Adam Sherman » Python

Developer Position Open at Versature

adam — Mon, 05 Dec 2011 21:11:03 +0000

We’re hiring again at Versature, take a look:

It’s a software developer position that gets you working directly with me. Make sure to spread the word!

NullPosts: suds and appengine

adam — Fri, 05 Aug 2011 00:01:32 +0000

I ran into the issue described in NullPosts: suds and appengine today. This is caused by the great Python SOAP API, suds, and Google App Engine not playing together to do some of the restrictions in GAE. Thanks NullPosts!

Google App Engine’s Python Exception Syntax

adam — Thu, 04 Aug 2011 19:39:46 +0000

Remember, Python 2.5 has this exception syntax:

try:
    raise FooException("Darn!")
except FooException, e
    print("Error: %s" % e)

The newer syntax is:

try:
    raise FooException("Darn!")
except FooException as e
    print("Error: %s" % e)

I ran into this when uploading an application to Google App Engine, which then produced this cryptic error:

: invalid syntax (main.py, line 64)

Where line 64 is the line containing the not-yet-implemented as keyword.

Mac OS X 10.7 “Lion” Seems to Have a Broken Python easy_install

adam — Mon, 25 Jul 2011 19:11:36 +0000

One of the first things I needed after upgrading to Mac OS X 10.7 (Lion) was to make some Python scripts work. However easy_install seemed to be broken:

$ easy_install psycopg2
Traceback (most recent call last):
  File "/usr/local/bin/easy_install", line 5, in 
    from pkg_resources import load_entry_point
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 2607, in 
    parse_requirements(requires), Environment()
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/pkg_resources.py", line 565, in resolve
    raise DistributionNotFound(req)  # XXX put more info here
pkg_resources.DistributionNotFound: setuptools==0.6c12dev-r88795

I fixed this by installing Distribute and then the new Mac OS X Developer Tools.

ReferenceField can not be searchable

adam — Tue, 05 Oct 2004 15:57:50 +0000

Under Archectypes 1.3 (final), I had a ReferenceField setup with searchable=True and this caused a TypeError when saving the object:

Traceback (innermost last):
  Module ZPublisher.Publish, line 100, in publish
  Module ZPublisher.mapply, line 88, in mapply
  Module ZPublisher.Publish, line 40, in call_object
  Module Products.CMFFormController.FSControllerPageTemplate, line 98, in __call__
  Module Products.CMFFormController.BaseControllerPageTemplate, line 39, in _call
  Module Products.CMFFormController.ControllerBase, line 191, in getNext
  Module Products.CMFFormController.Actions.TraverseTo, line 36, in __call__
  Module ZPublisher.mapply, line 88, in mapply
  Module ZPublisher.Publish, line 40, in call_object
  Module Products.CMFFormController.FSControllerPythonScript, line 105, in __call__
  Module Products.CMFFormController.Script, line 141, in __call__
  Module Products.CMFCore.FSPythonScript, line 104, in __call__
  Module Shared.DC.Scripts.Bindings, line 306, in __call__
  Module Shared.DC.Scripts.Bindings, line 343, in _bindAndExec
  Module Products.CMFCore.FSPythonScript, line 160, in _exec
  Module None, line 11, in content_edit
   - 
   - Line 11
  Module Products.Archetypes.BaseObject, line 573, in processForm
  Module Products.Archetypes.BaseObject, line 566, in _processForm
   - __traceback_info__: (, , >)
  Module Products.Archetypes.CatalogMultiplex, line 60, in reindexObject
  Module Products.CMFMember.CatalogTool, line 51, in catalog_object
  Module Products.ZCatalog.ZCatalog, line 513, in catalog_object
  Module Products.ZCatalog.Catalog, line 381, in catalogObject
  Module Products.ZCTextIndex.ZCTextIndex, line 163, in index_object
  Module Products.ZCTextIndex.ZCTextIndex, line 173, in _index_object
  Module Products.Archetypes.BaseObject, line 475, in SearchableText
  Module Products.Archetypes.BaseObject, line 475, in 
  Module Products.Archetypes.utils, line 276, in getValue
TypeError: DisplayList keys must be strings or ints, got

The only reference to this that I’ve found is on the list. Setting searchable=False avoids the issue. I do not know if this is an actual bug.

Neural Nets in Python

adam — Fri, 18 Jun 2004 12:50:13 +0000

Now I really need an excuse to play with this kind of thing. Weave a neural net with Python from IBM DeveloperWorks is very intriguing, now I need to understand it…