[bloggerDev] retrieve blog posts with filter using python gdata client

I have this code:

class Blog(webapp.RequestHandler):
def __init__(self):
categories = ["lang:cs", "news"]
self.client = gdata.blogger.client.BloggerClient()
self.query = gdata.blogger.client.Query(categories=categories,
max_results=10, strict=True, order_by="updated")
def get(self):
feed = self.client.GetPosts(blog_id="7297489546734971425",
query=self.query)
for entry in feed.entry:
print entry.title.text.encode("utf-8")

But it fails to retrieve posts with this error:

Traceback (most recent call last):
File "/Applications/GoogleAppEngineLauncher.app/Contents/Resources/
GoogleAppEngine-default.bundle/Contents/Resources/google_appengine/
google/appengine/ext/webapp/__init__.py", line 511, in __call__
handler.get(*groups)
File "/Users/ondruska/Documents/tenant-check/gd.py", line 36, in get
feed = self.client.GetPosts(blog_id="7297489546734971425",
query=self.query)
File "/Users/ondruska/Documents/tenant-check/gdata/blogger/
client.py", line 65, in get_posts
desired_class=desired_class, query=query, **kwargs)
File "/Users/ondruska/Documents/tenant-check/gdata/client.py", line
635, in get_feed
**kwargs)
File "/Users/ondruska/Documents/tenant-check/gdata/client.py", line
320, in request
RequestError)
RequestError: Server responded with: 400, Invalid query
parameters:categories

This is using gdata python client 2.0.12. Similar code in Java with
gdata java client works fine. Anybody having similar problems?

Thanks,

Peter

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