key ="agpoZWxsb3dvcmxkcgsLEgRCbG9nGPckDA"
r = db.get(key)
is OK.But...
Google\google_appengine\google\appengine\ext\admin\__init__.py", line 542, in input_field
if len(sample_value) > 255 or sample_value.find('\n') >= 0:
TypeError: object of type 'NoneType' has no len()
Odd behaviour in admin interface
http://groups.google.com/group/google-appengine/browse_thread/thread/29cd28daea3c37d3?fwc=1