from otree.api import ( models, widgets, BaseConstants, BaseSubsession, BaseGroup, BasePlayer, Currency as c, currency_range ) import random doc = """ This is a two-period public goods game with 4 players. """ class Constants(BaseConstants): name_in_url = 'public_goods' players_per_group = 4 num_rounds = 10 instructions_template = 'public_goods/Instructions.html' # """Amount allocated to each player""" endowment = c(10) 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 { 'avg_contribution': sum(contributions)/len(contributions), 'min_contribution': min(contributions), 'max_contribution': max(contributions), } else: return { 'avg_contribution': '(no data)', 'min_contribution': '(no data)', 'max_contribution': '(no data)', } def creating_session(self): self.group_randomly(fixed_id_in_group=True) class Group(BaseGroup): total_contribution = models.CurrencyField() individual_share = models.CurrencyField() message = models.LongStringField(label='What message do you want to send to your employees?') suggested_amount = models.CurrencyField(min=0, max=Constants.endowment, label='Let us contribute:') def set_payoffs(self): self.total_contribution = sum([p.contribution for p in self.get_players()]) self.individual_share = self.total_contribution * Constants.multiplier / Constants.players_per_group for p in self.get_players(): p.payoff = (Constants.endowment - p.contribution) + self.individual_share class Player(BasePlayer): contribution = models.CurrencyField(min=0, max=Constants.endowment, label='How much will you contribute to the project (from 0 to 10)?') def role(self): if self.id_in_group == 1: return 'leader' else: return 'employee'