[Python-checkins] cpython (3.3): - Issue #16514: Fix regression causing a traceback when sys.path[0] is None
barry.warsaw
python-checkins at python.org
Tue Nov 20 21:35:38 CET 2012
http://hg.python.org/cpython/rev/291406748217
changeset: 80529:291406748217
branch: 3.3
parent: 80527:4537dd27b2dc
user: Barry Warsaw <barry at python.org>
date: Tue Nov 20 15:22:51 2012 -0500
summary:
- Issue #16514: Fix regression causing a traceback when sys.path[0] is None
(actually, any non-string or non-bytes type).
files:
Doc/library/sys.rst | 4 +-
Doc/reference/import.rst | 24 +-
Lib/importlib/_bootstrap.py | 2 +
Lib/test/test_importlib/import_/test_path.py | 25 +-
Misc/NEWS | 3 +
Python/importlib.h | 130 +++++----
6 files changed, 111 insertions(+), 77 deletions(-)
diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
--- a/Doc/library/sys.rst
+++ b/Doc/library/sys.rst
@@ -783,7 +783,9 @@
current directory first. Notice that the script directory is inserted *before*
the entries inserted as a result of :envvar:`PYTHONPATH`.
- A program is free to modify this list for its own purposes.
+ A program is free to modify this list for its own purposes. Only strings
+ and bytes should be added to :data:`sys.path`; all other data types are
+ ignored during import.
.. seealso::
diff --git a/Doc/reference/import.rst b/Doc/reference/import.rst
--- a/Doc/reference/import.rst
+++ b/Doc/reference/import.rst
@@ -540,7 +540,10 @@
implementation-specific defaults. Entries in :data:`sys.path` can name
directories on the file system, zip files, and potentially other "locations"
(see the :mod:`site` module) that should be searched for modules, such as
-URLs, or database queries.
+URLs, or database queries. Only strings and bytes should be present on
+:data:`sys.path`; all other data types are ignored. The encoding of bytes
+entries is determined by the individual :term:`path entry finders <path entry
+finder>`.
The :term:`path based finder` is a :term:`meta path finder`, so the import
machinery begins the :term:`import path` search by calling the path
@@ -563,14 +566,17 @@
the path based finder to perform the path entry search again [#fnpic]_.
If the path entry is not present in the cache, the path based finder iterates
-over every callable in :data:`sys.path_hooks`. Each of the
-:term:`path entry hooks <path entry hook>` in this list is called with a
-single argument, the path entry to be searched. This callable may either
-return a :term:`path entry finder` that can handle the path entry, or it may
-raise :exc:`ImportError`.
-An :exc:`ImportError` is used by the path based finder to signal that the hook
-cannot find a :term:`path entry finder` for that :term:`path entry`. The
-exception is ignored and :term:`import path` iteration continues.
+over every callable in :data:`sys.path_hooks`. Each of the :term:`path entry
+hooks <path entry hook>` in this list is called with a single argument, the
+path entry to be searched. This callable may either return a :term:`path
+entry finder` that can handle the path entry, or it may raise
+:exc:`ImportError`. An :exc:`ImportError` is used by the path based finder to
+signal that the hook cannot find a :term:`path entry finder` for that
+:term:`path entry`. The exception is ignored and :term:`import path`
+iteration continues. The hook should expect either a string or bytes object;
+the encoding of bytes objects is up to the hook (e.g. it may be a file system
+encoding, UTF-8, or something else), and if the hook cannot decode the
+argument, it should raise :exc:`ImportError`.
If :data:`sys.path_hooks` iteration ends with no :term:`path entry finder`
being returned, then the path based finder's :meth:`find_module()` method
diff --git a/Lib/importlib/_bootstrap.py b/Lib/importlib/_bootstrap.py
--- a/Lib/importlib/_bootstrap.py
+++ b/Lib/importlib/_bootstrap.py
@@ -1281,6 +1281,8 @@
# the list of paths that will become its __path__
namespace_path = []
for entry in path:
+ if not isinstance(entry, (str, bytes)):
+ continue
finder = cls._path_importer_cache(entry)
if finder is not None:
if hasattr(finder, 'find_loader'):
diff --git a/Lib/test/test_importlib/import_/test_path.py b/Lib/test/test_importlib/import_/test_path.py
--- a/Lib/test/test_importlib/import_/test_path.py
+++ b/Lib/test/test_importlib/import_/test_path.py
@@ -1,15 +1,14 @@
from importlib import _bootstrap
from importlib import machinery
+from importlib import import_module
from .. import util
from . import util as import_util
-import imp
import os
import sys
-import tempfile
-from test import support
-from types import MethodType
+from types import ModuleType
import unittest
import warnings
+import zipimport
class FinderTests(unittest.TestCase):
@@ -89,6 +88,24 @@
self.assertIs(loader, importer)
self.assertIn(os.curdir, sys.path_importer_cache)
+ def test_None_on_sys_path(self):
+ # Putting None in sys.path[0] caused an import regression from Python
+ # 3.2: http://bugs.python.org/issue16514
+ new_path = sys.path[:]
+ new_path.insert(0, None)
+ new_path_importer_cache = sys.path_importer_cache.copy()
+ new_path_importer_cache.pop(None, None)
+ new_path_hooks = [zipimport.zipimporter,
+ _bootstrap.FileFinder.path_hook(
+ *_bootstrap._get_supported_file_loaders())]
+ with util.uncache('email'):
+ with util.import_state(meta_path=sys.meta_path[:],
+ path=new_path,
+ path_importer_cache=new_path_importer_cache,
+ path_hooks=new_path_hooks):
+ module = import_module('email')
+ self.assertIsInstance(module, ModuleType)
+
def test_main():
from test.support import run_unittest
diff --git a/Misc/NEWS b/Misc/NEWS
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,9 @@
Core and Builtins
-----------------
+- Issue #16514: Fix regression causing a traceback when sys.path[0] is None
+ (actually, any non-string or non-bytes type).
+
- Issue #16306: Fix multiple error messages when unknown command line
parameters where passed to the interpreter. Patch by Hieu Nguyen.
diff --git a/Python/importlib.h b/Python/importlib.h
--- a/Python/importlib.h
+++ b/Python/importlib.h
[stripped]
--
Repository URL: http://hg.python.org/cpython
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