Subprocess: Need Help Sending Errors, and Output to the Log File

[jool]

I have this code:

cmd_output =subprocess.Popen([cmd], shell=True,stdout=subprocess.PIPE,stderr=subprocess.PIPE).communicate()
                    log.debug(cmd))

I have a logger defined, and all the logs goes to the file. Now, what I want to do is, log output and error of subprocess to this log_file. Also I can you tell what does it do, when you set stderr=subprocess.PIPE and stdout=subprocess.PIPE, and where does the log get output and errors get written?

[bartonc]

Logging messages are subjected to a dispatch mechanism through the use of handlers, which are instances of subclasses of the Handler class. Handlers are responsible for ensuring that a logged message (in the form of a LogRecord) ends up in a particular location (or set of locations) which is useful for the target audience for that message (such as end users, support desk staff, system administrators, developers). Handlers are passed LogRecord instances intended for particular destinations. Each logger can have zero, one or more handlers associated with it (via the addHandler() method of Logger). In addition to any handlers directly associated with a logger, all handlers associated with all ancestors of the logger are called to dispatch the message.

Sounds like you need to write the handler; maybe there are default handlers to write files for you.

[jool]

Sounds like you need to write the handler; maybe there are default handlers to write files for you.

I did setup a handler in a method called LogSetup:

def LogSetup():
    log = logging.getLogger("sitelogs")
    fmt = logging.Formatter('%(name)-12s: %(levelname)-8s %(message)s')
 
    log.setLevel(logging.DEBUG)
    fhnd = logging.FileHandler('logs.log', 'a')
    fhnd.setLevel(logging.DEBUG)
    fhnd.setFormatter(fmt)
    log.addHandler(fhnd)

My question how would I use this with subprocess ?