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[Eike Welk <eike.welk@xxxxxxx>]

I'm getting unexpected errors in a Python program that uses Launchpadlib.

When the program wants to change attributes of a bug, it must first read one 
attribute of the bug; otherwise the program fails with an exception from deep 
inside Launchpadlib. 

I suspect that I use Launchpadlib in an unintended way. What is the right way 
to change attributes in Launchpad? Is there an official way to prepare 
objects, so that their attributes can be changed?

Here is an example that illustrates the odd behavior:


from launchpadlib.launchpad import Launchpad
launchpad = Launchpad.login_with("bug-repo-syncer", "production")

lp_task = launchpad.load(
    'https://api.launchpad.net/1.0/bug-repo-syncer/+bug/934181')
lp_bug = lp_task.bug

#Un-commenting this makes the error go away.
#lp_bug = launchpad.load("https://api.launchpad.net/1.0/bugs/934181";)

#Un-commenting this makes the error go away too.
#lp_bug.title   

lp_bug.title = "Test bug"
lp_bug.description = "A bug for testing Launchpadlib."


#Fails with:
#Traceback (most recent call last):
#  File "lp_problem.py", line 8, in <module>
#    lp_bug.title = "Test bug"
#  File "/usr/local/lib/python2.7/
#site-packages/lazr/restfulclient/resource.py", line 692, in __setattr__
#    if not self.lp_has_parameter(name):
#  File "/usr/local/lib/python2.7/
#site-packages/lazr/restfulclient/resource.py", line 206, in lp_has_parameter
#    return self._get_external_param_name(param_name) is not None
#  File "/usr/local/lib/python2.7/
#site-packages/lazr/restfulclient/resource.py", line 349, in
# _get_external_param_name
#    if self._wadl_resource.get_parameter(name):
#  File "/usr/local/lib/python2.7/site-packages/wadllib/application.py", 
#line 452, in get_parameter
#    definition = self._find_representation_definition(media_type)
#  File "/usr/local/lib/python2.7/site-packages/wadllib/application.py", 
#line 564, in _find_representation_definition
#    "Resource is not bound to any representation, and no media "
#wadllib.application.NoBoundRepresentationError: Resource is not bound to any
# representation, and no media media type was specified.


Eike.