RustPython · youknowone · Aug 17, 2022 · Jul 24, 2022 · Jul 24, 2022 · Jul 17, 2022
diff --git a/Lib/importlib/__init__.py b/Lib/importlib/__init__.py
@@ -34,7 +34,7 @@
     import _frozen_importlib_external as _bootstrap_external
 except ImportError:
     from . import _bootstrap_external
-    _bootstrap_external._setup(_bootstrap)
+    _bootstrap_external._set_bootstrap_module(_bootstrap)
     _bootstrap._bootstrap_external = _bootstrap_external
 else:
     _bootstrap_external.__name__ = 'importlib._bootstrap_external'
@@ -54,7 +54,6 @@
 # Fully bootstrapped at this point, import whatever you like, circular
 # dependencies and startup overhead minimisation permitting :)
 
-import types
 import warnings
 
 
@@ -79,8 +78,8 @@ def find_loader(name, path=None):
     This function is deprecated in favor of importlib.util.find_spec().
 
     """
-    warnings.warn('Deprecated since Python 3.4. '
-                  'Use importlib.util.find_spec() instead.',
+    warnings.warn('Deprecated since Python 3.4 and slated for removal in '
+                  'Python 3.12; use importlib.util.find_spec() instead',
                   DeprecationWarning, stacklevel=2)
     try:
         loader = sys.modules[name].__loader__
@@ -136,12 +135,13 @@ def reload(module):
     The module must have been successfully imported before.
 
     """
-    if not module or not isinstance(module, types.ModuleType):
-        raise TypeError("reload() argument must be a module")
     try:
         name = module.__spec__.name
     except AttributeError:
-        name = module.__name__
+        try:
+            name = module.__name__
+        except AttributeError:
+            raise TypeError("reload() argument must be a module")
 
     if sys.modules.get(name) is not module:
         msg = "module {} not in sys.modules"

diff --git a/Lib/importlib/_abc.py b/Lib/importlib/_abc.py
@@ -0,0 +1,54 @@
+"""Subset of importlib.abc used to reduce importlib.util imports."""
+from . import _bootstrap
+import abc
+import warnings
+
+
+class Loader(metaclass=abc.ABCMeta):
+
+    """Abstract base class for import loaders."""
+
+    def create_module(self, spec):
+        """Return a module to initialize and into which to load.
+
+        This method should raise ImportError if anything prevents it
+        from creating a new module.  It may return None to indicate
+        that the spec should create the new module.
+        """
+        # By default, defer to default semantics for the new module.
+        return None
+
+    # We don't define exec_module() here since that would break
+    # hasattr checks we do to support backward compatibility.
+
+    def load_module(self, fullname):
+        """Return the loaded module.
+
+        The module must be added to sys.modules and have import-related
+        attributes set properly.  The fullname is a str.
+
+        ImportError is raised on failure.
+
+        This method is deprecated in favor of loader.exec_module(). If
+        exec_module() exists then it is used to provide a backwards-compatible
+        functionality for this method.
+
+        """
+        if not hasattr(self, 'exec_module'):
+            raise ImportError
+        # Warning implemented in _load_module_shim().
+        return _bootstrap._load_module_shim(self, fullname)
+
+    def module_repr(self, module):
+        """Return a module's repr.
+
+        Used by the module type when the method does not raise
+        NotImplementedError.
+
+        This method is deprecated.
+
+        """
+        warnings.warn("importlib.abc.Loader.module_repr() is deprecated and "
+                      "slated for removal in Python 3.12", DeprecationWarning)
+        # The exception will cause ModuleType.__repr__ to ignore this method.
+        raise NotImplementedError
diff --git a/Lib/importlib/_adapters.py b/Lib/importlib/_adapters.py
@@ -0,0 +1,83 @@
+from contextlib import suppress
+
+from . import abc
+
+
+class SpecLoaderAdapter:
+    """
+    Adapt a package spec to adapt the underlying loader.
+    """
+
+    def __init__(self, spec, adapter=lambda spec: spec.loader):
+        self.spec = spec
+        self.loader = adapter(spec)
+
+    def __getattr__(self, name):
+        return getattr(self.spec, name)
+
+
+class TraversableResourcesLoader:
+    """
+    Adapt a loader to provide TraversableResources.
+    """
+
+    def __init__(self, spec):
+        self.spec = spec
+
+    def get_resource_reader(self, name):
+        return DegenerateFiles(self.spec)._native()
+
+
+class DegenerateFiles:
+    """
+    Adapter for an existing or non-existant resource reader
+    to provide a degenerate .files().
+    """
+
+    class Path(abc.Traversable):
+        def iterdir(self):
+            return iter(())
+
+        def is_dir(self):
+            return False
+
+        is_file = exists = is_dir  # type: ignore
+
+        def joinpath(self, other):
+            return DegenerateFiles.Path()
+
+        @property
+        def name(self):
+            return ''
+
+        def open(self, mode='rb', *args, **kwargs):
+            raise ValueError()
+
+    def __init__(self, spec):
+        self.spec = spec
+
+    @property
+    def _reader(self):
+        with suppress(AttributeError):
+            return self.spec.loader.get_resource_reader(self.spec.name)
+
+    def _native(self):
+        """
+        Return the native reader if it supports files().
+        """
+        reader = self._reader
+        return reader if hasattr(reader, 'files') else self
+
+    def __getattr__(self, attr):
+        return getattr(self._reader, attr)
+
+    def files(self):
+        return DegenerateFiles.Path()
+
+
+def wrap_spec(package):
+    """
+    Construct a package spec with traversable compatibility
+    on the spec/loader/reader.
+    """
+    return SpecLoaderAdapter(package.__spec__, TraversableResourcesLoader)