Testing

.github/workflows/ci.yaml

@@ -224,7 +224,7 @@ jobs:
       - name: Run pytest
         run: |
           . venv/bin/activate
-          pytest --benchmark-disable --cov --cov-report= tests/
+          pytest -vv --durations=20 --benchmark-disable --cov --cov-report= tests/
       - name: Upload coverage artifact
         uses: actions/upload-artifact@v2.3.1
         with:
@@ -408,7 +408,7 @@ jobs:
       - name: Run pytest
         run: |
           . venv\\Scripts\\activate
-          pytest --benchmark-disable tests/
+          pytest -vv --durations=20 --benchmark-disable tests/
 
   prepare-tests-pypy:
     name: tests / prepare / ${{ matrix.python-version }} / Linux
@@ -486,4 +486,4 @@ jobs:
       - name: Run pytest
         run: |
           . venv/bin/activate
-          pytest --benchmark-disable tests/
+          pytest -vv --durations=20 --benchmark-disable tests/

ChangeLog

@@ -9,6 +9,14 @@ Release date: TBA
 ..
   Put new features here and also in 'doc/whatsnew/2.13.rst'
 
+* ``using-f-string-in-unsupported-version`` and ``using-final-decorator-in-unsupported-version`` msgids
+    were renamed from ``W1601`` and ``W1602`` to ``W2601`` and ``W2602``. Disabling using these msgids will break.
+    This is done in order to restore consistency with the already existing msgids for ``apply-builtin`` and
+    ``basestring-builtin`` from the now deleted python 3K+ checker. There is now a check that we're not using
+    existing msgids or symbols from deleted checkers.
+
+  Closes #5729
+
 * Add ``--recursive`` option to allow recursive discovery of all modules and packages in subtree. Running pylint with
   ``--recursive=y`` option will check all discovered ``.py`` files and packages found inside subtree of directory provided
   as parameter to pylint.

doc/whatsnew/2.13.rst

@@ -92,6 +92,14 @@ Extensions
 Other Changes
 =============
 
+* ``using-f-string-in-unsupported-version`` and ``using-final-decorator-in-unsupported-version`` msgids
+    were renamed from ``W1601`` and ``W1602`` to ``W2601`` and ``W2602``. Disables using these msgids will break.
+    This is done in order to restore consistency with the already existing msgids for ``apply-builtin`` and
+    ``basestring-builtin`` from the now deleted python 3K+ checker. There is now a check that we're not using
+    existing msgids or symbols from deleted checkers.
+
+  Closes #5729
+
 * Add ``--recursive`` option to allow recursive discovery of all modules and packages in subtree. Running pylint with
   ``--recursive=y`` option will check all discovered ``.py`` files and packages found inside subtree of directory provided
   as parameter to pylint.

pylint/checkers/__init__.py

@@ -37,14 +37,15 @@
 13: string_format
 14: string_constant
 15: stdlib
-16: python3
+16: python3 (This one was deleted but needs to be reserved for consistency with old messages)
 17: refactoring
 .
 .
 .
 24: non-ascii-names
 25: unicode
-26-50: not yet used: reserved for future internal checkers.
+26: unsupported_version
+27-50: not yet used: reserved for future internal checkers.
 This file is not updated. Use
    script/get_unused_message_id_category.py
 to get the next free checker id.

pylint/checkers/unsupported_version.py

@@ -35,13 +35,13 @@ class UnsupportedVersionChecker(BaseChecker):
     __implements__ = (IAstroidChecker,)
     name = "unsupported_version"
     msgs = {
-        "W1601": (
+        "W2601": (
             "F-strings are not supported by all versions included in the py-version setting",
             "using-f-string-in-unsupported-version",
             "Used when the py-version set by the user is lower than 3.6 and pylint encounters "
             "a f-string.",
         ),
-        "W1602": (
+        "W2602": (
             "typing.final is not supported by all versions included in the py-version setting",
             "using-final-decorator-in-unsupported-version",
             "Used when the py-version set by the user is lower than 3.8 and pylint encounters "

pylint/constants.py

@@ -2,7 +2,7 @@
 # For details: https://github.com/PyCQA/pylint/blob/main/LICENSE
 import platform
 import sys
-from typing import Dict
+from typing import Dict, List, NamedTuple, Tuple
 
 import astroid
 import platformdirs
@@ -72,3 +72,107 @@ class WarningScope:
     "class_const": "class constant",
     "inlinevar": "inline iteration",
 }
+
+
+class DeletedMessage(NamedTuple):
+    msgid: str
+    symbol: str
+    old_names: List[Tuple[str, str]] = []
+
+
+DELETED_MSGID_PREFIXES = [
+    16,  # the PY3K+ checker, see https://github.com/PyCQA/pylint/pull/4942
+]
+
+DELETED_MESSAGES = [
+    # Everything until the next comment is from the
+    # PY3K+ checker, see https://github.com/PyCQA/pylint/pull/4942
+    DeletedMessage("W1601", "apply-builtin"),
+    DeletedMessage("E1601", "print-statement"),
+    DeletedMessage("E1602", "parameter-unpacking"),
+    DeletedMessage(
+        "E1603", "unpacking-in-except", [("W0712", "old-unpacking-in-except")]
+    ),
+    DeletedMessage("E1604", "old-raise-syntax", [("W0121", "old-old-raise-syntax")]),
+    DeletedMessage("E1605", "backtick", [("W0333", "old-backtick")]),
+    DeletedMessage("E1609", "import-star-module-level"),
+    DeletedMessage("W1601", "apply-builtin"),
+    DeletedMessage("W1602", "basestring-builtin"),
+    DeletedMessage("W1603", "buffer-builtin"),
+    DeletedMessage("W1604", "cmp-builtin"),
+    DeletedMessage("W1605", "coerce-builtin"),
+    DeletedMessage("W1606", "execfile-builtin"),
+    DeletedMessage("W1607", "file-builtin"),
+    DeletedMessage("W1608", "long-builtin"),
+    DeletedMessage("W1609", "raw_input-builtin"),
+    DeletedMessage("W1610", "reduce-builtin"),
+    DeletedMessage("W1611", "standarderror-builtin"),
+    DeletedMessage("W1612", "unicode-builtin"),
+    DeletedMessage("W1613", "xrange-builtin"),
+    DeletedMessage("W1614", "coerce-method"),
+    DeletedMessage("W1615", "delslice-method"),
+    DeletedMessage("W1616", "getslice-method"),
+    DeletedMessage("W1617", "setslice-method"),
+    DeletedMessage("W1618", "no-absolute-import"),
+    DeletedMessage("W1619", "old-division"),
+    DeletedMessage("W1620", "dict-iter-method"),
+    DeletedMessage("W1621", "dict-view-method"),
+    DeletedMessage("W1622", "next-method-called"),
+    DeletedMessage("W1623", "metaclass-assignment"),
+    DeletedMessage(
+        "W1624", "indexing-exception", [("W0713", "old-indexing-exception")]
+    ),
+    DeletedMessage("W1625", "raising-string", [("W0701", "old-raising-string")]),
+    DeletedMessage("W1626", "reload-builtin"),
+    DeletedMessage("W1627", "oct-method"),
+    DeletedMessage("W1628", "hex-method"),
+    DeletedMessage("W1629", "nonzero-method"),
+    DeletedMessage("W1630", "cmp-method"),
+    DeletedMessage("W1632", "input-builtin"),
+    DeletedMessage("W1633", "round-builtin"),
+    DeletedMessage("W1634", "intern-builtin"),
+    DeletedMessage("W1635", "unichr-builtin"),
+    DeletedMessage(
+        "W1636", "map-builtin-not-iterating", [("W1631", "implicit-map-evaluation")]
+    ),
+    DeletedMessage("W1637", "zip-builtin-not-iterating"),
+    DeletedMessage("W1638", "range-builtin-not-iterating"),
+    DeletedMessage("W1639", "filter-builtin-not-iterating"),
+    DeletedMessage("W1640", "using-cmp-argument"),
+    DeletedMessage("W1641", "eq-without-hash"),
+    DeletedMessage("W1642", "div-method"),
+    DeletedMessage("W1643", "idiv-method"),
+    DeletedMessage("W1644", "rdiv-method"),
+    DeletedMessage("W1645", "exception-message-attribute"),
+    DeletedMessage("W1646", "invalid-str-codec"),
+    DeletedMessage("W1647", "sys-max-int"),
+    DeletedMessage("W1648", "bad-python3-import"),
+    DeletedMessage("W1649", "deprecated-string-function"),
+    DeletedMessage("W1650", "deprecated-str-translate-call"),
+    DeletedMessage("W1651", "deprecated-itertools-function"),
+    DeletedMessage("W1652", "deprecated-types-field"),
+    DeletedMessage("W1653", "next-method-defined"),
+    DeletedMessage("W1654", "dict-items-not-iterating"),
+    DeletedMessage("W1655", "dict-keys-not-iterating"),
+    DeletedMessage("W1656", "dict-values-not-iterating"),
+    DeletedMessage("W1657", "deprecated-operator-function"),
+    DeletedMessage("W1658", "deprecated-urllib-function"),
+    DeletedMessage("W1659", "xreadlines-attribute"),
+    DeletedMessage("W1660", "deprecated-sys-function"),
+    DeletedMessage("W1661", "exception-escape"),
+    DeletedMessage("W1662", "comprehension-escape"),
+    # https://github.com/PyCQA/pylint/pull/3578
+    DeletedMessage("W0312", "mixed-indentation"),
+    # https://github.com/PyCQA/pylint/pull/3577
+    DeletedMessage(
+        "C0326",
+        "bad-whitespace",
+        [
+            ("C0323", "no-space-after-operator"),
+            ("C0324", "no-space-after-comma"),
+            ("C0322", "no-space-before-operator"),
+        ],
+    ),
+    # https://github.com/PyCQA/pylint/pull/3571
+    DeletedMessage("C0330", "bad-continuation"),
+]

script/get_unused_message_id_category.py

@@ -5,6 +5,7 @@
 from typing import List
 
 from pylint.checkers import initialize as initialize_checkers
+from pylint.constants import DELETED_MSGID_PREFIXES
 from pylint.extensions import initialize as initialize_extensions
 from pylint.lint.pylinter import PyLinter
 
@@ -18,6 +19,8 @@ def register_all_checkers_and_plugins(linter: "PyLinter") -> None:
 
 def get_next_code_category(message_ids: List[str]) -> int:
     categories = sorted({int(i[:2]) for i in message_ids})
+    # We add the prefixes for deleted checkers
+    categories += DELETED_MSGID_PREFIXES
     for i in categories:
         if i + 1 not in categories:
             return i + 1

tests/message/test_no_removed_msgid_or_symbol_used.py

@@ -0,0 +1,17 @@
+# Licensed under the GPL: https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+# For details: https://github.com/PyCQA/pylint/blob/main/LICENSE
+
+from pylint.constants import DELETED_MESSAGES
+from pylint.lint import PyLinter
+
+
+def test_no_removed_msgid_or_symbol_used(linter: PyLinter) -> None:
+    """Tests that we're not using deleted msgid or symbol.
+
+    This could cause occasional bugs, but more importantly confusion and inconsistencies
+    when searching for old msgids online. See https://github.com/PyCQA/pylint/issues/5729
+    """
+    for msgid, symbol, old_names in DELETED_MESSAGES:
+        linter.msgs_store.message_id_store.register_message_definition(
+            msgid, symbol, old_names
+        )