David Peter 73107a083c [ty] Type inference for comprehensions (#20962) ... ## Summary Adds type inference for list/dict/set comprehensions, including bidirectional inference: ```py reveal_type({k: v for k, v in [("a", 1), ("b", 2)]}) # dict[Unknown | str, Unknown | int] squares: list[int | None] = [x for x in range(10)] reveal_type(squares) # list[int | None] ``` ## Ecosystem impact I did spot check the changes and most of them seem like known limitations or true positives. Without proper bidirectional inference, we saw a lot of false positives. ## Test Plan New Markdown tests		2025-11-02 14:35:33 +01:00
..
annotations	[ty] Infer type of self for decorated methods and properties (#21123)	2025-10-29 21:22:38 +00:00
assignment	[ty] Prefer declared type for invariant collection literals (#20927)	2025-10-16 16:11:28 -04:00
binary	[ty] Sync vendored typeshed stubs (#20876)	2025-10-15 11:13:32 +02:00
boolean	Revert "[ty] Better control flow for boolean expressions that are inside if (#18010)" (#18150)	2025-05-17 08:27:32 -04:00
boundness_declaredness	[ty] Reformulation of public symbol inference test suite (#20667)	2025-10-01 14:26:17 +02:00
call	[ty] Use declared attribute types as type context (#21143)	2025-10-31 15:48:28 +00:00
class	[ty] Fix bug where ty would think all types had an __mro__ attribute (#20995)	2025-10-27 11:19:12 +00:00
comparison	[ty] detect cycles in binary comparison inference (#20446)	2025-09-17 09:45:25 +02:00
comprehensions	[ty] Type inference for comprehensions (#20962)	2025-11-02 14:35:33 +01:00
conditional	[ty] Support as-patterns in reachability analysis (#19728)	2025-08-04 20:13:50 +02:00
dataclasses	[ty] Fix generic inference for non-dataclass inheriting from generic dataclass (#21159)	2025-10-31 13:55:17 +01:00
declaration	[ty] Format conflicting types as an enumeration (#18956)	2025-06-26 14:29:33 +02:00
diagnostics	[ty] continue and break statements outside loops are syntax errors (#20944)	2025-10-17 17:13:40 +00:00
directives	[ty] Use annotated parameters as type context (#20635)	2025-10-03 17:14:51 -04:00
doc	ty_python_semantic: add union type context to function call type errors	2025-05-09 13:40:51 -04:00
exception	[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)	2025-10-12 18:39:32 +00:00
expression	[ty] Delegate truthiness inference of an enum Literal type to its enum-instance supertype (#21060)	2025-10-24 14:34:16 +01:00
function	[ty] Improve disambiguation of types via fully qualified names (#20141)	2025-08-29 08:44:18 +00:00
generics	[ty] Prefer exact matches when solving constrained type variables (#21165)	2025-10-31 10:58:09 -04:00
ide_support	[ty] Filter out revealed-type and undefined-reveal diagnostics from mdtest snapshots (#20820)	2025-10-12 18:39:32 +00:00
import	Consistently wrap tokens in parser diagnostics in backticks instead of 'quotes' (#21163)	2025-10-31 11:59:11 -04:00
literal	[ty] Type inference for comprehensions (#20962)	2025-11-02 14:35:33 +01:00
loops	[ty] Fix bug where ty would think all types had an __mro__ attribute (#20995)	2025-10-27 11:19:12 +00:00
narrow	[ty] Use the top materialization of classes for narrowing in class-patterns for match statements (#21150)	2025-10-30 20:44:51 +00:00
regression	[ty] Type inference for comprehensions (#20962)	2025-11-02 14:35:33 +01:00
scopes	[ty] Improve error messages for unresolved attribute diagnostics (#20963)	2025-10-19 10:58:25 +01:00
shadowing
snapshots	[ty] don't assume in diagnostic messages that a TypedDict key error is about subscript access (#21166)	2025-10-31 10:49:59 -04:00
stubs	[ty] Fix bug where ty would think all types had an __mro__ attribute (#20995)	2025-10-27 11:19:12 +00:00
subscript	[ty] Fix bug where ty would think all types had an __mro__ attribute (#20995)	2025-10-27 11:19:12 +00:00
suppressions	[ty] Add suggestion to unknown rule diagnostics, rename unknown-rule lint to ignore-comment-unknown-rule (#20948)	2025-10-18 12:44:21 +02:00
type_compendium	[ty] Heterogeneous unpacking support for unions (#20377)	2025-10-15 19:30:03 +01:00
type_of	[ty] Fix bug where ty would think all types had an __mro__ attribute (#20995)	2025-10-27 11:19:12 +00:00
type_properties	[ty] Add and test when constraint sets are satisfied by their typevars (#21129)	2025-10-31 10:53:37 -04:00
type_qualifiers	[ty] Fix bug where ty would think all types had an __mro__ attribute (#20995)	2025-10-27 11:19:12 +00:00
unary	Update class literal display to use <class 'Foo'> style (#17889)	2025-05-06 20:11:25 -04:00
with	[ty] Use typing.Self for the first parameter of instance methods (#20517)	2025-09-29 21:08:08 +02:00
.mdformat.toml
async.md	[ty] Support async/await, async with and yield from (#19595)	2025-07-30 11:51:21 +02:00
attributes.md	[ty] Use range instead of custom IntIterable (#21138)	2025-10-30 15:21:55 +01:00
bidirectional.md	[ty] Support type context of union attribute assignments (#21170)	2025-10-31 12:41:14 -04:00
classes.md	[ty] Fix bug where ty would think all types had an __mro__ attribute (#20995)	2025-10-27 11:19:12 +00:00
cycle.md	[ty] Avoid ever-growing default types (#20991)	2025-10-21 19:13:36 +02:00
decorators.md	ty_python_semantic: add union type context to function call type errors	2025-05-09 13:40:51 -04:00
del.md	[ty] No union with Unknown for module-global symbols (#20664)	2025-10-01 16:40:30 +02:00
deprecated.md	[ty] Consistent use of American english (in rules) (#19488)	2025-07-22 16:10:38 +02:00
descriptor_protocol.md	[ty] Infer type for implicit self parameters in method bodies (#20922)	2025-10-23 09:34:39 +02:00
enums.md	[ty] Enums: allow multiple aliases to point to the same member (#20669)	2025-10-01 15:51:53 +02:00
exhaustiveness_checking.md	[ty] Improve exhaustiveness analysis for type variables with bounds or constraints (#21172)	2025-10-31 16:51:11 -04:00
final.md
implicit_type_aliases.md	[ty] no more diverging query cycles in type expressions (#20359)	2025-09-16 16:44:11 -07:00
instance_layout_conflict.md	[ty] initial support for slots=True in dataclasses (#20278)	2025-09-07 18:25:35 +01:00
intersection_types.md	[ty] Expansion of enums into unions of literals (#19382)	2025-07-21 19:37:55 +02:00
invalid_syntax.md
known_constants.md
literal_promotion.md	[ty] Do not promote literals in contravariant positions of generic specializations (#21171)	2025-10-31 17:48:34 +01:00
mdtest_config.md
mdtest_custom_typeshed.md	[ty] Remove Type::Tuple (#19669)	2025-08-11 22:03:32 +01:00
metaclass.md	Update class literal display to use <class 'Foo'> style (#17889)	2025-05-06 20:11:25 -04:00
mro.md	[ty] Fix bug where ty would think all types had an __mro__ attribute (#20995)	2025-10-27 11:19:12 +00:00
named_tuple.md	[ty] Fix bug where ty would think all types had an __mro__ attribute (#20995)	2025-10-27 11:19:12 +00:00
overloads.md	[ty] Infer type of self for decorated methods and properties (#21123)	2025-10-29 21:22:38 +00:00
pep613_type_aliases.md	[ty] Fall back to Divergent for deeply nested specializations (#20988)	2025-10-22 14:29:10 +02:00
pep695_type_aliases.md	[ty] Add cycle handling to lazy_default (#20967)	2025-10-23 10:05:08 +02:00
properties.md	[ty] "foo".startswith is not an instance of types.MethodWrapperType (#20317)	2025-09-10 11:14:26 +00:00
protocols.md	[ty] Fix bug where ty would think all types had an __mro__ attribute (#20995)	2025-10-27 11:19:12 +00:00
public_types.md	[ty] Disambiguate classes that live in different modules but have the same fully qualified names (#20756)	2025-10-08 18:27:40 +01:00
statically_known_branches.md	[ty] Rename "possibly unbound" diagnostics to "possibly missing" (#20492)	2025-09-23 14:26:55 +00:00
sys_platform.md
sys_version_info.md
t_strings.md	[ty] Add support for PEP 750 t-strings (#20085)	2025-08-25 18:49:49 +00:00
terminal_statements.md	[ty] improve lazy scope place lookup (#19321)	2025-07-25 07:11:11 +00:00
ty_extensions.md	[ty] Fix bug where ty would think all types had an __mro__ attribute (#20995)	2025-10-27 11:19:12 +00:00
typed_dict.md	[ty] rollback preferring declared type on invalid TypedDict creation (#21169)	2025-10-31 12:06:47 -04:00
union_types.md	[ty] Introduce TypeRelation::Redundancy (#20602)	2025-10-03 18:35:30 +01:00
unpacking.md	[ty] Infer more precise types for collection literals (#20360)	2025-09-17 18:51:50 -04:00
unreachable.md	[ty] Rename "possibly unbound" diagnostics to "possibly missing" (#20492)	2025-09-23 14:26:55 +00:00