Remove remaining type comments in favour of PEP 526 annotations (#13454)

Author: AlexWaygood

misc/incremental_checker.py

@@ -44,7 +44,7 @@
 import textwrap
 import time
 from argparse import ArgumentParser, Namespace, RawDescriptionHelpFormatter
-from typing import Any, Dict, Tuple
+from typing import Any, Dict
 from typing_extensions import Final, TypeAlias as _TypeAlias
 
 CACHE_PATH: Final = ".incremental_checker_cache.json"
@@ -70,7 +70,7 @@ def execute(command: list[str], fail_on_error: bool = True) -> tuple[str, str, i
     proc = subprocess.Popen(
         " ".join(command), stderr=subprocess.PIPE, stdout=subprocess.PIPE, shell=True
     )
-    stdout_bytes, stderr_bytes = proc.communicate()  # type: Tuple[bytes, bytes]
+    stdout_bytes, stderr_bytes = proc.communicate()
     stdout, stderr = stdout_bytes.decode("utf-8"), stderr_bytes.decode("utf-8")
     if fail_on_error and proc.returncode != 0:
         print("EXECUTED COMMAND:", repr(command))

misc/perf_checker.py

@@ -8,7 +8,7 @@
 import subprocess
 import textwrap
 import time
-from typing import Callable, Tuple
+from typing import Callable
 
 
 class Command:
@@ -32,7 +32,7 @@ def execute(command: list[str]) -> None:
     proc = subprocess.Popen(
         " ".join(command), stderr=subprocess.PIPE, stdout=subprocess.PIPE, shell=True
     )
-    stdout_bytes, stderr_bytes = proc.communicate()  # type: Tuple[bytes, bytes]
+    stdout_bytes, stderr_bytes = proc.communicate()
     stdout, stderr = stdout_bytes.decode("utf-8"), stderr_bytes.decode("utf-8")
     if proc.returncode != 0:
         print("EXECUTED COMMAND:", repr(command))

misc/touch_checker.py

@@ -10,7 +10,7 @@
 import sys
 import textwrap
 import time
-from typing import Callable, Tuple
+from typing import Callable
 
 
 def print_offset(text: str, indent_length: int = 4) -> None:
@@ -28,7 +28,7 @@ def execute(command: list[str]) -> None:
     proc = subprocess.Popen(
         " ".join(command), stderr=subprocess.PIPE, stdout=subprocess.PIPE, shell=True
     )
-    stdout_bytes, stderr_bytes = proc.communicate()  # type: Tuple[bytes, bytes]
+    stdout_bytes, stderr_bytes = proc.communicate()
     stdout, stderr = stdout_bytes.decode("utf-8"), stderr_bytes.decode("utf-8")
     if proc.returncode != 0:
         print("EXECUTED COMMAND:", repr(command))

mypy/build.py

@@ -35,7 +35,6 @@
     Mapping,
     NamedTuple,
     NoReturn,
-    Optional,
     Sequence,
     TextIO,
     TypeVar,
@@ -2490,7 +2489,8 @@ def verify_dependencies(self, suppressed_only: bool = False) -> None:
             line = self.dep_line_map.get(dep, 1)
             try:
                 if dep in self.ancestors:
-                    state, ancestor = None, self  # type: (Optional[State], Optional[State])
+                    state: State | None = None
+                    ancestor: State | None = self
                 else:
                     state, ancestor = self, None
                 # Called just for its side effects of producing diagnostics.

mypy/checkexpr.py

@@ -3370,7 +3370,8 @@ def check_boolean_op(self, e: OpExpr, context: Context) -> Type:
         assert e.op in ("and", "or")  # Checked by visit_op_expr
 
         if e.right_always:
-            left_map, right_map = None, {}  # type: mypy.checker.TypeMap, mypy.checker.TypeMap
+            left_map: mypy.checker.TypeMap = None
+            right_map: mypy.checker.TypeMap = {}
         elif e.right_unreachable:
             left_map, right_map = {}, None
         elif e.op == "and":

mypy/semanal.py

@@ -51,7 +51,7 @@
 from __future__ import annotations
 
 from contextlib import contextmanager
-from typing import Any, Callable, Iterable, Iterator, List, Optional, Set, TypeVar, cast
+from typing import Any, Callable, Iterable, Iterator, List, TypeVar, cast
 from typing_extensions import Final, TypeAlias as _TypeAlias
 
 from mypy import errorcodes as codes, message_registry
@@ -1215,8 +1215,9 @@ def analyze_function_body(self, defn: FuncItem) -> None:
             self.function_stack.pop()
 
     def check_classvar_in_signature(self, typ: ProperType) -> None:
+        t: ProperType
         if isinstance(typ, Overloaded):
-            for t in typ.items:  # type: ProperType
+            for t in typ.items:
                 self.check_classvar_in_signature(t)
             return
         if not isinstance(typ, CallableType):
@@ -1463,7 +1464,8 @@ def analyze_namedtuple_classdef(
         ):
             # Don't reprocess everything. We just need to process methods defined
             # in the named tuple class body.
-            is_named_tuple, info = True, defn.info  # type: bool, Optional[TypeInfo]
+            is_named_tuple = True
+            info: TypeInfo | None = defn.info
         else:
             is_named_tuple, info = self.named_tuple_analyzer.analyze_namedtuple_classdef(
                 defn, self.is_stub_file, self.is_func_scope()
@@ -3149,11 +3151,9 @@ def check_and_set_up_type_alias(self, s: AssignmentStmt) -> bool:
         res: Type | None = None
         if self.is_none_alias(rvalue):
             res = NoneType()
-            alias_tvars, depends_on, qualified_tvars = (
-                [],
-                set(),
-                [],
-            )  # type: List[str], Set[str], List[str]
+            alias_tvars: list[str] = []
+            depends_on: set[str] = set()
+            qualified_tvars: list[str] = []
         else:
             tag = self.track_incomplete_refs()
             res, alias_tvars, depends_on, qualified_tvars = self.analyze_alias(

mypy/stubgen.py

@@ -48,7 +48,7 @@
 import sys
 import traceback
 from collections import defaultdict
-from typing import Dict, Iterable, List, Mapping, Optional, cast
+from typing import Iterable, List, Mapping, cast
 from typing_extensions import Final
 
 import mypy.build
@@ -1652,7 +1652,8 @@ def generate_stubs(options: Options) -> None:
     py_modules, c_modules = collect_build_targets(options, mypy_opts)
 
     # Collect info from docs (if given):
-    sigs = class_sigs = None  # type: Optional[Dict[str, str]]
+    sigs: dict[str, str] | None = None
+    class_sigs = sigs
     if options.doc_dir:
         sigs, class_sigs = collect_docs_signatures(options.doc_dir)