[Jython-users] overriding import

[Russo, T. <to...@st...>]

Hi all,

I'm trying to augment the functionality of import so it will try to load
modules out of a database if it doesn't find them on the search path.  So,
before anything else, I want to mimic the regular import:

<file name="simple_import.py">
import imp, __builtin__

original_import = __builtin__.__import__

def import_hook(name, globals=None, locals=None, fromlist=None):
	return original_import(name, globals, locals, fromlist)		#
this is where the error occurs

# Install our modified import function.
__builtin__.__import__ = import_hook
</file>

When I run the following in cpython, everything works fine:

>>> import simple_import
>>> import urllib

However, when I run the same commands with jython2.1 I get:
<output>
Traceback (innermost last):
  File "ex.py", line 2, in ?
  File
"C:\cygwin\home\Administrator\Discovery\verification\python\shared\simple_im
port.py", line 6, in import_hook
  File "C:\jython21\Lib\urllib.py", line 85, in ?
  File "C:\jython21\Lib\urllib.py", line 321, in URLopener
  File
"C:\cygwin\home\Administrator\Discovery\verification\python\shared\simple_im
port.py", line 6, in import_hook
UnboundLocalError: local: 'globals'
</output>

which seems strange since globals is one of import_hook's formal parameters.
I haven't been able to find this as a documented difference between cpython
and jython-- is it?  If not, does anyone know how I can fix this?

thanks
_t