4.9.5. Publish to a Topic Exchange

To publish to a topic exchange, create a sender whose address is the exchange, then set the subject of the message to the routing key.
In the following example, messages are sent to the news topic exchange with routing keys that allow geography-based subscriptions by consumers:
Python
import sys
from qpid.messaging import *
conn = Connection("localhost:5672")
conn.open()
try:
  ssn = conn.session()
  txnews = ssn.sender("news; {create: always, node: {type: topic}}")
  msg = Message("News about Europe") 
  msg.subject = "europe.news"
  txnews.send(msg)
  msg = Message("News about the US")
  msg.subject = "usa.news"
  txnews.send(msg)
finally:
  conn.close()
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