects no type arguments, but 2 given [type-arg]
- steam/badge.py:150: error: Variable "steam.types.user.UserT" is not valid as a type [valid-type]
- steam/badge.py:150: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- steam/badge.py:161: error: Variable "steam.types.user.UserT" is not valid as a type [valid-type]
- steam/badge.py:161: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- steam/badge.py:173: error: "BaseOwnedBadge" expects no type arguments, but 2 given [type-arg]
- steam/badge.py:173: error: Variable "steam.types.user.UserT" is not valid as a type [valid-type]
- steam/badge.py:173: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- steam/badge.py:178: error: Variable "steam.types.user.UserT" is not valid as a type [valid-type]
- steam/badge.py:178: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- steam/badge.py:197: error: "UserBadge" expects no type arguments, but 1 given [type-arg]
- steam/badge.py:197: error: Variable "steam.types.user.UserT" is not valid as a type [valid-type]
- steam/badge.py:197: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- steam/badge.py:228: error: Variable "steam.types.user.UserT" is not valid as a type [valid-type]
- steam/badge.py:228: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- steam/badge.py:238: error: "UserBadge" expects no type arguments, but 1 given [type-arg]
- steam/badge.py:238: error: Variable "steam.types.user.UserT" is not valid as a type [valid-type]
- steam/badge.py:238: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- steam/app.py:77: error: Unexpected argument to "TypeVar()": "default" [misc]
- steam/app.py:81: error: Free type variable expected in Generic[...] [misc]
- steam/app.py:94: error: Variable "steam.app.NameT" is not valid as a type [valid-type]
- steam/app.py:94: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- steam/app.py:143: error: "App" expects no type arguments, but 1 given [type-arg]
+ steam/app.py:438: error: Incompatible default for argument "name" (default has type "None", argument has type "NameT") [assignment]
+ steam/app.py:438: note: PEP 484 prohibits implicit Optional. Accordingly, mypy has changed its default to no_implicit_optional=True
+ steam/app.py:438: note: Use https://github.com/hauntsaninja/no_implicit_optional to automatically upgrade your codebase
- steam/app.py:424: error: "App" expects no type arguments, but 1 given [type-arg]
- steam/app.py:424: error: Variable "steam.app.NameT" is not valid as a type [valid-type]
- steam/app.py:424: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- steam/app.py:438: error: Variable "steam.app.NameT" is not valid as a type [valid-type]
- steam/app.py:438: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- steam/app.py:515: error: "Leaderboard" expects 1 type argument, but 2 given [type-arg]
- steam/app.py:541: error: "Leaderboard" expects 1 type argument, but 2 given [type-arg]
- steam/app.py:567: error: "Leaderboard" expects 1 type argument, but 2 given [type-arg]
- steam/app.py:881: error: Incompatible types in assignment (expression has type "PublishedFile", variable has type "PublishedFileDetails") [assignment]
+ steam/app.py:881: error: Incompatible types in assignment (expression has type "PublishedFile[PartialUser]", variable has type "PublishedFileDetails") [assignment]
- steam/app.py:887: error: UserT? has no attribute "id64" [attr-defined]
- steam/app.py:983: error: "AppBadge" expects no type arguments, but 1 given [type-arg]
- steam/app.py:1002: error: "AppBadge" expects no type arguments, but 1 given [type-arg]
- steam/app.py:1086: error: "PartialApp" expects no type arguments, but 1 given [type-arg]
- steam/app.py:1159: error: "PartialApp" expects no type arguments, but 1 given [type-arg]
- steam/app.py:1205: error: "PartialApp" expects no type arguments, but 1 given [type-arg]
- steam/app.py:1275: error: "PartialApp" expects no type arguments, but 1 given [type-arg]
- steam/app.py:1386: error: "PartialApp" expects no type arguments, but 1 given [type-arg]
+ steam/app.py:1435: error: Need type annotation for "partial_dlc" [var-annotated]
... (truncated 900 lines) ...
discord.py (https://github.com/Rapptz/discord.py)
- discord/_types.py:32: error: Unexpected argument to "TypeVar()": "default" [misc]
- discord/_types.py:32: error: Unexpected keyword argument "default" for "TypeVar" [call-arg]
- note: "TypeVar" defined here
- discord/state.py:163: error: Free type variable expected in Generic[...] [misc]
- discord/state.py:166: error: Variable "discord._types.ClientT" is not valid as a type [valid-type]
- discord/state.py:166: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- discord/state.py:1617: error: "ConnectionState" expects no type arguments, but 1 given [type-arg]
- discord/state.py:1617: error: Variable "discord._types.ClientT" is not valid as a type [valid-type]
- discord/state.py:1617: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- discord/message.py:532: error: Incompatible return value type (got "ConnectionState | Message | None", expected "Message | None") [return-value]
+ discord/message.py:532: error: Incompatible return value type (got "ConnectionState[Any] | Message | None", expected "Message | None") [return-value]
- discord/interactions.py:93: error: Free type variable expected in Generic[...] [misc]
- discord/interactions.py:167: error: "ConnectionState" expects no type arguments, but 1 given [type-arg]
- discord/interactions.py:167: error: Variable "discord._types.ClientT" is not valid as a type [valid-type]
- discord/interactions.py:167: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- discord/interactions.py:168: error: "ConnectionState" expects no type arguments, but 1 given [type-arg]
- discord/interactions.py:168: error: Variable "discord._types.ClientT" is not valid as a type [valid-type]
- discord/interactions.py:168: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- discord/interactions.py:169: error: Variable "discord._types.ClientT" is not valid as a type [valid-type]
- discord/interactions.py:169: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- discord/interactions.py:182: error: Incompatible types in assignment (expression has type "object", variable has type "ApplicationCommandInteractionData | MessageComponentInteractionData | ModalSubmitInteractionData | None") [assignment]
+ discord/interactions.py:182: error: Incompatible types in assignment (expression has type "object", variable has type "ChatInputApplicationCommandInteractionData | UserApplicationCommandInteractionData | MessageApplicationCommandInteractionData | ButtonMessageComponentInteractionData | SelectMessageComponentInteractionData | ModalSubmitInteractionData | None") [assignment]
- discord/interactions.py:244: error: Variable "discord._types.ClientT" is not valid as a type [valid-type]
- discord/interactions.py:244: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- discord/interactions.py:255: error: Incompatible return value type (got "ConnectionState | Guild | None", expected "Guild | None") [return-value]
+ discord/interactions.py:255: error: Incompatible return value type (got "ConnectionState[ClientT] | Guild | None", expected "Guild | None") [return-value]
- discord/interactions.py:328: error: "InteractionResponse" expects no type arguments, but 1 given [type-arg]
- discord/interactions.py:328: error: Variable "discord._types.ClientT" is not valid as a type [valid-type]
- discord/interactions.py:328: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- discord/interactions.py:574: error: Free type variable expected in Generic[...] [misc]
- discord/interactions.py:587: error: "Interaction" expects no type arguments, but 1 given [type-arg]
- discord/interactions.py:587: error: Variable "discord._types.ClientT" is not valid as a type [valid-type]
- discord/interactions.py:587: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- discord/interactions.py:588: error: "Interaction" expects no type arguments, but 1 given [type-arg]
- discord/interactions.py:588: error: Variable "discord._types.ClientT" is not valid as a type [valid-type]
- discord/interactions.py:588: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- discord/interactions.py:1071: error: Incompatible types in assignment (expression has type "_InteractionMessageState", base class "Message" defined the type as "ConnectionState") [assignment]
+ discord/interactions.py:1071: error: Incompatible types in assignment (expression has type "_InteractionMessageState", base class "Message" defined the type as "ConnectionState[Any]") [assignment]
- discord/client.py:285: error: "ConnectionState" expects no type arguments, but 1 given [type-arg]
+ discord/client.py:291: error: Incompatible types in assignment (expression has type "Callable[[], Client]", variable has type "Callable[..., Self]") [assignment]
+ discord/client.py:291: error: Incompatible return value type (got "Client", expected "Self") [return-value]
- discord/client.py:1164: error: "Interaction" expects no type arguments, but 1 given [type-arg]
- discord/client.py:1166: error: "Interaction" expects no type arguments, but 1 given [type-arg]
- discord/client.py:1450: error: "Interaction" expects no type arguments, but 1 given [type-arg]
- discord/client.py:1452: error: "Interaction" expects no type arguments, but 1 given [type-arg]
- discord/webhook/sync.py:404: error: Incompatible types in assignment (expression has type "_WebhookState", base class "Message" defined the type as "ConnectionState") [assignment]
+ discord/webhook/sync.py:404: error: Incompatible types in assignment (expression has type "_WebhookState", base class "Message" defined the type as "ConnectionState[Any]") [assignment]
- discord/webhook/async_.py:772: error: Incompatible types in assignment (expression has type "_WebhookState", base class "Message" defined the type as "ConnectionState") [assignment]
+ discord/webhook/async_.py:772: error: Incompatible types in assignment (expression has type "_WebhookState", base class "Message" defined the type as "ConnectionState[Any]") [assignment]
- discord/webhook/async_.py:1011: error: Incompatible return value type (got "ConnectionState | _WebhookState | Guild | None", expected "Guild | None") [return-value]
+ discord/webhook/async_.py:1011: error: Incompatible return value type (got "ConnectionState[Any] | _WebhookState | Guild | None", expected "Guild | None") [return-value]
- discord/ui/view.py:176: error: "Callable[[Any, Interaction, Any], Coroutine[Any, Any, Any]]" has no attribute "__discord_ui_model_type__" [attr-defined]
+ discord/ui/view.py:176: error: "Callable[[Any, Interaction[Any], Any], Coroutine[Any, Any, Any]]" has no attribute "__discord_ui_model_type__" [attr-defined]
- discord/ui/view.py:176: error: "Callable[[Any, Interaction, Any], Coroutine[Any, Any, Any]]" has no attribute "__discord_ui_model_kwargs__" [attr-defined]
+ discord/ui/view.py:176: error: "Callable[[Any, Interaction[Any], Any], Coroutine[Any, Any, Any]]" has no attribute "__discord_ui_model_kwargs__" [attr-defined]
- discord/ui/item.py:45: error: "Interaction" expects no type arguments, but 1 given [type-arg]
- discord/ui/item.py:123: error: "Interaction" expects no type arguments, but 1 given [type-arg]
- discord/ui/item.py:123: error: Variable "discord._types.ClientT" is not valid as a type [valid-type]
- discord/ui/item.py:123: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- discord/app_commands/tree.py:110: error: Free type variable expected in Generic[...] [misc]
- discord/app_commands/tree.py:126: error: Variable "discord._types.ClientT" is not valid as a type [valid-type]
- discord/app_commands/tree.py:126: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- discord/app_commands/tree.py:127: error: Variable "discord._types.ClientT" is not valid as a type [valid-type]
- discord/app_commands/tree.py:127: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- discord/app_commands/tree.py:128: error: ClientT? has no attribute "http" [attr-defined]
- discord/app_commands/tree.py:129: error: ClientT? has no attribute "_connection" [attr-defined]
- discord/app_commands/tree.py:173: error: ClientT? has no attribute "application_id" [attr-defined]
- discord/app_commands/tree.py:177: error: ClientT? has no attribute "application_id" [attr-defined]
- discord/app_commands/tree.py:179: error: ClientT? has no attribute "application_id" [attr-defined]
- discord/app_commands/tree.py:213: error: ClientT? has no attribute "application_id" [attr-defined]
- discord/app_commands/tree.py:217: error: ClientT? has no attribute "application_id" [attr-defined]
- discord/app_commands/tree.py:219: error: ClientT? has no attribute "application_id" [attr-defined]
- discord/app_commands/tree.py:774: error: "Interaction" expects no type arguments, but 1 given [type-arg]
- discord/app_commands/tree.py:774: error: Variable "discord._types.ClientT" is not valid as a type [valid-type]
- discord/app_commands/tree.py:774: note: See https://mypy.readthedocs.io/en/stable/common_issues.html#variables-vs-type-aliases
- discord/app_commands/tree.py:1054: error: ClientT? has no attribute "application_id" [attr-defined]
- discord/app_commands/tree.py:1067: error: ClientT? has no attribute "application_id" [attr-defined]
- discord/app_commands/tree.py:1069: error: ClientT? has no attribute "application_id" [attr-defined]
- discord/app_commands/tree.py:1077: error: "Interaction" expects no type arguments, but 1 given [type-arg]
... (truncated 87 lines) ...
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@JelleZijlstra If you've got some time, I'd love to get this in before the next release. It would allow projects to start using Depending on time, I could even open a followup which would start using the |
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Will take a look tonight |
JelleZijlstra
approved these changes
Jun 6, 2023
| tv_arg = self.get_typevarlike_argument( | ||
| "TypeVar", param_name, param_value, context, allow_unbound_tvars=True | ||
| ) | ||
| default = tv_arg or AnyType(TypeOfAny.from_error) | ||
| elif param_name == "values": | ||
| # Probably using obsolete syntax with values=(...). Explain the current syntax. |
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(Not related to your PR) I wonder when this did work, may have been before typing was in CPython
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This PR updates the semantic analyzer to support most forms of TypeVars with defaults while also providing basic argument validation.
Ref: #14851