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How to collect the age of a subject as a variable

when starting an experiment, I would like to enter subject ID, date of birth and current date and then have opensesame log the sub_ID and sub_age for every trial/response as a variable. Ideally I would like to log both age in days and years.

I found information on getting the days between dates in python ( but since I'm new to both OS and python, I'd like to learn from an example solution.

Thanks in advance!


  • Hi,

    I recommend to use text_input_forms. You can collect all kinds of information like that.

    The error message seems to be quite straightforward, it

    Good luck,


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  • edited May 2018

    Hi there, i was looking for the same thing.
    And probably it would help everyone if there was a python code (based on text_input_form) which is accessible to everyone. So everybody could just paste it into an inline_script and that's it.

    It should do the following:
    #1 ask for Birthdate in the format DD.MM.JJJJ
    #2 calculate diff between experiment_date and Birthday
    #3 log the exact age in years (with commas)

    Up to now i was not able to manage that.
    But maybe @eduard this is an easy thing to do? ;)


  • Thanks for this masterpiece

    I changed the code a little to get the exact age with Birthday.
    Here is the code for anyone who is interested ;)

    def my_form_validator():
        """Checks whether both the gender and age fields have been filled out"""
        #also checks for the number of characters
        return != u'no' and var.byear != u'' and var.bmonth != u'' and var.bday != u'' and len(str(var.byear))==4 and len(str(var.bmonth))==(1 or 2) and len(str(var.bday))==(1 or 2)
    def filter_digits(ch):
        """Allows only digit characters as input"""
        return ch in ['0','1','2','3','4','5','6','7','8','9','backspace']
    # Define all widgets
    button_ok = Button(text=u'Ok')
    #label_gender= Label(u'Your gender')
    checkbox_male = Checkbox(text=u'Male', group=u'gender', var=u'sex')
    checkbox_female = Checkbox(text=u'Female', group=u'gender', var=u'sex')
    label_age = Label(u'Please enter your birthday')
    label_year = Label(u'Year')
    label_month = Label(u'Month')
    label_day = Label(u'Day')
    # Specify a key filter so that only digits are accepted as text input
    input_year  = TextInput(stub=u'2018 …', var=u'byear',  key_filter=filter_digits) #actually a selection thing would be nice
    input_month = TextInput(stub=u'01 …',   var=u'bmonth', key_filter=filter_digits)
    input_day   = TextInput(stub=u'01 …',   var=u'bday',   key_filter=filter_digits)
    # Build the form. Specify a validator function to make sure that the form is
    # completed.
    my_form = Form( validator=my_form_validator, cols=3, rows=6, spacing=10, margins=(100, 100, 100, 100),  )
    #my_form.set_widget(label_gender, (0, 0))
    my_form.set_widget(checkbox_male, (1, 0))
    my_form.set_widget(checkbox_female, (2, 0))
    my_form.set_widget(label_age, (1, 1))
    my_form.set_widget(label_year, (0, 2))
    my_form.set_widget(input_year,  (1, 2), colspan=2)
    my_form.set_widget(label_month, (0, 3))
    my_form.set_widget(input_month, (1, 3), colspan=2)
    my_form.set_widget(label_day, (0, 4))
    my_form.set_widget(input_day,   (1, 4), colspan=2)
    my_form.set_widget(button_ok, (1, 5))
    # Calculate age from current time and Birtdate
    import shutil,os,datetime
    now =
    current_year  = now.strftime("%Y")
    current_month = now.strftime("%m")
    current_day   = now.strftime("%d")
    #current_time = now.strftime("%Y-%m-%d")
    years  = int(current_year) - var.byear
    months = int(current_month) - var.bmonth
    days   = int(current_day) - var.bday
    var.age= years + float(months)/12 + float(days)/365
    var.Bday = str(var.byear)+'.'+str(var.bmonth)+'.'+str(var.bday)
    print var.age, var.Bday
  • And for those who need an ID_code
    Info: use Bday and ID_code
    a) to check whether a participants participates twice in the same experiment
    b) or whether the same participant participated in two of your experiments

    def ID_code_validator():
        """Checks whether all fields have been filled out with one character"""
        #also checks for the number of characters
        return var.X1 != u'no' and var.X2 != u'' and var.X3 != u'' and var.X4 != u'' and len(str(var.X1))==1 and len(str(var.X2))==1 and len(str(var.X3))==1 and len(str(var.X4))==1
    ALPHA = []
    for i in range(65,91):
    alpha = []
    for i in range(97,123):
    list_alphabet = ALPHA + alpha + ['backspace']
    def filter_alphabet(ch):
        """Allows only alphabetic characters as input"""
        return ch in list_alphabet
    # Define all widgets
    button_ok = Button(text=u'Ok')
    label_father = Label(u'Please enter the first letter of your fathers surname')
    label_mother = Label(u'Please enter the first letter of your mothers surname')
    label_own = Label(u'Please enter the first letter of your own surname')
    label_bplace = Label(u'Please enter the first letter of your birthplace')
    # Specify a key filter so that only digits are accepted as text input
    input_father  = TextInput(stub=u'X …', var=u'X1', key_filter=filter_alphabet) 
    input_mother  = TextInput(stub=u'X …', var=u'X2', key_filter=filter_alphabet)
    input_own     = TextInput(stub=u'X …', var=u'X3', key_filter=filter_alphabet)
    input_bplace  = TextInput(stub=u'X …', var=u'X4', key_filter=filter_alphabet)
    # Build the form. Specify a validator function to make sure that the form is
    # completed.
    my_form = Form( validator=ID_code_validator, cols=4, rows=10, spacing=10, margins=(100, 100, 100, 100), )
    #my_form.set_widget(label_gender, (0, 0))
    my_form.set_widget(label_father, (0, 0), colspan=3)
    my_form.set_widget(input_father, (3, 0))
    my_form.set_widget(label_mother, (0, 2), colspan=3)
    my_form.set_widget(input_mother, (3, 2))
    my_form.set_widget(label_own,    (0, 4), colspan=3)
    my_form.set_widget(input_own,    (3, 4))
    my_form.set_widget(label_bplace, (0, 6), colspan=3)
    my_form.set_widget(input_bplace, (3, 6))
    my_form.set_widget(button_ok,    (3, 8))
    var.ID_code= var.X1 + var.X2 + var.X3 + var.X4
    print 'ID_CODE:', var.ID_code
  • Nice!

    Is there a way to change the fontsize?



  • I always work with these standard settings in the "general options":
    Foreground black
    Background white
    Font mono 18px

    With that it looks nice.

  • Apparently changing fontsize is doable:

    But for some reasons I struggle to do it, for instance:

    text_OK = "<span font-size = 12 >OK</span>"
    button_ok = Button(text=text_OK)

    doesnt seem to work.

  • Hey, really helpful advice!

    It doesn't seem like the form_text_input is supported if you want to make an online experiment. Do you have any advice of what to do then?


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