Modernize a few Counter/DefaultDict annotations (#13463)

mypy/nodes.py

@@ -10,7 +10,6 @@
     TYPE_CHECKING,
     Any,
     Callable,
-    DefaultDict,
     Dict,
     Iterator,
     Optional,
@@ -306,7 +305,7 @@ class MypyFile(SymbolNode):
     # Top-level definitions and statements
     defs: list[Statement]
     # Type alias dependencies as mapping from target to set of alias full names
-    alias_deps: DefaultDict[str, set[str]]
+    alias_deps: defaultdict[str, set[str]]
     # Is there a UTF-8 BOM at the start?
     is_bom: bool
     names: SymbolTable

mypy/report.py

@@ -10,7 +10,6 @@
 import sys
 import time
 import tokenize
-import typing
 from abc import ABCMeta, abstractmethod
 from operator import attrgetter
 from typing import Any, Callable, Dict, Iterator, Tuple, cast
@@ -211,7 +210,7 @@ class AnyExpressionsReporter(AbstractReporter):
     def __init__(self, reports: Reports, output_dir: str) -> None:
         super().__init__(reports, output_dir)
         self.counts: dict[str, tuple[int, int]] = {}
-        self.any_types_counter: dict[str, typing.Counter[int]] = {}
+        self.any_types_counter: dict[str, collections.Counter[int]] = {}
 
     def on_file(
         self,
@@ -286,7 +285,7 @@ def _report_any_exprs(self) -> None:
         self._write_out_report("any-exprs.txt", column_names, rows, total_row)
 
     def _report_types_of_anys(self) -> None:
-        total_counter: typing.Counter[int] = collections.Counter()
+        total_counter: collections.Counter[int] = collections.Counter()
         for counter in self.any_types_counter.values():
             for any_type, value in counter.items():
                 total_counter[any_type] += value
@@ -528,7 +527,7 @@ def on_file(
     def _get_any_info_for_line(visitor: stats.StatisticsVisitor, lineno: int) -> str:
         if lineno in visitor.any_line_map:
             result = "Any Types on this line: "
-            counter: typing.Counter[int] = collections.Counter()
+            counter: collections.Counter[int] = collections.Counter()
             for typ in visitor.any_line_map[lineno]:
                 counter[typ.type_of_any] += 1
             for any_type, occurrences in counter.items():

mypy/server/deps.py

@@ -81,7 +81,8 @@ class 'mod.Cls'. This can also refer to an attribute inherited from a
 
 from __future__ import annotations
 
-from typing import DefaultDict, List
+from collections import defaultdict
+from typing import List
 
 from mypy.nodes import (
     GDEF,
@@ -220,7 +221,7 @@ def __init__(
         self,
         type_map: dict[Expression, Type],
         python_version: tuple[int, int],
-        alias_deps: DefaultDict[str, set[str]],
+        alias_deps: defaultdict[str, set[str]],
         options: Options | None = None,
     ) -> None:
         self.scope = Scope()

mypy/stats.py

@@ -3,7 +3,6 @@
 from __future__ import annotations
 
 import os
-import typing
 from collections import Counter
 from contextlib import contextmanager
 from typing import Iterator, cast
@@ -102,7 +101,7 @@ def __init__(
 
         self.line_map: dict[int, int] = {}
 
-        self.type_of_any_counter: typing.Counter[int] = Counter()
+        self.type_of_any_counter: Counter[int] = Counter()
         self.any_line_map: dict[int, list[AnyType]] = {}
 
         # For each scope (top level/function), whether the scope was type checked

mypy/test/testdeps.py

@@ -4,7 +4,6 @@
 
 import os
 from collections import defaultdict
-from typing import DefaultDict
 
 from mypy import build
 from mypy.errors import CompileError
@@ -40,7 +39,7 @@ def run_case(self, testcase: DataDrivenTestCase) -> None:
             if not a:
                 a = ["Unknown compile error (likely syntax error in test case or fixture)"]
         else:
-            deps: DefaultDict[str, set[str]] = defaultdict(set)
+            deps: defaultdict[str, set[str]] = defaultdict(set)
             for module in files:
                 if (
                     module in dumped_modules

mypyc/irbuild/function.py

@@ -13,7 +13,7 @@
 from __future__ import annotations
 
 from collections import defaultdict
-from typing import DefaultDict, NamedTuple, Sequence
+from typing import NamedTuple, Sequence
 
 from mypy.nodes import (
     ArgKind,
@@ -933,7 +933,7 @@ def maybe_insert_into_registry_dict(builder: IRBuilder, fitem: FuncDef) -> None:
     line = fitem.line
     is_singledispatch_main_func = fitem in builder.singledispatch_impls
     # dict of singledispatch_func to list of register_types (fitem is the function to register)
-    to_register: DefaultDict[FuncDef, list[TypeInfo]] = defaultdict(list)
+    to_register: defaultdict[FuncDef, list[TypeInfo]] = defaultdict(list)
     for main_func, impls in builder.singledispatch_impls.items():
         for dispatch_type, impl in impls:
             if fitem == impl:

mypyc/irbuild/prepare.py

@@ -14,7 +14,7 @@
 from __future__ import annotations
 
 from collections import defaultdict
-from typing import DefaultDict, Iterable, NamedTuple, Tuple
+from typing import Iterable, NamedTuple, Tuple
 
 from mypy.build import Graph
 from mypy.nodes import (
@@ -379,7 +379,7 @@ def __init__(self, errors: Errors) -> None:
         super().__init__()
 
         # Map of main singledispatch function to list of registered implementations
-        self.singledispatch_impls: DefaultDict[FuncDef, list[RegisterImplInfo]] = defaultdict(list)
+        self.singledispatch_impls: defaultdict[FuncDef, list[RegisterImplInfo]] = defaultdict(list)
 
         # Map of decorated function to the indices of any decorators to remove
         self.decorators_to_remove: dict[FuncDef, list[int]] = {}