[solved] logging multiple sessions

Comments

• sebastiaan

  January 2014 edited 6:48AM

  Hi Paolo,

  You can achieve this by closing the default logfile at the start of the experiment, providing a new name, and reopening the logfile. Of course, to determine the new name for the logfile, you need to use some logic to see which session-number logfile does not yet exist for that particular subject number.

  It's a bit tricky, and requires some inline scripting. But the script below should get you started:

  import os
  # Close the current logfile
  exp._log.close()
  # Check for each session number whether a file called
  # `[subject nr]-[session nr].csv` already exists, and pick the first session
  # number which does *not* exist.
  for session_nr in range(0, 1000):
      path = '%d-%d.csv' % (self.get('subject_nr'), session_nr)
      if not os.path.exists(path):
          break
  print 'Using %s' % path
  exp.logfile = path
  # Reopen the logfile
  exp._log = None
  exp.init_log()
  

  Cheers,
  Sebastiaan

  
  
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• pamongi

  January 2014 edited 6:48AM

  excellent - thank you so much! the script does exactly what I want. The one thing it does not do, however, is to log the session_nr ... should I declare the variable somewhere for it to be logged?
  thanks - Paolo
• lvanderlinden

  January 2014 edited 6:48AM

  Hi,

  should I declare the variable somewhere for it to be logged

  Yes! In order to make in-an-inline-script-defined variables available in the GUI (e.g. the logger item) as well, you should set them at the end of you inline script by using the exp.set() function. For example:

  exp.set("session_nr", session_nr)
  

  For more information, see:

  • http://osdoc.cogsci.nl/usage/variables-and-conditional-statements/#gettingandsettingvariablesininline_scriptitems
  • http://osdoc.cogsci.nl/python/experiment/#experiment.set

  Does that help?

  Best,

  Lotje

  Did you like my answer? Feel free to
• pamongi

  January 2014 edited 6:48AM

  awesome thank you!
• joff

  June 2016 edited 6:48AM

  Hi there,

  I'm new to OpenSesame and Python - I tried using the above script to automatically set the session number, which is then saved as the file name. I tried entering it into the main script and it was removed once I clicked apply, and when I put it in a python inline script at the start of my experiment in the GUI, it didn't run. Am I missing something simple?

  Ideally, I would like to use this with opensesamerun. Would that be possible?

  Many thanks,
  Joff
• sebastiaan

  June 2016 edited 6:48AM

  and when I put it in a python inline script at the start of my experiment in the GUI, it didn't run. Am I missing something simple?

  Yes, you (or rather we) are missing the actual error message that you get when the experiment doesn't run!

  
  
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• joff

  June 2016 edited 6:48AM

  Hi Sebastian,

  Thanks for getting back to me. There was no error message, the experiment runs but it is as if the inline code is ignored.

  Thanks,
  Joff
• joff

  July 2016 edited 6:48AM

  Hi there,

  I am trying to use this script with OS 3, but I receive the error " 'str' object has no attribute 'var' ". I think the problem is with the initiate logfile function. Any help would be greatly appreciated!

  import os
  
  # Close the current logfile
  log.close()
  
  # Check for each session number whether a file called
  # `[subject nr]-[session nr].csv` already exists, and pick the first session
  # number which does *not* exist.
  var.session_nr='session_nr'
  for session_nr in range(0, 1000):
      path = '%d-%d.csv' % (var.subject_nr, session_nr)
      if not os.path.exists(path):
          break
  print('Using %s' % path)
  
  # Initiate new log file and open
  log.__init__('practice_experiment.osexp', path)
  log.open(path)
  

  Many thanks,
  Joff
• sebastiaan

  July 2016 edited 6:48AM

  Hi Joff,

  You don't need to call log.__init__(). Essentially, in Python you never (or very rarely) call _init__() functions. Those are constructors that are called automatically when an object is created, and OpenSesame has already created log for you. So in this case, simply calling log.open() will be enough to close the current logfile, and open a new one.

  Cheers!
  Sebastiaan

  
  
  Check out SigmundAI.eu for our OpenSesame AI assistant!
  
• joff

  July 2016 edited 6:48AM

  Great, that's working now. Thanks very much!