Hi,
I need to run some code that uses the Twisted library from within web2py 
(listening to multicast events on the network, parsing the data and then 
inserting it into the web2pt DB for integration into a webapp).

I get the following error upon importing Twisted. In the interests 
of reproducibility, I added

from twisted.internet import reactor

to the first line of the default.py controller in the welcome app. This is 
enough to trigger the bug:

Traceback (most recent call last):
  File "/var/www/web2py/gluon/restricted.py", line 204, in restricted
    exec ccode in environment
  File "/var/www/web2py/applications/welcome/controllers/default.py" 
<https://ss-geospatial-hf/admin/default/edit/welcome/controllers/default.py>, 
line 1, in <module>
    from twisted.internet import reactor
  File "/var/www/web2py/gluon/custom_import.py", line 293, in __call__
    fromlist, level)
  File "/var/www/web2py/gluon/custom_import.py", line 78, in __call__
    level)
  File "/usr/lib/python2.7/dist-packages/twisted/internet/reactor.py", line 37, 
in <module>
    from twisted.internet import default
  File "/var/www/web2py/gluon/custom_import.py", line 271, in __call__
    globals.get("__file__", ""))
  File "/usr/lib/python2.7/posixpath.py", line 66, in join
    if b.startswith('/'):
AttributeError: 'NoneType' object has no attribute 'startswith'

Ubuntu 12.04, Python 2.7.3, Twisted 12.0, web2py 1.99.4


There's nothing wrong with my twisted install - running the code I want to run 
within the web2py context as a standalone script works fine.


Any help much appreciated.


Cheers,

Hugh.

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