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I really like the "_exec_module" trick, but it should be applied to builtin modules as well. I hacked _sre.c and got:
~/python/cpython3.x$ ./python 
Traceback (most recent call last):
 File "/home/amauryfa/python/cpython3.x/Lib/site.py", line 70, in <module>
 import re
 File "/home/amauryfa/python/cpython3.x/Lib/re.py", line 122, in <module>
 import sre_compile
 File "/home/amauryfa/python/cpython3.x/Lib/sre_compile.py", line 13, in <module>
 import _sre, sys
 File "<frozen importlib._bootstrap>", line 1318, in _find_and_load
 File "<frozen importlib._bootstrap>", line 1285, in _find_and_load_unlocked
 File "<frozen importlib._bootstrap>", line 347, in set_package_wrapper
 File "<frozen importlib._bootstrap>", line 360, in set_loader_wrapper
 File "<frozen importlib._bootstrap>", line 443, in _requires_builtin_wrapper
 File "<frozen importlib._bootstrap>", line 493, in load_module
ValueError: Just a test
This change correctly hides importlib frames:
diff -r 9afdd8c25bf2 Lib/importlib/_bootstrap.py
--- a/Lib/importlib/_bootstrap.py	Sun Jul 08 14:00:06 2012 +0200
+++ b/Lib/importlib/_bootstrap.py	Sun Jul 08 15:03:27 2012 +0200
@@ -490,12 +490,15 @@
 """Load a built-in module."""
 is_reload = fullname in sys.modules
 try:
- return _imp.init_builtin(fullname)
+ return self._exec_module(fullname)
 except:
 if not is_reload and fullname in sys.modules:
 del sys.modules[fullname]
 raise
 
+ def _exec_module(self, fullname):
+ return _imp.init_builtin(fullname)
+
 @classmethod
 @_requires_builtin
 def get_code(cls, fullname):