Remove internal implementation of ImpImporter and ImpLoader as comments...

Remove internal implementation of ImpImporter and ImpLoader as comments indicate they're only required for Python 2.4.

pkg_resources.py

@@ -1701,81 +1701,7 @@ class EggMetadata(ZipProvider):
             self.module_path = importer.archive
         self._setup_prefix()
 
-
-class ImpWrapper:
-    """PEP 302 Importer that wraps Python's "normal" import algorithm"""
-
-    def __init__(self, path=None):
-        self.path = path
-
-    def find_module(self, fullname, path=None):
-        subname = fullname.split(".")[-1]
-        if subname != fullname and self.path is None:
-            return None
-        if self.path is None:
-            path = None
-        else:
-            path = [self.path]
-        try:
-            file, filename, etc = imp.find_module(subname, path)
-        except ImportError:
-            return None
-        return ImpLoader(file, filename, etc)
-
-
-class ImpLoader:
-    """PEP 302 Loader that wraps Python's "normal" import algorithm"""
-
-    def __init__(self, file, filename, etc):
-        self.file = file
-        self.filename = filename
-        self.etc = etc
-
-    def load_module(self, fullname):
-        try:
-            mod = imp.load_module(fullname, self.file, self.filename, self.etc)
-        finally:
-            if self.file: self.file.close()
-        # Note: we don't set __loader__ because we want the module to look
-        # normal; i.e. this is just a wrapper for standard import machinery
-        return mod
-
-
-def get_importer(path_item):
-    """Retrieve a PEP 302 "importer" for the given path item
-
-    If there is no importer, this returns a wrapper around the builtin import
-    machinery.  The returned importer is only cached if it was created by a
-    path hook.
-    """
-    try:
-        importer = sys.path_importer_cache[path_item]
-    except KeyError:
-        for hook in sys.path_hooks:
-            try:
-                importer = hook(path_item)
-            except ImportError:
-                pass
-            else:
-                break
-        else:
-            importer = None
-
-    sys.path_importer_cache.setdefault(path_item,importer)
-    if importer is None:
-        try:
-            importer = ImpWrapper(path_item)
-        except ImportError:
-            pass
-    return importer
-
-try:
-    from pkgutil import get_importer, ImpImporter
-except ImportError:
-    pass    # Python 2.3 or 2.4, use our own implementation
-else:
-    ImpWrapper = ImpImporter    # Python 2.5, use pkgutil's implementation
-    del ImpLoader, ImpImporter
+from pkgutil import get_importer, ImpImporter as ImpWrapper
 
 
 _declare_state('dict', _distribution_finders = {})