Setup UUID4 as the participant name

Coding
1

I have the following code to generate a UUID for each participant:
import uuid
uuid.uuid4()
print (“The random id is : “,end=””)
print (uuid.uuid4())

I would like to attach this ID to all the questionnaires the participant completes. I think if I add it as the participant name, that would work fine. So how do I code the UUID to be input into the following code for the participant name?

expInfo = {‘participant’: ‘id’, ‘session’: ‘001’}

I need the ‘id’ to be the UUID4 but it will not accept it. In this way, the participant number is coded randomly and stored with that participant’s data.

2

You need to assign the result of the uuid4() function to a variable so you can use it again (perhaps explicitly converting it to a string to avoid type problems). e.g.

id = str(uuid.uuid4())
expInfo = {'participant': id, 'session': '001'}

or if you don’t need to have a persistent reference to it (because it’s now stored in expInfo anyway), just assign it there directly:

expInfo = {'participant': str(uuid.uuid4()), 'session': '001'}
3

Dear Michael:

Thanks, that’s perfect. I’ll try it out.

4

Dear Michael:

  I am able to get the uuid to work in the Code view but I don't

know how to get it into the Builder View. So, every time I run
from Builder View, it overwrites the code. Is there a way to add
code to the Experiment Setting pop-up window?

5

You shouldn’t edit the generated script: as you know, it gets regenerated after each change. The way to use custom code within Builder is by inserting a code component from the “custom” component panel section:

https://www.psychopy.org/builder/components/code.html

Code set to run at the beginning of the experiment will run after the initial dialog box, so you should change it to just alter a single entry of expInfo, not to over-write the whole dictionary completely. e.g. something like:

expInfo['participant'] = str(uuid.uuid4())
6

Dear Michael:

  I did try that but the Participant id comes up blank every time.

I’m not sure why.

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