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 = 'bubble' players_per_group = 9 num_rounds = 15 cash = c(90) assets = 10 class Subsession(BaseSubsession): pass class Group(BaseGroup): pass class Player(BasePlayer): buy = models.CurrencyField() sell = models.CurrencyField()