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 = 'PROVA'
    players_per_group = 3
    num_rounds = 1
    endowment = c(1000)
    multiplier = 2


class Subsession(BaseSubsession):
    pass


class Group(BaseGroup):
    total_contribution=models.CurrencyField()
    individual_share=models.CurrencyField()


class Player(BasePlayer):
   contribution = models.CurrencyField(e
       min=0
       max=Constants.endowment,
       label='How much will you contribute?'
   )