from otree.api import ( models, widgets, BaseConstants, BaseSubsession, BaseGroup, BasePlayer, Currency as c, currency_range, ) doc = """ This is a one-period public goods game with 3 players. """ class Constants(BaseConstants): name_in_url = 'public_goods' players_per_group = 29 num_rounds = 20 instructions_template = 'public_goods/instructions.html' # """Amount allocated to each player""" endowment = c(100) multiplier = 2 class Subsession(BaseSubsession): def vars_for_admin_report(self): contributions = [ p.contribution for p in self.get_players() if p.contribution != None ] if contributions: return dict( avg_contribution=sum(contributions) / len(contributions), min_contribution=min(contributions), max_contribution=max(contributions), ) else: return dict( avg_contribution='(no data)', min_contribution='(no data)', max_contribution='(no data)', ) class Group(BaseGroup): total_contribution = models.CurrencyField() individual_share = models.CurrencyField() def set_payoffs(self): self.total_contribution = sum([p.contribution for p in self.get_players()]) self.individual_share = ( self.total_contribution * C.MULTIPLIER / C.PLAYERS_PER_GROUP ) for p in self.get_players(): p.payoff = (C.ENDOWMENT - p.contribution) + self.individual_share def total_payoff(self): for p in self.get_players(): p.total_payoffs = sum([pp.payoff for pp in p.in_all_rounds()]) class Player(BasePlayer): total_payoffs = models.CurrencyField() contribution = models.CurrencyField( min=0, max=C.ENDOWMENT, doc="""The amount contributed by the player""" )