On Tue, 2004-07-13 at 11:26, Sergio Trejo wrote:

I have a few legacy simple Python modules that run on a machine that doesn't give me access to a crontab (I know, this sounds kind of dumb but unfortunately this is the policy of this a shared account that I have no choice but to use). With these legacy modules I have to run two (extrnal, non-Python) programs periodically (thus, similar to a cron) and also sequentially (I.e., when program A finishes, run program B) and thus blocking is required. To do this I've been using Python's popen3() -- and it has worked fine. There is an old saying: "If it ain't broke, don't fix it." However, I'm tempted to re-think these modules by perhaps using the Twisted reactor because it has all of these other nice benefits such as provisioning daemonization.

I realize that Twisted's core strength is for network programming of asynchronous non-blocking apps and perhaps I might be better off sticking with my popen's instead? Any suggestions from the Twisted veterans?

You can spawn processes via the reactor. See http://twistedmatrix.com/documents/current/howto/process for details. Cheers, Matt -- __ / \__ Matt Goodall, Pollenation Internet Ltd \__/ \ w: http://www.pollenation.net __/ \__/ e: matt@pollenation.net / \__/ \ t: +44 (0)113 2252500 \__/ \__/ / \ Any views expressed are my own and do not necessarily \__/ reflect the views of my employer.

On Tue, 2004-07-13 at 11:26, Sergio Trejo wrote:

I have a few legacy simple Python modules that run on a machine that doesn't give me access to a crontab (I know, this sounds kind of dumb but unfortunately this is the policy of this a shared account that I have no choice but to use). With these legacy modules I have to run two (extrnal, non-Python) programs periodically (thus, similar to a cron) and also sequentially (I.e., when program A finishes, run program B) and thus blocking is required. To do this I've been using Python's popen3() -- and it has worked fine. There is an old saying: "If it ain't broke, don't fix it." However, I'm tempted to re-think these modules by perhaps using the Twisted reactor because it has all of these other nice benefits such as provisioning daemonization.

I realize that Twisted's core strength is for network programming of asynchronous non-blocking apps and perhaps I might be better off sticking with my popen's instead? Any suggestions from the Twisted veterans?

You can spawn processes via the reactor. See http://twistedmatrix.com/documents/current/howto/process for details. Cheers, Matt -- __ / \__ Matt Goodall, Pollenation Internet Ltd \__/ \ w: http://www.pollenation.net __/ \__/ e: matt@pollenation.net / \__/ \ t: +44 (0)113 2252500 \__/ \__/ / \ Any views expressed are my own and do not necessarily \__/ reflect the views of my employer.