运行Mesa示例模型时，出现“ NotImplementedError”

问题描述

我尝试从[mesa] [1]实现该教程。这是我从那里复制的代码，分别分成两个文件，money_model.py和server.py：

from mesa import Agent,Model
from mesa.time import RandomActivation
from mesa.space import MultiGrid
from mesa.visualization.modules import CanvasGrid
from mesa.visualization.ModularVisualization import ModularServer
class MoneyAgent(Agent):
    """ An agent with fixed initial wealth."""
    def __init__(self,unique_id,model):
        super().__init__(unique_id,model)
        self.wealth = 1

    def move(self):
        possible_steps = self.model.grid.get_neighborhood(
            self.pos,moore=True,include_center=False)
        new_position = self.random.choice(possible_steps)
        self.model.grid.move_agent(self,new_position)

    def give_money(self):
        cellmates = self.model.grid.get_cell_list_contents([self.pos])
        if len(cellmates) > 1:
            other_agent = self.random.choice(cellmates)
            other_agent.wealth += 1
            self.wealth -= 1

    def step(self):
        self.move()
        if self.wealth > 0:
            self.give_money()


class MoneyModel(Model):
    """A model with some number of agents."""
    def __init__(self,N,width,height):
        self.num_agents = N
        self.grid = MultiGrid(width,height,True)
        self.schedule = RandomActivation(self)
        # Create agents
        for i in range(self.num_agents):
            a = MoneyAgent(i,self)
            self.schedule.add(a)
            # Add the agent to a random grid cell
            x = self.random.randrange(self.grid.width)
            y = self.random.randrange(self.grid.height)
            self.grid.place_agent(a,(x,y))

    def step(self):
        self.schedule.step()

和

from money_model import *
from mesa.visualization.modules import CanvasGrid
from mesa.visualization.ModularVisualization import ModularServer


def agent_portrayal(agent):
    portrayal = {"Shape": "circle","Filled": "true","Layer": 0,"Color": "red","r": 0.5}
    return portrayal

grid = CanvasGrid(agent_portrayal,10,500,500)
server = ModularServer(MoneyModel,[grid],"Money Model",{"N":100,"width":10,"height":10})
server.port = 8521 # The default
server.launch()

当我运行示例时，它给了我以下错误：

Interface starting at http://127.0.0.1:8521
Traceback (most recent call last):
  File "c:/Users/fisch/Desktop/mesa example/server.py",line 20,in <module>
    server.launch()
  File "C:\Program Files\villos\lib\site-packages\mesa\visualization\ModularVisualization.py",line 333,in launch
    self.listen(self.port)
  File "C:\Program Files\villos\lib\site-packages\tornado\web.py",line 2116,in listen
    server.listen(port,address)
  File "C:\Program Files\villos\lib\site-packages\tornado\tcpserver.py",line 152,in listen
    self.add_sockets(sockets)
  File "C:\Program Files\villos\lib\site-packages\tornado\tcpserver.py",line 165,in add_sockets
    self._handlers[sock.fileno()] = add_accept_handler(
  File "C:\Program Files\villos\lib\site-packages\tornado\netutil.py",line 279,in add_accept_handler
    io_loop.add_handler(sock,accept_handler,IOLoop.READ)
  File "C:\Program Files\villos\lib\site-packages\tornado\platform\asyncio.py",line 100,in add_handler
    self.asyncio_loop.add_reader(fd,self._handle_events,fd,IOLoop.READ)
  File "C:\Program Files\villos\lib\asyncio\events.py",line 501,in add_reader
    raise NotImplementedError
NotImplementedError
    

当我在包含run.py文件的项目目录中运行当前正在使用“ mesa runserver”进行工作的项目时，也会发生这种情况。 我已经检查了环境变量，并且存在包含台面的路径。 有谁知道问题可能在哪里？ 谢谢！ [1]：https://mesa.readthedocs.io/en/master/tutorials/adv_tutorial.html

解决方法

我收到了“NotImplementedError”，因为我有一个过时的台面版本。

pip install mesa --upgrade

解决了这个问题。