Missing 1 required positional argument

[Ryanauger95]

def addToAudience(email, fName, lName):
    try:
        response = mailchimp.lists.members.update('XXXXX', {
            'email_address': email,
            'status': 'subscribed',
            'data' : {},
            'merge_fields': {
                'FNAME': fName,
                'LNAME': lName,
                'data': {},
            }
        })
    except Exception as e:
        print("Exception:", e)

Exception: update() missing 1 required positional argument: 'data'

Is this an error from the mailchimp3 product or the Mailchimp API? Any idea how I could fix this?

[dfduarte]

Hello, any updates on this?

I just stumbled upon in the same error

[andylolz]

Your function is called addToAudience, so I think you’re trying to create a new list member. So instead of mailchimp.lists.members.update, you should be using mailchimp.lists.members.create.

If you instead want to update, you need to provide a subscriber hash as the second positional argument.