Problems on select module on Python 2.5

Question

I have an application in Python 2.5 that listens to a beanstalk queue. It works fine on all machines I tested so far, except from my newly acquired MacBook Pro.

On that computer, when I try to run it I get this error:

Traceback (most recent call last):
  File "jobs.py", line 181, in <module>
    Jobs().start()
  File "jobs.py", line 154, in start
    self.jobQueue = Queue()
  File "src/utils/queue.py", line 16, in __init__
    self.connection = serverconn.ServerConn(self.server, self.port)
  File "src/beanstalk/serverconn.py", line 25, in __init__
    self.poller = select.poll()
AttributeError: 'module' object has no attribute 'poll'

The serverconn.py has the following imports:

import socket, select

And when I try to run it from command line, it fails as well:

Python 2.5.1 (r251:54863, Jul 23 2008, 11:00:16) 
[GCC 4.0.1 (Apple Inc. build 5465)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import select
>>> select.poll()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute 'poll'

Do you have any idea on what can be happening?

PS: Even though I am pretty confident it's not a source problem, if you need some background on the source that's failing, it's available at http://pastie.org/399342.

Updated: since the first answer I got speculates whether select.poll() is or not supported on Mac OS, but I have an iMac too and with the exact same OS version and it works fine:

2009-02-25 00:27:10,067 - Queue - DEBUG - Connecting to BeansTalk daemon @ localhost:11300

Answer 1

select.poll()

(Not supported by all operating systems.) Returns a polling object, which supports registering and unregistering file descriptors, and then polling them for I/O events; see section Polling Objects below for the methods supported by polling objects.

My guess is that it's not supported on the macOS.

Answer 2

I think your answer is here

http://atomized.org/2008/12/python-on-os-x-leopard-lacks-selectpoll/

Answer 3

use the MacPorts version of python on your MBP.

Mac OS X supports this. Apple stock Leopard python 2.5.1 does not.

you will want to download and install MacPorts if you have not already. FYI, I find Porticus to be an excellent GUI around MacPorts.

here is a comparison of stock Leopard python vs. latest MacPorts python2.5...

---

Leopard python from Apple (python 2.5.1) - select.poll() broken

$ /usr/bin/python
Python 2.5.1 (r251:54863, Jan 13 2009, 10:26:13) 
[GCC 4.0.1 (Apple Inc. build 5465)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import socket, select
>>> select.poll()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute 'poll'
>>>

Macports (python 2.5.4) - select.poll() works!

$ /opt/local/bin/python2.5
Python 2.5.4 (r254:67916, Feb  3 2009, 21:40:31) 
[GCC 4.0.1 (Apple Inc. build 5488)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import socket, select
>>> select.poll()
<select.poll object at 0x11128>
>>>