Add typing to several checkers

5 files changed, 17 insertions, 16 deletions

diff --git a/pylint/extensions/comparetozero.py b/pylint/extensions/comparetozero.py
index dd0f1949a..8aca300d2 100644
--- a/pylint/extensions/comparetozero.py
+++ b/pylint/extensions/comparetozero.py
@@ -7,8 +7,7 @@
 from __future__ import annotations
 
 import itertools
-from collections.abc import Iterable
-from typing import TYPE_CHECKING, Any
+from typing import TYPE_CHECKING
 
 import astroid
 from astroid import nodes
@@ -20,7 +19,7 @@ if TYPE_CHECKING:
     from pylint.lint import PyLinter
 
 
-def _is_constant_zero(node):
+def _is_constant_zero(node: str | nodes.NodeNG) -> bool:
     return isinstance(node, astroid.Const) and node.value == 0
 
 
@@ -52,15 +51,15 @@ class CompareToZeroChecker(checkers.BaseChecker):
         # while the rest are a list of tuples in node.ops
         # the format of the tuple is ('compare operator sign', node)
         # here we squash everything into `ops` to make it easier for processing later
-        ops = [("", node.left)]
+        ops: list[tuple[str, nodes.NodeNG]] = [("", node.left)]
         ops.extend(node.ops)
-        iter_ops: Iterable[Any] = iter(ops)
-        ops = list(itertools.chain(*iter_ops))
+        iter_ops = iter(ops)
+        all_ops = list(itertools.chain(*iter_ops))
 
-        for ops_idx in range(len(ops) - 2):
-            op_1 = ops[ops_idx]
-            op_2 = ops[ops_idx + 1]
-            op_3 = ops[ops_idx + 2]
+        for ops_idx in range(len(all_ops) - 2):
+            op_1 = all_ops[ops_idx]
+            op_2 = all_ops[ops_idx + 1]
+            op_3 = all_ops[ops_idx + 2]
             error_detected = False
 
             # 0 ?? X
diff --git a/pylint/extensions/comparison_placement.py b/pylint/extensions/comparison_placement.py
index 264b2402d..df7cc9890 100644
--- a/pylint/extensions/comparison_placement.py
+++ b/pylint/extensions/comparison_placement.py
@@ -45,7 +45,7 @@ class MisplacedComparisonConstantChecker(BaseChecker):
         left: nodes.NodeNG,
         right: nodes.NodeNG,
         operator: str,
-    ):
+    ) -> None:
         if isinstance(right, nodes.Const):
             return
         operator = REVERSED_COMPS.get(operator, operator)
diff --git a/pylint/extensions/confusing_elif.py b/pylint/extensions/confusing_elif.py
index 8e70cab60..174f464ac 100644
--- a/pylint/extensions/confusing_elif.py
+++ b/pylint/extensions/confusing_elif.py
@@ -40,7 +40,7 @@ class ConfusingConsecutiveElifChecker(BaseChecker):
             self.add_message("confusing-consecutive-elif", node=node.orelse[0])
 
     @staticmethod
-    def _has_no_else_clause(node: nodes.If):
+    def _has_no_else_clause(node: nodes.If) -> bool:
         orelse = node.orelse
         while orelse and isinstance(orelse[0], nodes.If):
             orelse = orelse[0].orelse
diff --git a/pylint/extensions/docstyle.py b/pylint/extensions/docstyle.py
index 99b01563f..1ca2885e9 100644
--- a/pylint/extensions/docstyle.py
+++ b/pylint/extensions/docstyle.py
@@ -48,7 +48,9 @@ class DocStringStyleChecker(checkers.BaseChecker):
 
     visit_asyncfunctiondef = visit_functiondef
 
-    def _check_docstring(self, node_type, node):
+    def _check_docstring(
+        self, node_type: str, node: nodes.Module | nodes.ClassDef | nodes.FunctionDef
+    ) -> None:
         docstring = node.doc_node.value if node.doc_node else None
         if docstring and docstring[0] == "\n":
             self.add_message(
@@ -73,7 +75,7 @@ class DocStringStyleChecker(checkers.BaseChecker):
             elif line and line[0] == "'":
                 quotes = "'"
             else:
-                quotes = False
+                quotes = ""
             if quotes:
                 self.add_message(
                     "bad-docstring-quotes",
diff --git a/pylint/extensions/empty_comment.py b/pylint/extensions/empty_comment.py
index 70d3f67d2..5b60900c0 100644
--- a/pylint/extensions/empty_comment.py
+++ b/pylint/extensions/empty_comment.py
@@ -14,7 +14,7 @@ if TYPE_CHECKING:
     from pylint.lint import PyLinter
 
 
-def is_line_commented(line):
+def is_line_commented(line: bytes) -> bool:
     """Checks if a `# symbol that is not part of a string was found in line."""
 
     comment_idx = line.find(b"#")
@@ -25,7 +25,7 @@ def is_line_commented(line):
     return True
 
 
-def comment_part_of_string(line, comment_idx):
+def comment_part_of_string(line: bytes, comment_idx: int) -> bool:
     """Checks if the symbol at comment_idx is part of a string."""
 
     if (