Drop support for Python 2 (#8272)

tests/check_consistent.py

@@ -3,22 +3,13 @@
 # For security (and simplicity) reasons, only a limited kind of files can be
 # present in /stdlib and /stubs directories, see README for detail. Here we
 # verify these constraints.
-
-# In addition, for various reasons we need the contents of certain files to be
-# duplicated in two places, for example stdlib/@python2/builtins.pyi and
-# stdlib/@python2/__builtin__.pyi must be identical.  In the past we used
-# symlinks but that doesn't always work on Windows, so now you must
-# manually update both files, and this test verifies that they are
-# identical.  The list below indicates which sets of files must match.
 from __future__ import annotations
 
-import filecmp
 import os
 import re
 
 import tomli
 
-consistent_files = [{"stdlib/@python2/builtins.pyi", "stdlib/@python2/__builtin__.pyi"}]
 metadata_keys = {"version", "requires", "extra_description", "obsolete_since", "no_longer_updated", "tool"}
 tool_keys = {"stubtest": {"skip", "apt_dependencies", "ignore_missing_stub"}}
 allowed_files = {"README.md"}
@@ -47,16 +38,7 @@ def check_stdlib() -> None:
                 assert entry == "VERSIONS", f"Unexpected file in stdlib root: {entry}"
             assert name.isidentifier(), "Bad file name in stdlib"
         else:
-            if entry == "@python2":
-                continue
             assert_stubs_only(os.path.join("stdlib", entry))
-    for entry in os.listdir("stdlib/@python2"):
-        if os.path.isfile(os.path.join("stdlib/@python2", entry)):
-            name, ext = os.path.splitext(entry)
-            assert name.isidentifier(), "Bad file name in stdlib"
-            assert ext == ".pyi", "Unexpected file in stdlib/@python2 root"
-        else:
-            assert_stubs_only(os.path.join("stdlib/@python2", entry))
 
 
 def check_stubs() -> None:
@@ -82,15 +64,6 @@ def check_same_files() -> None:
         _, ext = os.path.splitext(file)
         if ext == ".pyi" and os.path.islink(file):
             raise ValueError(no_symlink.format(file))
-    for file1, *others in consistent_files:
-        f1 = os.path.join(os.getcwd(), file1)
-        for file2 in others:
-            f2 = os.path.join(os.getcwd(), file2)
-            if not filecmp.cmp(f1, f2):
-                raise ValueError(
-                    "File {f1} does not match file {f2}. Please copy it to {f2}\n"
-                    "Run either:\ncp {f1} {f2}\nOr:\ncp {f2} {f1}".format(f1=file1, f2=file2)
-                )
 
 
 _VERSIONS_RE = re.compile(r"^([a-zA-Z_][a-zA-Z0-9_.]*): [23]\.\d{1,2}-(?:[23]\.\d{1,2})?$")
@@ -121,8 +94,6 @@ def check_versions() -> None:
 def _find_stdlib_modules() -> set[str]:
     modules = set()
     for path, _, files in os.walk("stdlib"):
-        if "@python2" in path:
-            continue
         for filename in files:
             base_module = ".".join(os.path.normpath(path).split(os.sep)[1:])
             if filename == "__init__.pyi":