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Pulling up a different canvas depending on the variable

edited October 2016 in OpenSesame

Hi All,

I am trying to set the canvas "my_target_canvas" to pull up a different canvas depending on what the variable "target_pic" is. I've tried doing this below, but I'm getting an error when it tries to run through the code. All of the sketchpads have been created elsewhere and are being called up by name in the code. Can you see something that might be a problem here or have suggestions for fixing?

Comments

  • from openexp.canvas import canvas
    from openexp.keyboard import keyboard
    
    #settings
    timeout1  = var.tar_present_time #target presentation duration
    timeout2  = var.keyboard2_time #fixation canvas duration
    
    timeout = timeout1 + timeout2
    ready_for_break = False
    #create keyboard
    my_keyboard = keyboard(exp,keylist=['l','k'])
    
    # initialize important variables
    var.response_time = 0
    var.correct = 0
    var.resp = None
    
    #choose stimulus for target
    my_target_canvas = canvas(exp)
    var.target_sketchpad = str.show ("target_var.target_pic")
    if var.target_sketchpad == str.show ("target_var.target_pic"):
        my_target_canvas = ("target_var.target_pic")
    
    #create while loop for what should show when target is present for target present trials
    if var.Tar_present == 'yes':
        t0 = my_target_canvas.show()
        while clock.time()-t0 < timeout:
            if clock.time()-t0 > timeout1: 
                my_fix_canvas.show()
            if not ready_for_break:
                var.resp, time = my_keyboard.get_key(timeout=10) # a very small value is enough
                var.response = var.resp
                if var.resp != None:
                    ready_for_break = True
                    if var.resp == var.Correct_resp:
                        var.correct = 1
                    else:
                        var.correct=0
                    var.response_time = time-t0
                if var.resp == None:
                    var.response_time = time - t0
    
    #create while loop for same duration but only fixation screen for catch trials              
    if var.Tar_present == 'no':
        t0 = my_fix_canvas.show()
        while clock.time()-t0 < timeout:
            if not ready_for_break:
                var.resp, time = my_keyboard.get_key(timeout=10) # a very small value is enough
                var.response = var.resp
                if var.resp != None:
                    ready_for_break = True
                    var.response_time = time-t0
                if var.resp == None:
                    var.correct = 1
                else:
                    var.correct = 0
    
    # Maintain feedback variables. This ensures that
    # you can use the feedback item as usual
    var.total_responses = (var.total_responses + 1)
    if var.correct:
        var.total_correct = (var.correct +1)
    var.total_response_time = (var.total_response_time + var.response_time)
    var.acc = 100. * var.total_correct / var.total_responses
    var.avg_rt = var.total_response_time / var.total_responses
    var.accuracy =var.acc
    var.average_response_time =var.avg_rt
    
  • Traceback:
      File "C:\Program Files\OpenSesame\lib\site-packages\libopensesame\inline_script.py", line 102, in run
        self.experiment.python_workspace._exec(self.crun)
      File "C:\Program Files\OpenSesame\lib\site-packages\libopensesame\python_workspace.py", line 161, in _exec
        exec(bytecode, self._globals)
      File "<string>", line 21, in <module>
    AttributeError: type object 'str' has no attribute 'show'
    
  • Hi,

    A line like this:

    var.target_sketchpad = str.show ("target_var.target_pic")
    

    … in an otherwise reasonable script, suggests that you're trying to modify a script that you got from someone else, but that you don't actually know any Python. Am I correct?

    If so, then it's probably best to start by taking a step back, and first learning some basic Python:

    This won't take long--you don't need more than the basics. But then we have some common ground to talk about what you actually want to do here, and why it doesn't work. If we try this now, I think we'll just miscommunicate. What do you say?

    Cheers,
    Sebastiaan

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