class criticalPath:

    def __init__(self):
        '''
        Initialize all the variables we're going to use to calculate the critical path
        '''
        self.id = None
        self.pred = tuple()
        self.dur = None
        self.est = None
        self.lst = None
        #list to store all the objects
        self.all_objects = list()

    def set_properties(self, name, predecessor, duration):
        self.id = name
        self.pred = tuple(predecessor)
        self.dur = duration


def main():
    #starting_nodes = list()
    object_list = list()

    A = criticalPath()
    A.set_properties('A', '0', 3)

    B = criticalPath()
    B.set_properties('B', '0', 6)

    C = criticalPath()
    C.set_properties('C', 'A', 12)

    D = criticalPath()
    D.set_properties('D', 'B', 4)



    tmp_list = list()
    tmp_list.append(A)
    tmp_list.append(B)
    object_list.append(tmp_list)

    tmp_list = list()
    tmp_list.append(C)
    tmp_list.append(D)
    object_list.append(tmp_list)

    '''for i in object_list:
        if '0' in i.pred:
            _list = list()
            _list.append(i)
            starting_nodes.append(_list)


    print(starting_nodes)'''
    print(max(object_list, key=sum(object_list.dur)))

if __name__ == '__main__': main()