Get Queue Size in Pika (AMQP Python)

I know that this question is a bit old, but here is an example of doing this with pika.

Regarding AMQP and RabbitMQ, if you have already declared the queue, you can re-declare the queue with the passive flag on and keeping all other queue parameters identical. The response to this declaration declare-ok will include the number of messages in the queue.

Here is an example With pika 0.9.5:

import pika

def on_callback(msg):
    print msg

params = pika.ConnectionParameters(
        host="localhost",
        port=5672,
        credentials=pika.credentials.PlainCredentials('guest', 'guest'),
    )

# Open a connection to RabbitMQ on localhost using all default parameters
connection = pika.BlockingConnection(parameters=params)

# Open the channel
channel = connection.channel()

# Declare the queue
channel.queue_declare(
        callback=on_callback,
        queue="test",
        durable=True,
        exclusive=False,
        auto_delete=False
    )

# ...

# Re-declare the queue with passive flag
res = channel.queue_declare(
        callback=on_callback,
        queue="test",
        durable=True,
        exclusive=False,
        auto_delete=False,
        passive=True
    )
print 'Messages in queue %d' % res.method.message_count

This will print the following:

<Method(['frame_type=1', 'channel_number=1', "method=<Queue.DeclareOk(['queue=test', 'message_count=0', 'consumer_count=0'])>"])>
<Method(['frame_type=1', 'channel_number=1', "method=<Queue.DeclareOk(['queue=test', 'message_count=0', 'consumer_count=0'])>"])>
Messages in queue 0

You get the number of messages from the message_count member.