Print elsewhere than stdout and stderr

Question

Currently, I can print information to stdout and also to stderr, but I would like to print information about progress and print it to stdout, stderr and somewhere else. Is this possible?

Are you saying that you want to simulataneously print output to stdout, stderr, and somewhere else? — Joel Cornett
– Joel Cornett, Commented Aug 26, 2012 at 16:30

Blender · Accepted Answer · 2012-08-26 16:35:46Z

3

You can use the logging module to log information simultaneously to different places:

import logging logger = logging.getLogger('your_logger') logger.setLevel(logging.INFO) file_handler = logging.FileHandler('errors.log') file_handler.setLevel(logging.ERROR) logger.addHandler(file_handler) stream_handler = logging.StreamHandler() stream_handler.setLevel(logging.INFO) logger.addHandler(stream_handler) logger.warning('I am a warning') logger.error('I will be printed, but written to the log file as well') logger.info('I am an info message')

edited Aug 26, 2012 at 16:35

answered Aug 26, 2012 at 16:24

Blender

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5 Comments

Levon Over a year ago

I am not that familiar with the logging module, isn't the output to the console (if there is any) delivered via stderr or stdout? (I need to read up on that module)

Andrew Over a year ago

when I redirect stderr to the file, that redirect logger messages too

Blender Over a year ago

@Levon: I think that depends on the severity of the message.

Blender Over a year ago

@Andrew: Can you explain a bit more?

Levon Over a year ago

@Blender I guess my question is geared towards OP wanting to display messages to the console in addition to using stderr and stdout .. I don't think that's possible (ie stdout and stderr will always be involved for display to the console). OP can display simultaneously to a number of "places" (incl files), but only stderr/stdout go to term unless I'm mistaken.

Levon · Accepted Answer · 2012-08-26 16:29:35Z

Output to the console comes only via stdout and stderr as far as I know.

Do you want to print to a file, then you can do this

 with open('outfile.txt', 'w') as f: f.write('this is a test')

or alternatively if you prefer using print:

 print >> f, 'this is a test'

In the above example a file named outfile.txt is opened for write access. This means any data already present will be wiped out by new data written to it. If you wanted to append you'd open the file in a mode. See the documentation for open() for more information.

Files that are opened need to be closed, using the with construct takes care of that for you (and also closes the file in case you encounter an exception).

Cause I wanna print progress information - it should be print to the term.
@Andrew Output to the console comes only via stdout and stderr as far as I know. If not, then I'll be happy to learn something new.
printing directly to /dev/console on a unix-like machine will probably work, although it's not necessarily a good idea.

unddoch · Accepted Answer · 2012-08-26 16:21:41Z

-1

Make a class with method named write(), then you can use

print 'text' >> Printer()

to print 'text' to the Printer() object (python 2.x) or

print('text', file=Printer())

in python 3.x

answered Aug 26, 2012 at 16:21

unddoch

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2 Comments

unddoch Over a year ago

any string you'd like to print, just replace 'text' with it

Joel Cornett Over a year ago

@pythonm: I would suggest subclassing StringIO (which already has a write method).

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