import datetime

class Projecte:

    def __init__(self, nom):
        self.nom = nom
        self.__ltasques = []

    def afegir(self, tasca):
        self.__ltasques.append(tasca)
        
    def __getitem__(self, i):
        return self.__ltasques[i]

    def __len__(self):
        return len(self.__ltasques)

    def duracio(self):
        suma = datetime.timedelta(hours=0)
        for t in self.__ltasques:
            suma = suma + t.durada
        return suma