HI all, In my quest to figure out how Zope works, I'm starting with ExtrenalMethods. I've moved slashdot.py into Extensions and set up an external method (id: get_headlines, funstion name: get_headlines, python module: slashdot). My 'calling' DTML is a method (slashdot_headlines) with the following; <!--#call get_headlines--> <!--#in headlines mapping--> <p> <a href="<!--#var href-->"><!--#var title--></a> </p> <!--#/in--> trying 'view' on this method gives the following; <!-- Error type: Error value: read-only buffer, class --> ... <!-- Traceback (innermost last): File lib/python/ZPublisher/Publish.py, line 877, in publish_module File lib/python/ZPublisher/Publish.py, line 590, in publish (Info: /wip/slashdot_headlines) File lib/python/OFS/DTMLMethod.py, line 155, in __call__ (Object: slashdot_headlines) File lib/python/OFS/DTMLMethod.py, line 151, in __call__ (Object: slashdot_headlines) File lib/python/DocumentTemplate/DT_String.py, line 513, in __call__ (Object: slashdot_headlines) File lib/python/Products/ExternalMethod/ExternalMethod.py, line 254, in __call__ (Object: CopySource) (Info: ((), {}, ('headlines', 'headlines_date', 60))) TypeError: (see above) --> I *did* have a problem with using a proxy, but got around that by adding this line to slashdot.py (just before the urllib.urlopen() call). urllib.URLopener(proxies={'http': 'http://cache-box.you.domain:your_port'}) What am I doing wrong? many thanks tone ------ Dr Tony McDonald, FMCC, Networked Learning Environments Project The Medical School, Newcastle University Tel: +44 191 222 5888 Fingerprint: 3450 876D FA41 B926 D3DD F8C3 F2D0 C3B9 8B38 18A2