python - 类型错误 - Python Simpy

Question

我已经在线搜索了许多与 TypeError 相关的答案，并多次扫描了我的代码，但我似乎看不到我缺少的第三个参数是什么。我正在使用 Python 2.7 和 Simpy 3

我的代码如下:

    import simpy
    import random

    RANDOM_SEED = 42
    NUM_SERVERS = 1
    MTBF = 10
    MTTR = 5
    TOTAL_ENGINES = 6
    TOTAL_SPARES = 3
    TOTAL_IN_USE = TOTAL_ENGINES - TOTAL_SPARES
    SIM_TIME = 100

    class Working(object):

        def __init__ (self, env, num, repair_facility, spares_inventory, downtime):
            self.env = env
            self.repair_facility = repair_facility
            self.spares_inventory = spares_inventory
            self.downtime = downtime
            self.name = 'Engine %d' % (num + 1)
            print('%s at %.2f' % (self.name, self.env.now))
            self.env.process(self.run())

        def run(self):
            yield self.env.timeout(random.expovariate(1.0 / MTBF))
            print('%s at %.2f' % (self.name, self.env.now))

            downtime_start = self.env.now
            spare = yield self.spares_inventory.get()
            self.downtime.append(self.env.now - downtime_start)

            print('%s at %.2f' % (spare.name, self.env.now))
            print('%d' % len(spares_inventory.items))

            with self.repair_facility.request() as req:
                yield req
                print('%s begins repair at %.2f' % (self.name, self.env.now))

                yield self.env.timeout(random.expovariate(1.0 / MTTR))

                yield self.spares_inventory.put(self)
                print('%s at %.2f' % (self.name, self.env.now))

            print('%d' % len(spares_inventory.items)) 

    def main():
        env = simpy.Environment()
        repair_facility = simpy.Resource(env, capacity = NUM_SERVERS)
        spares_inventory = simpy.Container(env, capacity = TOTAL_ENGINES, init = TOTAL_SPARES)
        downtime = []
        working = [Working(env, i, repair_facility, spares_inventory, downtime) for i in range(TOTAL_IN_USE)]

        env.run(SIM_TIME)   

    if __name__ == '__main__':
        main()

这是我不断收到的错误:

回溯(最近一次调用最后一次):

      File "", line 61, in <module>
        main()
      File "", line 55, in main
        env.run(SIM_TIME)
      File "", line 120, in run
        self.step()
      File "", line 213, in step
        raise event._value
      TypeError: __init__() takes exactly 3 arguments (2 given)

非常感谢任何帮助，提前非常感谢

Answer 1

您在回溯中忘记了一些额外信息；在您引用的回溯上方，有几行内容是:

Traceback (most recent call last):
  File "/data/evertr/sw/lib/python2.7/site-packages/simpy/events.py", line 312, in _resume
    event = self._generator.send(event._value)
  File "simptest.py", line 31, in run
    spare = yield self.spares_inventory.get()
TypeError: __init__() takes exactly 3 arguments (2 given)

The above exception was the direct cause of the following exception:

后面是您的回溯。

这样，您可以看到 self.spares_inventory.get()调用才是真正的罪魁祸首。令人烦恼的是，这个方法实际上是一个隐藏的类实例化(我注意到，在幕后发生了很多棘手的事情)，这就是为什么你会看到 __init__()警告。

基本上，您需要提供 amount至self.spares_inventory.get() (无论好坏，没有方便的默认值 1)。

所以将其更改为

spare = yield self.spares_inventory.get(1)

可以解决你的问题。

(不过之后您会遇到其他错误；您会发现的。这些新错误遵循相同的结构:回溯，后跟行 The above exception was the direct cause of the following exception ，然后是另一个(不太相关的)回溯)。