from otree.api import ( models, widgets, BaseConstants, BaseSubsession, BaseGroup, BasePlayer, Currency as c, currency_range, ) author = 'Your name here' doc = """ Your app description """ class Constants(BaseConstants): name_in_url = 'app1' players_per_group = None num_rounds = 1 treatments = ['a','b','c','d'] class Subsession(BaseSubsession): pass class Group(BaseGroup): pass class Player(BasePlayer): my_choice = models.StringField( choices=["Pro-Social", "Individualistic"] )