Remove unused constants (#2141)

* Remove `PY38_PLUS` constant
* Remove `BUILTINS` constants
* Remove `Load` + `Store` + `Del`
* Remove `BOOL_SPECIAL_METHOD`

ChangeLog

@@ -88,6 +88,17 @@ Release date: TBA
 
   Refs #1490
 
+* Remove unused and / or deprecated constants:
+  - ``astroid.bases.BOOL_SPECIAL_METHOD``
+  - ``astroid.bases.BUILTINS``
+  - ``astroid.const.BUILTINS``
+  - ``astroid.const.PY38_PLUS``
+  - ``astroid.const.Load``
+  - ``astroid.const.Store``
+  - ``astroid.const.Del``
+
+  Refs #2141
+
 
 What's New in astroid 2.15.4?
 =============================

astroid/__init__.py

@@ -46,7 +46,7 @@
 from astroid.bases import BaseInstance, BoundMethod, Instance, UnboundMethod
 from astroid.brain.helpers import register_module_extender
 from astroid.builder import extract_node, parse
-from astroid.const import BRAIN_MODULES_DIRECTORY, PY310_PLUS, Context, Del, Load, Store
+from astroid.const import BRAIN_MODULES_DIRECTORY, PY310_PLUS, Context
 from astroid.exceptions import (
     AstroidBuildingError,
     AstroidBuildingException,

astroid/bases.py

@@ -39,10 +39,6 @@
     from astroid.constraint import Constraint
 
 
-# TODO: check if needs special treatment
-BOOL_SPECIAL_METHOD = "__bool__"
-BUILTINS = "builtins"  # TODO Remove in 2.8
-
 PROPERTIES = {"builtins.property", "abc.abstractproperty"}
 if PY310_PLUS:
     PROPERTIES.add("enum.property")
@@ -383,7 +379,7 @@ def bool_value(
         context.boundnode = self
 
         try:
-            result = _infer_method_result_truth(self, BOOL_SPECIAL_METHOD, context)
+            result = _infer_method_result_truth(self, "__bool__", context)
         except (InferenceError, AttributeInferenceError):
             # Fallback to __len__.
             try:

astroid/brain/brain_ssl.py

@@ -6,7 +6,7 @@
 
 from astroid import parse
 from astroid.brain.helpers import register_module_extender
-from astroid.const import PY38_PLUS, PY310_PLUS
+from astroid.const import PY310_PLUS
 from astroid.manager import AstroidManager
 
 
@@ -41,9 +41,7 @@ class Options(_IntFlag):
         OP_SINGLE_ECDH_USE = 10
         OP_NO_COMPRESSION = 11
         OP_NO_TICKET = 12
-        OP_NO_RENEGOTIATION = 13"""
-    if PY38_PLUS:
-        enum += """
+        OP_NO_RENEGOTIATION = 13
         OP_ENABLE_MIDDLEBOX_COMPAT = 14"""
     return enum
 

astroid/brain/brain_typing.py

@@ -13,7 +13,7 @@
 
 from astroid import context, extract_node, inference_tip
 from astroid.builder import _extract_single_node
-from astroid.const import PY38_PLUS, PY39_PLUS
+from astroid.const import PY39_PLUS
 from astroid.exceptions import (
     AttributeInferenceError,
     InferenceError,
@@ -428,7 +428,7 @@ def infer_typing_cast(
     AstroidManager().register_transform(
         FunctionDef, inference_tip(infer_typedDict), _looks_like_typedDict
     )
-elif PY38_PLUS:
+else:
     AstroidManager().register_transform(
         ClassDef, inference_tip(infer_old_typedDict), _looks_like_typedDict
     )

astroid/brain/brain_unittest.py

@@ -5,7 +5,6 @@
 """Astroid hooks for unittest module."""
 from astroid.brain.helpers import register_module_extender
 from astroid.builder import parse
-from astroid.const import PY38_PLUS
 from astroid.manager import AstroidManager
 
 
@@ -27,7 +26,4 @@ def IsolatedAsyncioTestCaseImport():
     )
 
 
-if PY38_PLUS:
-    register_module_extender(
-        AstroidManager(), "unittest", IsolatedAsyncioTestCaseImport
-    )
+register_module_extender(AstroidManager(), "unittest", IsolatedAsyncioTestCaseImport)

astroid/const.py

@@ -7,11 +7,9 @@
 from pathlib import Path
 
 PY38 = sys.version_info[:2] == (3, 8)
-PY38_PLUS = sys.version_info >= (3, 8)
 PY39_PLUS = sys.version_info >= (3, 9)
 PY310_PLUS = sys.version_info >= (3, 10)
 PY311_PLUS = sys.version_info >= (3, 11)
-BUILTINS = "builtins"  # TODO Remove in 2.8
 
 WIN32 = sys.platform == "win32"
 
@@ -28,12 +26,6 @@ class Context(enum.Enum):
     Del = 3
 
 
-# TODO Remove in 3.0 in favor of Context
-Load = Context.Load
-Store = Context.Store
-Del = Context.Del
-
-
 ASTROID_INSTALL_DIRECTORY = Path(__file__).parent
 BRAIN_MODULES_DIRECTORY = ASTROID_INSTALL_DIRECTORY / "brain"
 

astroid/nodes/scoped_nodes/scoped_nodes.py

@@ -19,7 +19,7 @@
 from typing import TYPE_CHECKING, ClassVar, Literal, NoReturn, TypeVar, overload
 
 from astroid import bases, util
-from astroid.const import IS_PYPY, PY38, PY38_PLUS, PY39_PLUS, PYPY_7_3_11_PLUS
+from astroid.const import IS_PYPY, PY38, PY39_PLUS, PYPY_7_3_11_PLUS
 from astroid.context import (
     CallContext,
     InferenceContext,
@@ -2000,7 +2000,7 @@ def fromlineno(self) -> int:
 
         Can also return 0 if the line can not be determined.
         """
-        if not PY38_PLUS or IS_PYPY and PY38 and not PYPY_7_3_11_PLUS:
+        if IS_PYPY and PY38 and not PYPY_7_3_11_PLUS:
             # For Python < 3.8 the lineno is the line number of the first decorator.
             # We want the class statement lineno. Similar to 'FunctionDef.fromlineno'
             # PyPy (3.8): Fixed with version v7.3.11

astroid/rebuilder.py

@@ -18,7 +18,7 @@
 
 from astroid import nodes
 from astroid._ast import ParserModule, get_parser_module, parse_function_type_comment
-from astroid.const import IS_PYPY, PY38, PY38_PLUS, PY39_PLUS, Context
+from astroid.const import IS_PYPY, PY38, PY39_PLUS, Context
 from astroid.manager import AstroidManager
 from astroid.nodes import NodeNG
 from astroid.nodes.utils import Position
@@ -74,10 +74,8 @@ def _get_doc(self, node: T_Doc) -> tuple[T_Doc, ast.Constant | ast.Str | None]:
         try:
             if node.body and isinstance(node.body[0], ast.Expr):
                 first_value = node.body[0].value
-                if isinstance(first_value, ast.Str) or (
-                    PY38_PLUS
-                    and isinstance(first_value, ast.Constant)
-                    and isinstance(first_value.value, str)
+                if isinstance(first_value, ast.Constant) and isinstance(
+                    first_value.value, str
                 ):
                     doc_ast_node = first_value
                     node.body = node.body[1:]
@@ -158,56 +156,6 @@ def _get_position_info(
             end_col_offset=t.end[1],
         )
 
-    def _fix_doc_node_position(self, node: NodesWithDocsType) -> None:
-        """Fix start and end position of doc nodes for Python < 3.8."""
-        if not self._data or not node.doc_node or node.lineno is None:
-            return
-        if PY38_PLUS:
-            return
-
-        lineno = node.lineno or 1  # lineno of modules is 0
-        end_range: int | None = node.doc_node.lineno
-        if IS_PYPY and not PY39_PLUS:
-            end_range = None
-        # pylint: disable-next=unsubscriptable-object
-        data = "\n".join(self._data[lineno - 1 : end_range])
-
-        found_start, found_end = False, False
-        open_brackets = 0
-        skip_token: set[int] = {token.NEWLINE, token.INDENT, token.NL, token.COMMENT}
-
-        if isinstance(node, nodes.Module):
-            found_end = True
-
-        for t in generate_tokens(StringIO(data).readline):
-            if found_end is False:
-                if (
-                    found_start is False
-                    and t.type == token.NAME
-                    and t.string in {"def", "class"}
-                ):
-                    found_start = True
-                elif found_start is True and t.type == token.OP:
-                    if t.exact_type == token.COLON and open_brackets == 0:
-                        found_end = True
-                    elif t.exact_type == token.LPAR:
-                        open_brackets += 1
-                    elif t.exact_type == token.RPAR:
-                        open_brackets -= 1
-                continue
-            if t.type in skip_token:
-                continue
-            if t.type == token.STRING:
-                break
-            return
-        else:
-            return
-
-        node.doc_node.lineno = lineno + t.start[0] - 1
-        node.doc_node.col_offset = t.start[1]
-        node.doc_node.end_lineno = lineno + t.end[0] - 1
-        node.doc_node.end_col_offset = t.end[1]
-
     def _reset_end_lineno(self, newnode: nodes.NodeNG) -> None:
         """Reset end_lineno and end_col_offset attributes for PyPy 3.8.
 
@@ -246,7 +194,6 @@ def visit_module(
             [self.visit(child, newnode) for child in node.body],
             doc_node=self.visit(doc_ast_node, newnode),
         )
-        self._fix_doc_node_position(newnode)
         if IS_PYPY and PY38:
             self._reset_end_lineno(newnode)
         return newnode
@@ -953,7 +900,6 @@ def visit_classdef(
             position=self._get_position_info(node, newnode),
             doc_node=self.visit(doc_ast_node, newnode),
         )
-        self._fix_doc_node_position(newnode)
         return newnode
 
     def visit_continue(self, node: ast.Continue, parent: NodeNG) -> nodes.Continue:
@@ -1225,7 +1171,7 @@ def _visit_functiondef(
         node, doc_ast_node = self._get_doc(node)
 
         lineno = node.lineno
-        if PY38_PLUS and node.decorator_list:
+        if node.decorator_list:
             # Python 3.8 sets the line number of a decorated function
             # to be the actual line number of the function, but the
             # previous versions expected the decorator's line number instead.
@@ -1265,7 +1211,6 @@ def _visit_functiondef(
             position=self._get_position_info(node, newnode),
             doc_node=self.visit(doc_ast_node, newnode),
         )
-        self._fix_doc_node_position(newnode)
         self._global_names.pop()
         return newnode
 

tests/test_builder.py

@@ -19,7 +19,7 @@
 import pytest
 
 from astroid import Instance, builder, nodes, test_utils, util
-from astroid.const import IS_PYPY, PY38, PY38_PLUS, PY39_PLUS, PYPY_7_3_11_PLUS
+from astroid.const import IS_PYPY, PY38, PY39_PLUS, PYPY_7_3_11_PLUS
 from astroid.exceptions import (
     AstroidBuildingError,
     AstroidSyntaxError,
@@ -62,10 +62,7 @@ def test_callfunc_lineno(self) -> None:
             else:
                 self.assertEqual(strarg.tolineno, 5)
         else:
-            if not PY38_PLUS:
-                self.assertEqual(strarg.fromlineno, 5)
-            else:
-                self.assertEqual(strarg.fromlineno, 4)
+            self.assertEqual(strarg.fromlineno, 4)
             self.assertEqual(strarg.tolineno, 5)
         namearg = callfunc.args[1]
         self.assertIsInstance(namearg, nodes.Name)
@@ -160,8 +157,8 @@ class C:  # L13
 
         c = ast_module.body[2]
         assert isinstance(c, nodes.ClassDef)
-        if not PY38_PLUS or IS_PYPY and PY38 and not PYPY_7_3_11_PLUS:
-            # Not perfect, but best we can do for Python 3.7 and PyPy 3.8 (< v7.3.11).
+        if IS_PYPY and PY38 and not PYPY_7_3_11_PLUS:
+            # Not perfect, but best we can do for PyPy 3.8 (< v7.3.11).
             # Can't detect closing bracket on new line.
             assert c.fromlineno == 12
         else:
@@ -923,8 +920,7 @@ def test_module_build_dunder_file() -> None:
     assert module.path[0] == collections.__file__
 
 
-@pytest.mark.skipif(
-    PY38_PLUS,
+@pytest.mark.xfail(
     reason=(
         "The builtin ast module does not fail with a specific error "
         "for syntax error caused by invalid type comments."

tests/test_inference.py

@@ -31,7 +31,7 @@
 from astroid.arguments import CallSite
 from astroid.bases import BoundMethod, Instance, UnboundMethod, UnionType
 from astroid.builder import AstroidBuilder, _extract_single_node, extract_node, parse
-from astroid.const import PY38_PLUS, PY39_PLUS, PY310_PLUS
+from astroid.const import PY39_PLUS, PY310_PLUS
 from astroid.context import CallContext, InferenceContext
 from astroid.exceptions import (
     AstroidTypeError,
@@ -959,8 +959,7 @@ class D(C):
         self.assertEqual("module.C", should_be_c[0].qname())
         self.assertEqual("module.D", should_be_d[0].qname())
 
-    @pytest.mark.skipif(
-        PY38_PLUS,
+    @pytest.mark.xfail(
         reason="pathlib.Path cannot be inferred on Python 3.8",
     )
     def test_factory_methods_inside_binary_operation(self):
@@ -6588,7 +6587,6 @@ def test_custom_decorators_for_classmethod_and_staticmethods(code, obj, obj_type
     assert inferred.type == obj_type
 
 
-@pytest.mark.skipif(not PY38_PLUS, reason="Needs dataclasses available")
 @pytest.mark.skipif(
     PY39_PLUS,
     reason="Exact inference with dataclasses (replace function) in python3.9",