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The following short program work in python 2.5, but does die with a
SystemError in python2.6:
~/ cat t.py 
#! /usr/bin/env python
res = dict(__package__='foo')
exec "from os import path" in res
~/ python2.5 t.py 
~/ python2.6 t.py 
Traceback (most recent call last):
 File "t.py", line 4, in <module>
exec "from os import path" in res
 File "<string>", line 1, in <module>
SystemError: Parent module 'foo' not loaded
I think this has been introduced with svn revision 42649
(http://hgpy.de/py/trunk/rev/54c72e1678d68ebbf274)
Part of the diff reads:
 modules = PyImport_GetModuleDict();
 parent = PyDict_GetItemString(modules, buf);
 if (parent == NULL)
- parent = Py_None;
+ PyErr_Format(PyExc_SystemError,
+ "Parent module '%.200s' not loaded", buf);
 return parent;
 /* We expect, but can't guarantee, if parent != None, that: