API retrieval of Blog labels / tags

I have been writing some Python code to retrieve historical blogger posts 
from my own.
I seem to be able to get the blog post title, the url, the id and so 
forth... but how do I get the labels/tags that are associated with the post.
I am using the Blogger API client libraries

request = posts.get(blogId=blog['id'],postId=post['id'])
post_content = request.execute()
print('Author:  %s:' % post_content['author'])
print('Content: %s:' % post_content['content'])
print('Replies: %s:' % post_content['replies'])


The Blogger API documentation 
<https://developers.google.com/resources/api-libraries/documentation/blogger/v3/python/latest/blogger_v3.posts.html#get>
 references:

 "labels": [ # The list of labels this Post was tagged with."A String",],


but a call with that seems to go unrecognised.

Any advice or help?

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