Drop support for Python 3.7 (#8609)

* Drop support for Python 3.7
* Update py-version + classifier
* Update functional tests

.github/workflows/primer_run_main.yaml

@@ -29,7 +29,7 @@ jobs:
     timeout-minutes: 120
     strategy:
       matrix:
-        python-version: ["3.7", "3.11"]
+        python-version: ["3.8", "3.11"]
     steps:
       - name: Check out code from GitHub
         uses: actions/checkout@v3.5.2

.github/workflows/primer_run_pr.yaml

@@ -38,7 +38,7 @@ jobs:
     timeout-minutes: 120
     strategy:
       matrix:
-        python-version: ["3.7", "3.11"]
+        python-version: ["3.8", "3.11"]
     steps:
       - name: Check out code from GitHub
         uses: actions/checkout@v3.5.2

.github/workflows/tests.yaml

@@ -31,7 +31,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.7, 3.8, 3.9, "3.10", "3.11"]
+        python-version: [3.8, 3.9, "3.10", "3.11"]
     outputs:
       python-key: ${{ steps.generate-python-key.outputs.key }}
     steps:
@@ -175,7 +175,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.7, 3.8, 3.9, "3.10", "3.11"]
+        python-version: [3.8, 3.9, "3.10", "3.11"]
     steps:
       - name: Set temp directory
         run: echo "TEMP=$env:USERPROFILE\AppData\Local\Temp" >> $env:GITHUB_ENV
@@ -225,7 +225,7 @@ jobs:
       fail-fast: false
       matrix:
         # We only run on the oldest supported version on Mac
-        python-version: [3.7]
+        python-version: [3.8]
     steps:
       - name: Check out code from GitHub
         uses: actions/checkout@v3.5.2
@@ -269,7 +269,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["pypy-3.7", "pypy-3.8", "pypy-3.9"]
+        python-version: ["pypy-3.8", "pypy-3.9"]
     steps:
       - name: Check out code from GitHub
         uses: actions/checkout@v3.5.2

.pre-commit-config.yaml

@@ -39,7 +39,7 @@ repos:
     rev: v3.3.1
     hooks:
       - id: pyupgrade
-        args: [--py37-plus]
+        args: [--py38-plus]
         exclude: *fixtures
   - repo: https://github.com/PyCQA/isort
     rev: 5.12.0

README.rst

@@ -45,7 +45,7 @@ What is Pylint?
 ---------------
 
 Pylint is a `static code analyser`_ for Python 2 or 3. The latest version supports Python
-3.7.2 and above.
+3.8.0 and above.
 
 .. _`static code analyser`: https://en.wikipedia.org/wiki/Static_code_analysis
 

doc/exts/pylint_extensions.py

@@ -11,7 +11,7 @@
 import os
 import re
 import sys
-from typing import Any
+from typing import Any, TypedDict
 
 import sphinx
 from sphinx.application import Sphinx
@@ -22,11 +22,6 @@
 from pylint.typing import MessageDefinitionTuple, OptionDict, ReportsCallable
 from pylint.utils import get_rst_title
 
-if sys.version_info >= (3, 8):
-    from typing import TypedDict
-else:
-    from typing_extensions import TypedDict
-
 
 class _CheckerInfo(TypedDict):
     """Represents data about a checker."""

doc/whatsnew/fragments/6306.breaking

@@ -0,0 +1,3 @@
+Remove support for Python 3.7.
+
+Refs #6306

pylint/checkers/__init__.py

@@ -42,8 +42,7 @@
 
 from __future__ import annotations
 
-import sys
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Literal
 
 from pylint.checkers.base_checker import (
     BaseChecker,
@@ -53,11 +52,6 @@
 from pylint.checkers.deprecated import DeprecatedMixin
 from pylint.utils import LinterStats, diff_string, register_plugins
 
-if sys.version_info >= (3, 8):
-    from typing import Literal
-else:
-    from typing_extensions import Literal
-
 if TYPE_CHECKING:
     from pylint.lint import PyLinter
 

pylint/checkers/base/basic_checker.py

@@ -8,9 +8,8 @@
 
 import collections
 import itertools
-import sys
 from collections.abc import Iterator
-from typing import TYPE_CHECKING, cast
+from typing import TYPE_CHECKING, Literal, cast
 
 import astroid
 from astroid import nodes, objects, util
@@ -24,11 +23,6 @@
 if TYPE_CHECKING:
     from pylint.lint.pylinter import PyLinter
 
-if sys.version_info >= (3, 8):
-    from typing import Literal
-else:
-    from typing_extensions import Literal
-
 
 class _BasicChecker(BaseChecker):
     """Permits separating multiple checks with the same checker name into

pylint/checkers/base/docstring_checker.py

@@ -7,7 +7,7 @@
 from __future__ import annotations
 
 import re
-import sys
+from typing import Literal
 
 import astroid
 from astroid import nodes
@@ -21,11 +21,6 @@
     is_property_setter,
 )
 
-if sys.version_info >= (3, 8):
-    from typing import Literal
-else:
-    from typing_extensions import Literal
-
 # do not require a doc string on private/system methods
 NO_REQUIRED_DOC_RGX = re.compile("^_")
 

pylint/checkers/classes/class_checker.py

@@ -7,9 +7,9 @@
 from __future__ import annotations
 
 import collections
-import sys
 from collections import defaultdict
 from collections.abc import Callable, Sequence
+from functools import cached_property
 from itertools import chain, zip_longest
 from re import Pattern
 from typing import TYPE_CHECKING, Any, Union
@@ -47,11 +47,6 @@
     from pylint.lint.pylinter import PyLinter
 
 
-if sys.version_info >= (3, 8):
-    from functools import cached_property
-else:
-    from astroid.decorators import cachedproperty as cached_property
-
 _AccessNodes = Union[nodes.Attribute, nodes.AssignAttr]
 
 INVALID_BASE_CLASSES = {"bool", "range", "slice", "memoryview"}

pylint/checkers/format.py

@@ -13,11 +13,10 @@
 
 from __future__ import annotations
 
-import sys
 import tokenize
 from functools import reduce
 from re import Match
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Literal
 
 from astroid import nodes
 
@@ -31,10 +30,6 @@
 if TYPE_CHECKING:
     from pylint.lint import PyLinter
 
-if sys.version_info >= (3, 8):
-    from typing import Literal
-else:
-    from typing_extensions import Literal
 
 _KEYWORD_TOKENS = {
     "assert",

pylint/checkers/imports.py

@@ -12,6 +12,7 @@
 import sys
 from collections import defaultdict
 from collections.abc import ItemsView, Sequence
+from functools import cached_property
 from typing import TYPE_CHECKING, Any, Dict, List, Union
 
 import astroid
@@ -38,11 +39,6 @@
 if TYPE_CHECKING:
     from pylint.lint import PyLinter
 
-if sys.version_info >= (3, 8):
-    from functools import cached_property
-else:
-    from astroid.decorators import cachedproperty as cached_property
-
 
 # The dictionary with Any should actually be a _ImportTree again
 # but mypy doesn't support recursive types yet

pylint/checkers/logging.py

@@ -7,8 +7,7 @@
 from __future__ import annotations
 
 import string
-import sys
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Literal
 
 import astroid
 from astroid import bases, nodes
@@ -19,11 +18,6 @@
 from pylint.checkers.utils import infer_all
 from pylint.typing import MessageDefinitionTuple
 
-if sys.version_info >= (3, 8):
-    from typing import Literal
-else:
-    from typing_extensions import Literal
-
 if TYPE_CHECKING:
     from pylint.lint import PyLinter
 

pylint/checkers/raw_metrics.py

@@ -4,19 +4,13 @@
 
 from __future__ import annotations
 
-import sys
 import tokenize
-from typing import TYPE_CHECKING, Any, cast
+from typing import TYPE_CHECKING, Any, Literal, cast
 
 from pylint.checkers import BaseTokenChecker
 from pylint.reporters.ureports.nodes import Paragraph, Section, Table, Text
 from pylint.utils import LinterStats, diff_string
 
-if sys.version_info >= (3, 8):
-    from typing import Literal
-else:
-    from typing_extensions import Literal
-
 if TYPE_CHECKING:
     from pylint.lint import PyLinter
 

pylint/checkers/refactoring/refactoring_checker.py

@@ -7,10 +7,9 @@
 import collections
 import copy
 import itertools
-import sys
 import tokenize
 from collections.abc import Iterator
-from functools import reduce
+from functools import cached_property, reduce
 from re import Pattern
 from typing import TYPE_CHECKING, Any, NamedTuple, Union, cast
 
@@ -27,10 +26,6 @@
 if TYPE_CHECKING:
     from pylint.lint import PyLinter
 
-if sys.version_info >= (3, 8):
-    from functools import cached_property
-else:
-    from astroid.decorators import cachedproperty as cached_property
 
 NodesWithNestedBlocks = Union[
     nodes.TryExcept, nodes.TryFinally, nodes.While, nodes.For, nodes.If

pylint/checkers/spelling.py

@@ -7,21 +7,15 @@
 from __future__ import annotations
 
 import re
-import sys
 import tokenize
 from re import Pattern
-from typing import TYPE_CHECKING, Any
+from typing import TYPE_CHECKING, Any, Literal
 
 from astroid import nodes
 
 from pylint.checkers import BaseTokenChecker
 from pylint.checkers.utils import only_required_for_messages
 
-if sys.version_info >= (3, 8):
-    from typing import Literal
-else:
-    from typing_extensions import Literal
-
 if TYPE_CHECKING:
     from pylint.lint import PyLinter
 

pylint/checkers/strings.py

@@ -8,11 +8,10 @@
 
 import collections
 import re
-import sys
 import tokenize
 from collections import Counter
 from collections.abc import Iterable, Sequence
-from typing import TYPE_CHECKING
+from typing import TYPE_CHECKING, Literal
 
 import astroid
 from astroid import bases, nodes, util
@@ -26,11 +25,6 @@
 if TYPE_CHECKING:
     from pylint.lint import PyLinter
 
-if sys.version_info >= (3, 8):
-    from typing import Literal
-else:
-    from typing_extensions import Literal
-
 
 _AST_NODE_STR_TYPES = ("__builtin__.unicode", "__builtin__.str", "builtins.str")
 # Prefixes for both strings and bytes literals per

pylint/checkers/typecheck.py

@@ -14,9 +14,9 @@
 import sys
 import types
 from collections.abc import Callable, Iterable, Iterator, Sequence
-from functools import singledispatch
+from functools import cached_property, singledispatch
 from re import Pattern
-from typing import TYPE_CHECKING, Any, TypeVar, Union
+from typing import TYPE_CHECKING, Any, Literal, TypeVar, Union
 
 import astroid
 import astroid.exceptions
@@ -53,13 +53,6 @@
 from pylint.interfaces import HIGH, INFERENCE
 from pylint.typing import MessageDefinitionTuple
 
-if sys.version_info >= (3, 8):
-    from functools import cached_property
-    from typing import Literal
-else:
-    from astroid.decorators import cachedproperty as cached_property
-    from typing_extensions import Literal
-
 if TYPE_CHECKING:
     from pylint.lint import PyLinter
 

pylint/checkers/utils.py

@@ -1942,7 +1942,7 @@ def is_typing_member(node: nodes.NodeNG, names_to_check: tuple[str, ...]) -> boo
     return False
 
 
-@lru_cache()
+@lru_cache
 def in_for_else_branch(parent: nodes.NodeNG, stmt: nodes.Statement) -> bool:
     """Returns True if stmt is inside the else branch for a parent For stmt."""
     return isinstance(parent, nodes.For) and any(