Quite a few fixes to make the library and test suite more robust when

cPickle cannot be imported.  This was necessary because my last mass
checkin broke cPickle and I don't feel like debugging it right now;
but it seems a good idea in general not to require cPickle when
pickle.py is also there.  A few unrelated fixes for issues while
debigging various test failures.

setup.py: disable building of cPickle until I've fixed it

Objects/...

  genobject.c: disallow raising string exceptions

Lib/...

  Cookie.py: fix doctest not to fail if cPickle is missing
  ctypes/macholib/dyld.py: fix relative imports
  sqlite3/__init__.py: fix relative import
  xml/dom/__init__.py: fix relative import

Lib/test/...

  regrtest.py: reduce list of skipped items on darwin

  test_generators.py: don't test string exceptions; test throw() errors
  test_traceback.py: don't test string exceptions

  pickletester.py: don't fail if cPickle is missing
  test_datetime.py: don't fail if cPickle is missing
  test_descr.py: don't fail if cPickle is missing (still some other failures)
  test_exceptions.py: don't fail if cPickle is missing
  test_re.py: don't fail if cPickle is missing

  test_array.py: use pickle, not cPickle
  test_bool.py: don't fail if cPickle is missing
  test_deque.py: use pickle, not cPickle
  test_logging.py: use pickle, not cPickle

1 files changed, 10 insertions, 2 deletions

diff --git a/Lib/test/test_datetime.py b/Lib/test/test_datetime.py
index 203bea1..4f765c1 100644
--- a/Lib/test/test_datetime.py
+++ b/Lib/test/test_datetime.py
@@ -5,8 +5,11 @@ See http://www.zope.org/Members/fdrake/DateTimeWiki/TestCases
 
 import sys
 import pickle
-import cPickle
 import unittest
+try:
+    import cPickle
+except ImportError:
+    cPickle = None
 
 from test import test_support
 
@@ -18,9 +21,14 @@ from datetime import date, datetime
 
 pickle_choices = [(pickler, unpickler, proto)
                   for pickler in pickle, cPickle
+                  if pickler is not None
                   for unpickler in pickle, cPickle
+                  if unpickler is not None
                   for proto in range(3)]
-assert len(pickle_choices) == 2*2*3
+if cPickle is None:
+    assert len(pickle_choices) == 3
+else:
+    assert len(pickle_choices) == 2*2*3
 
 # An arbitrary collection of objects of non-datetime types, for testing
 # mixed-type comparisons.