Why doesn't this work?

from steem import Steem
steemd = Steem(nodes=['https://api.steemit.com']).steemd
for post in steemd.stream_comments():
    print(post)

When this works:

steemd.get_dynamic_global_properties()

You said steem-python would work right away, but there are many people complaining here that it doesn't.