Add fake __getattribute__ to AbstractSandbox to let type-checkers know it has a bunch of dynamic methods (#4708)

Author: abravalheri

setuptools/sandbox.py

@@ -12,7 +12,7 @@
 import tempfile
 import textwrap
 from types import TracebackType
-from typing import TYPE_CHECKING, ClassVar
+from typing import TYPE_CHECKING, Any, ClassVar
 
 import pkg_resources
 from pkg_resources import working_set
@@ -406,6 +406,11 @@ def _remap_pair(self, operation, src, dst, *args, **kw):
             self._remap_input(operation + '-to', dst, *args, **kw),
         )
 
+    if TYPE_CHECKING:
+        # This is a catch-all for all the dynamically created attributes.
+        # This isn't public API anyway
+        def __getattribute__(self, name: str) -> Any: ...
+
 
 if hasattr(os, 'devnull'):
     _EXCEPTIONS = [os.devnull]